java初探(1)之秒杀项目总结

在开始总结之前,先记录一个刚看到的博客,编程规约。该博客记录了一些java开发上的规范,可以在编码的时候引入这些规范。

无论流行框架一直怎么改变,web开发中的三层架构一直属于理论的基础存在。

表现层 -> 业务层 -> 持久层

箭头所指的方向就是层之间调用的方向,在SSM框架中,利用springmvc来实现表现层,利用spring来实现业务层,用mybatis来实现持久层。

简单来说,一个web网站的开发,首先明确需求以后,要先设计与需求有关的各种数据表,针对秒杀案例,用户登录网站,查看秒杀商品,完成下单,因此,最基础的需要三个表:用户表、商品表、订单表

事实上,我们虽然做的秒杀功能,但不可能这个web只有一个秒杀的项目,而是一个商城,因此,为了便于维护我们的数据表,需要在抽象出以下两个表:秒杀商品表、秒杀订单表

 


用户表:

包括用户id、昵称、密码、密码混淆盐值、用户头像、注册日期、最近登录日期、登录次数。

(用户表可以尽可能详细的将用户的所有特征加入,如果系统庞大,也可以抽象出一些子表,但这里没必要,但如果在一些实际的网站,可以秒杀的用户和主用户表肯定是分开的,否则主用户表的字段会越来越多,难以维护)

CREATE TABLE `miaosha_user` (
`id` BIGINT(20) NOT NULL COMMENT '用户ID,手机号码',
`nickname` VARCHAR(255) NOT NULL,
`password` VARCHAR(32) DEFAULT NULL COMMENT 'MD5(MD5(pass明文+固定salt) + salt)',
`salt` VARCHAR(10) DEFAULT NULL,
`head` VARCHAR(128) DEFAULT NULL COMMENT '头像,云存储的ID',
`register_date` DATETIME DEFAULT NULL COMMENT '注册时间',
`last_login_date` DATETIME DEFAULT NULL COMMENT '上蔟登录时间',
`login_count` INT(11) DEFAULT '0' COMMENT '登录次数',
PRIMARY KEY (`id`)
) ENGINE=INNODB DEFAULT CHARSET=utf8mb4;

 


 

商品表:

包括商品ID、商品名称、商品标题、商品图片、商品的详细介绍、商品单价、商品库存

(商品表应着力于描述商品的具体特征,而不是添加秒杀的特性,理由也是为了维护系统的可用性)

CREATE TABLE `goods` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '商品ID',
  `goods_name` VARCHAR(16) DEFAULT NULL COMMENT '商品名称',
  `goods_title` VARCHAR(64) DEFAULT NULL COMMENT '商品标题',
  `goods_img` VARCHAR(64) DEFAULT NULL COMMENT '商品的图片',
  `goods_detail` LONGTEXT COMMENT '商品的详情介绍',
  `goods_price` DECIMAL(10,2) DEFAULT '0.00' COMMENT '商品单价',
  `goods_stock` INT(11) DEFAULT '0' COMMENT '商品库存,-1表示没有限制',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4;

 


 秒杀商品表 :

包括秒杀商品id、商品id、秒杀价、库存数、秒杀开始时间、秒杀结束时间

(抽象出来的秒杀商品表显然是商品表的子表,它可以拥有商品表的全部字段,但它有自己的价格,有自己的库存,增加了秒杀的时间限制,如果在商品表中增加字段,这无疑商品表会是个巨大无比的表)

CREATE TABLE `miaosha_goods` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '秒杀的商品表',
  `goods_id` BIGINT(20) DEFAULT NULL COMMENT '商品Id',
  `miaosha_price` DECIMAL(10,2) DEFAULT '0.00' COMMENT '秒杀价',
  `stock_count` INT(11) DEFAULT NULL COMMENT '库存数量',
  `start_date` DATETIME DEFAULT NULL COMMENT '秒杀开始时间',
  `end_date` DATETIME DEFAULT NULL COMMENT '秒杀结束时间',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4;

 


 

订单表

包括订单id、用户id、商品id、收货地址id、冗余过来的商品名称、订单上商品的数量、商品单价、订单的渠道、订单的状态、订单的创建时间、订单的支付时间

(这里有些字段是不需要的比如商品名称、商品单价。通过用户id和商品id就可以找到这些信息)

CREATE TABLE `order_info` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT,
  `user_id` BIGINT(20) DEFAULT NULL COMMENT '用户ID',
  `goods_id` BIGINT(20) DEFAULT NULL COMMENT '商品ID',
  `delivery_addr_id` BIGINT(20) DEFAULT NULL COMMENT '收获地址ID',
  `goods_name` VARCHAR(16) DEFAULT NULL COMMENT '冗余过来的商品名称',
  `goods_count` INT(11) DEFAULT '0' COMMENT '商品数量',
  `goods_price` DECIMAL(10,2) DEFAULT '0.00' COMMENT '商品单价',
  `order_channel` TINYINT(4) DEFAULT '0' COMMENT '1pc,2android,3ios',
  `status` TINYINT(4) DEFAULT '0' COMMENT '订单状态,0新建未支付,1已支付,2已发货,3已收货,4已退款,5已完成',
  `create_date` DATETIME DEFAULT NULL COMMENT '订单的创建时间',
  `pay_date` DATETIME DEFAULT NULL COMMENT '支付时间',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=1565 DEFAULT CHARSET=utf8mb4;

 


 

 秒杀订单表

包括秒杀订单表id、用户id、商品id、订单id

(根据这些id,可以得到具体的秒杀订单详情,其实这里可以有一个秒杀商品的id,根据该id来获取秒杀商品的价格)

CREATE TABLE `miaosha_order` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT,
  `user_id` BIGINT(20) DEFAULT NULL COMMENT '用户ID',
  `order_id` BIGINT(20) DEFAULT NULL COMMENT '订单ID',
  `goods_id` BIGINT(20) DEFAULT NULL COMMENT '商品ID',
  PRIMARY KEY (`id`),
  UNIQUE KEY `u_uid_gid` (`user_id`,`goods_id`) USING BTREE
) ENGINE=INNODB AUTO_INCREMENT=1551 DEFAULT CHARSET=utf8mb4;

 

 

以上就是数据库的设计。同时,有了该张数据库,我们可以更加的理清楚业务的逻辑:

用户登录页面:输入用户id和密码,传到服务器,通过查询用户表,来判断是否登录成功,成功跳转到商品的列表页面;

商品列表页面(这次项目不展示该页面):通过查询数据库,将所有商品展示在页面上。并提供一个秒杀商品列表页面的入口;

秒杀商品列表(此次项目当登录成功后直接跳转的页面):通过查询秒杀商品数据库,将所有秒杀的商品展示在页面上,并在每一个商品后面添加一个【详情】链接或按钮,点击直接跳转到秒杀商品的详情页。

秒杀商品详情页:将秒杀商品的信息展示出来,包括秒杀价、秒杀库存。秒杀的时间等,并提供一个立即秒杀的按钮,点击后执行秒杀逻辑,跳转到秒杀成功页面。

秒杀成功页面:显示秒杀成功后的订单详情,通过查询数据库,将订单的详情查出来显示。

 

对页面进行梳理之后,就可以创建出这四张页面,关于页面,为了前后端分离,建议使用纯html,但事实上,不可能做到完全的前后端分离,因此,用户登录页面和秒杀商品列表页面可以使用thymeleaf框架提供的标签模板, 而秒杀详情页和秒杀成功页面将采用纯html的方式辅助使用ajax请求的方式来完成数据的传递。

 


 

 用户登录页面


(登录页面由三部分组成,一部分是引入了thymeleaf模板,可以依照此规则,引入标签,获取参数,然后显示。一部分是纯的html标签和css样式,对布局样式进行规定,使页面更加美观。另一部分就是完成数据传递或者页面动态展示的js代码,更多的是ajax请求,以及数据处理。)

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>登录</title>

    <!-- jquery -->
    <script type="text/javascript" th:src="@{/js/jquery.min.js}"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" type="text/css" th:href="@{/bootstrap/css/bootstrap.min.css}" />
    <script type="text/javascript" th:src="@{/bootstrap/js/bootstrap.min.js}"></script>
    <!-- jquery-validator -->
    <script type="text/javascript" th:src="@{/jquery-validation/jquery.validate.min.js}"></script>
    <script type="text/javascript" th:src="@{/jquery-validation/localization/messages_zh.min.js}"></script>
    <!-- layer -->
    <script type="text/javascript" th:src="@{/layer/layer.js}"></script>
    <!-- md5.js -->
    <script type="text/javascript" th:src="@{/js/md5.min.js}"></script>
    <!-- common.js -->
    <script type="text/javascript" th:src="@{/js/common.js}"></script>

</head>
<body>


<form name="loginForm" id="loginForm" method="post"  style="width:50%; margin:0 auto">

    <h2 style="text-align:center; margin-bottom: 20px">用户登录</h2>

    <div class="form-group">
        <div class="row">
            <label class="form-label col-md-4">请输入手机号码</label>
            <div class="col-md-5">
                <input id="mobile" name = "mobile" class="form-control" type="text" placeholder="手机号码" required="true"  minlength="11" maxlength="11" />
            </div>
            <div class="col-md-1">
            </div>
        </div>
    </div>

    <div class="form-group">
        <div class="row">
            <label class="form-label col-md-4">请输入密码</label>
            <div class="col-md-5">
                <input id="password" name="password" class="form-control" type="password"  placeholder="密码" required="true" minlength="6" maxlength="16" />
            </div>
        </div>
    </div>

    <div class="row">
        <div class="col-md-5">
            <button class="btn btn-primary btn-block" type="reset" onclick="reset()">重置</button>
        </div>
        <div class="col-md-5">
            <button class="btn btn-primary btn-block" type="submit" onclick="login()">登录</button>
        </div>
    </div>

</form>
</body>

<script>
    function login(){
        $("#loginForm").validate({
            submitHandler:function(form){
                doLogin();
            }
        });
    }
    function doLogin(){
        g_showLoading();

        var inputPass = $("#password").val();
        var salt = g_passsword_salt;
        var str = ""+salt.charAt(0)+salt.charAt(2) + inputPass +salt.charAt(5) + salt.charAt(4);
        var password = md5(str);

        $.ajax({
            url: "/login/do_login",
            type: "POST",
            data:{
                mobile:$("#mobile").val(),
                password: password
            },
            success:function(data){
                layer.closeAll();
                if(data.code == 0){
                    layer.msg("成功");
                    window.location.href="/goods/to_list";
                }else{
                    layer.msg(data.msg);
                }
            },
            error:function(){
                layer.closeAll();
            }
        });
    }
</script>
</html>

 

 

页面分析:

该页面通过引入bootstrap模板,来规定页面的样式。

该页面通过引入thymeleaf模板,来对数据进行动态的展示。

该页面通过引入jQuery以及jQuery-validate模板,来使用各种js函数以及对输入数据进行基础验证。

 

note:

就内容而言,该页面只提供了一个form表单,然后提供了id和密码的输入框。通过对标签属性的设置,规定数据的验证规则。

对于js代码,主要是一个ajax请求。对于传送的数据,基于安全原则,不能在网络中传输明文密码,因此,需要将传递的密码值加密。

ajax请求规定了接收到数据响应后的操作。

 


 

 


 

秒杀商品列表页面:

(页面由于只有展示的业务,因此,只需要根据thymeleaf模板的标签,拿到返回值并在页面上做显示。出口只提供一个详情的页面跳转)

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>商品列表</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <!-- jquery -->
    <script type="text/javascript" th:src="@{/js/jquery.min.js}"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" type="text/css" th:href="@{/bootstrap/css/bootstrap.min.css}" />
    <script type="text/javascript" th:src="@{/bootstrap/js/bootstrap.min.js}"></script>
    <!-- jquery-validator -->
    <script type="text/javascript" th:src="@{/jquery-validation/jquery.validate.min.js}"></script>
    <script type="text/javascript" th:src="@{/jquery-validation/localization/messages_zh.min.js}"></script>
    <!-- layer -->
    <script type="text/javascript" th:src="@{/layer/layer.js}"></script>
    <!-- md5.js -->
    <script type="text/javascript" th:src="@{/js/md5.min.js}"></script>
    <!-- common.js -->
    <script type="text/javascript" th:src="@{/js/common.js}"></script>
</head>
<body>

<div class="panel panel-default">
    <div class="panel-heading">秒杀商品列表</div>
    <table class="table" id="goodslist">
        <tr><td>商品名称</td><td>商品图片</td><td>商品原价</td><td>秒杀价</td><td>库存数量</td><td>详情</td></tr>
        <tr  th:each="goods,goodsStat : ${goodsList}">
            <td th:text="${goods.goodsName}"></td>
            <td ><img th:src="@{${goods.goodsImg}}" width="100" height="100" /></td>
            <td th:text="${goods.goodsPrice}"></td>
            <td th:text="${goods.miaoshaPrice}"></td>
            <td th:text="${goods.stockCount}"></td>
            <td><a th:href="'/goods_detail.htm?goodsId='+${goods.id}">详情</a></td>
        </tr>
    </table>
</div>

</body>
</html>

 

 

note:

需要使用thymeleaf提供的命名空间,将页面显示出来。

详情页面由于使用静态页面,就不需要请求服务器然后跳转页面的方式了。而是直接跳转到秒杀商品的详情页面。

 


 


 

秒杀商品详情页面

java初探(1)之秒杀项目总结
<!DOCTYPE HTML>
<html >
<head>
    <title>商品详情</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <!-- jquery -->
    <script type="text/javascript" src="/js/jquery.min.js"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" type="text/css" href="/bootstrap/css/bootstrap.min.css" />
    <script type="text/javascript" src="/bootstrap/js/bootstrap.min.js"></script>
    <!-- jquery-validator -->
    <script type="text/javascript" src="/jquery-validation/jquery.validate.min.js"></script>
    <script type="text/javascript" src="/jquery-validation/localization/messages_zh.min.js"></script>
    <!-- layer -->
    <script type="text/javascript" src="/layer/layer.js"></script>
    <!-- md5.js -->
    <script type="text/javascript" src="/js/md5.min.js"></script>
    <!-- common.js -->
    <script type="text/javascript" src="/js/common.js"></script>
</head>
<body>

<div class="panel panel-default">
    <div class="panel-heading">秒杀商品详情</div>
    <div class="panel-body">
        <span id="userTip"> 您还没有登录,请登陆后再操作<br/></span>
        <span>没有收货地址的提示。。。</span>
    </div>
    <table class="table" id="goodslist">
        <tr>
            <td>商品名称</td>
            <td colspan="3" id="goodsName"></td>
        </tr>
        <tr>
            <td>商品图片</td>
            <td colspan="3"><img  id="goodsImg" width="200" height="200" /></td>
        </tr>
        <tr>
            <td>秒杀开始时间</td>
            <td id="startTime"></td>
            <td >
                <input type="hidden" id="remainSeconds" />
                <span id="miaoshaTip"></span>
            </td>
            <td>
                <!--
                    <form id="miaoshaForm" method="post" action="/miaosha/do_miaosha">
                        <button class="btn btn-primary btn-block" type="submit" id="buyButton">立即秒杀</button>
                        <input type="hidden" name="goodsId"  id="goodsId" />
                    </form>-->
                <div class="row">
                    <div class="form-inline">
                        <img id="verifyCodeImg" width="80" height="32"  style="display:none" onclick="refreshVerifyCode()"/>
                        <input id="verifyCode"  class="form-control" style="display:none"/>
                        <button class="btn btn-primary" type="button" id="buyButton" onclick="getMiaoshaPath()">立即秒杀</button>
                    </div>
                </div>
                <input type="hidden" name="goodsId"  id="goodsId" />
            </td>
        </tr>
        <tr>
            <td>商品原价</td>
            <td colspan="3" id="goodsPrice"></td>
        </tr>
        <tr>
            <td>秒杀价</td>
            <td colspan="3"  id="miaoshaPrice"></td>
        </tr>
        <tr>
            <td>库存数量</td>
            <td colspan="3"  id="stockCount"></td>
        </tr>
    </table>
</div>
</body>
</html>
<script>

    function getMiaoshaPath() {
        g_showLoading();

        //ajax请求
        $.ajax({
            url:"/miaosha/path",
            type:"GET",
            data:{
                goodsId:$("#goodsId").val(),
                verifyCode:$("#verifyCode").val()
            },
            success:function(data){
                if(data.code == 0){
                    var path = data.data;
                    doMiaosha(path);
                }else{
                    layer.msg(data.msg);
                }
            },
            error:function(){
                layer.msg("客户端请求有误");
            }
        });

    }

    
    function getMiaoshaResult(goodsId) {
        g_showLoading();//显示处理等待
        //发起ajax请求
        $.ajax({
            url:"/miaosha/result",
            type:"GET",
            data:{
                goodsId:$("#goodsId").val()
            },
            success:function(data){
                if (data.code==0){
                    var result=data.data;
                    if(result<0){
                        layer.msg("对不起,秒杀失败");
                    }else if(result==0){
                        //继续轮询
                        setTimeout(function () {
                            getMiaoshaResult(goodsId)
                        },50);
                    }
                    else {
                        layer.confirm("恭喜你,秒杀成功!查看订单?", {btn:["确定","取消"]},
                            function(){
                                window.location.href="/order_detail.htm?orderId="+result;
                            },
                            function(){
                                layer.closeAll();
                            });
                    }
                }else {
                    layer.msg(data.msg);
                }

            },
            error:function(){
                layer.msg("客户端请求有误");
            }
        });
    }

    function doMiaosha(path) {
        $.ajax({
            url:"/miaosha/"+path+"/do_miaosha",
            type:"POST",
            data:{
                goodsId:$("#goodsId").val(),
            },
            success:function(data){
                if(data.code == 0){
                    // window.location.href="/order_detail.htm?orderId="+data.data.id;
                    //code为0,说明秒杀请求已经入队,那么需要客户端发起对服务器的ajax请求,进行轮询。
                    getMiaoshaResult($("#goodsId").val());//这里将逻辑写成函数
                }else{
                    layer.msg(data.msg);
                }
            },
            error:function(){
                layer.msg("客户端请求有误");
            }
        });
    }

    $(function () {
        getDetail();
    });
    
    function getDetail() {
        //获取goodsId
        var goodsId=g_getQueryString("goodsId");

        //设置ajax请求,得到数据
        $.ajax({

            url:"/goods/to_detail/"+goodsId,
            type:"GET",
            success:function (data) {
                if(data.code==0){
                    //展示数据
                    render(data.data);
                }else{
                    //展示错误信息
                    layer.msg(data.msg);
                }
            },
            error:function () {
                //未请求成功信息
                layer.msg("客户端请求有误")
            }
        });
    }

    function render(detail) {
        //取到vo传过来的四个属性

        var miaoshaStatus = detail.miaoshaStatus;
        var  remainSeconds = detail.remainSeconds;
        var goods = detail.goods;
        var user = detail.user;

        //逻辑判断
        //如果用户存在,则隐藏需要登录的提醒
        if(user){
            $("#userTip").hide();
        }
        //展示数据
        $("#goodsName").text(goods.goodsName);
        $("#goodsImg").attr("src", goods.goodsImg);
        $("#startTime").text(new Date(goods.startDate).format("yyyy-MM-dd hh:mm:ss"));
        $("#remainSeconds").val(remainSeconds);
        $("#goodsId").val(goods.id);
        $("#goodsPrice").text(goods.goodsPrice);
        $("#miaoshaPrice").text(goods.miaoshaPrice);
        $("#stockCount").text(goods.stockCount);

        //引入倒计时
        countDown();

    }

    function countDown() {

        //获取剩余时间
        var remainSeconds = $("#remainSeconds").val();

        //定义超时变量
        var timeout;
        if(remainSeconds>0){
            //秒杀还没有开始
            //隐藏秒杀的按钮,展示倒计时提醒
            $("#buyButton").attr("disabled", true);
            $("#miaoshaTip").html("秒杀倒计时:"+remainSeconds+"秒");

            //利用setTimeout进行时间控制
            timeout=setTimeout(function () {

                //剩余秒数减一
                $("#countDown").text(remainSeconds - 1);
                $("#remainSeconds").val(remainSeconds - 1);
                countDown();//递归执行。
            },1000)//里面函数每执行一次,就延时一秒。
        }else if(remainSeconds==0){
            //秒杀正在进行
            //显示秒杀按钮
            $("#buyButton").attr("disabled", false);
            //清理设计的超时函数
            if(timeout){
                clearTimeout(timeout);
            }
            $("#miaoshaTip").html("秒杀进行中");
            //显示图片验证码
            //此图片需要请求服务器传回
            $("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val());
            $("#verifyCodeImg").show();
            $("#verifyCode").show();
        }else {
            //秒杀已经结束
            $("#buyButton").attr("disabled", true);
            $("#miaoshaTip").html("秒杀已经结束");
            //秒杀失败后隐藏
            $("#verifyCodeImg").hide();
            $("#verifyCode").hide();
        }
    }

    function refreshVerifyCode(){
        $("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val()+"&timestamp="+new Date().getTime());
    }
</script>
View Code

 

 

页面分析:

该页面比较复杂,主要包括,静态页面部分、秒杀商品详情数据的返回(ajax请求,由入口函数调用得到)、点击秒杀按钮触发的秒杀逻辑。

静态页面:显示用户登录信息、商品名称、图片、秒杀开始时间。价格、库存等基础信息的标签,并提供标签id,方便利用jQuery进行获取。当静态页面加载之后,就会被客户端(浏览器)缓存,以后请求如果页面不变,就不会想服务器请求调用静态资源。

数据返回:数据通过入口函数,调用一个ajax请求来返回数据。返回的数据包括所有需要显示的数据。,当调用成功后,通过js代码来控制数据如何显示,包括秒杀的倒计时。

秒杀事件触发:这里通过ajax请求,将逻辑交给服务器执行。(源代码通过几次ajax请求,申请随机地址,然后执行秒杀逻辑,得到秒杀结果,应该还有改进的空间)

 


 

秒杀成功页面

java初探(1)之秒杀项目总结
<!DOCTYPE HTML>
<html>
<head>
    <title>订单详情</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <!-- jquery -->
    <script type="text/javascript" src="/js/jquery.min.js"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" type="text/css" href="/bootstrap/css/bootstrap.min.css" />
    <script type="text/javascript" src="/bootstrap/js/bootstrap.min.js"></script>
    <!-- jquery-validator -->
    <script type="text/javascript" src="/jquery-validation/jquery.validate.min.js"></script>
    <script type="text/javascript" src="/jquery-validation/localization/messages_zh.min.js"></script>
    <!-- layer -->
    <script type="text/javascript" src="/layer/layer.js"></script>
    <!-- md5.js -->
    <script type="text/javascript" src="/js/md5.min.js"></script>
    <!-- common.js -->
    <script type="text/javascript" src="/js/common.js"></script>
</head>
<body>
<div class="panel panel-default">
    <div class="panel-heading">秒杀订单详情</div>
    <table class="table" id="goodslist">
        <tr>
            <td>商品名称</td>
            <td colspan="3" id="goodsName"></td>
        </tr>
        <tr>
            <td>商品图片</td>
            <td colspan="2"><img  id="goodsImg" width="200" height="200" /></td>
        </tr>
        <tr>
            <td>订单价格</td>
            <td colspan="2"  id="orderPrice"></td>
        </tr>
        <tr>
            <td>下单时间</td>
            <td id="createDate" colspan="2"></td>
        </tr>
        <tr>
            <td>订单状态</td>
            <td id="orderStatus">
            </td>
            <td>
                <button class="btn btn-primary btn-block" type="submit" id="payButton">立即支付</button>
            </td>
        </tr>
        <tr>
            <td>收货人</td>
            <td colspan="2">玉皇大帝</td>
        </tr>
        <tr>
            <td>收货地址</td>
            <td colspan="2">天宫一号</td>
        </tr>
    </table>
</div>
</body>
</html>
<script>
    //入口函数
    $(function () {
        getOrderDetail();
    })

    function getOrderDetail() {

        //一个ajax请求
        var orderId = g_getQueryString("orderId");
        $.ajax({
            url:"/order/detail",
            type:"GET",
            data:{
                orderId:orderId
            },
            success:function(data){
                if(data.code == 0){
                    //展示数据
                    render(data.data);
                }else{
                    layer.msg(data.msg);
                }
            },
            error:function(){
                layer.msg("客户端请求有误");
            }
        });

    }
function render(detail) {
    //获取商品和订单信息
    var goods = detail.goods;
    var order = detail.order;

    //对数据进行展示
    $("#goodsName").text(goods.goodsName);
    $("#goodsImg").attr("src", goods.goodsImg);
    $("#orderPrice").text(order.goodsPrice);
    $("#createDate").text(new Date(order.createDate).format("yyyy-MM-dd hh:mm:ss"));

    //对订单的状态进行判断

    var status = "";
    if(order.status == 0){
        status = "未支付"
    }else if(order.status == 1){
        status = "待发货";
        $("payButton").hide();
    }
    $("#orderStatus").text(status);

}


</script>
View Code

 

 

页面分析:

秒杀成功的页面比较简单,和上一页面类似,主要包括,静态页面部分、秒杀商品订单详情数据的返回(ajax请求,由入口函数调用得到)、点击支付按钮触发的支付逻辑。

由于没有做支付的业务逻辑,因此,此页面只有一个ajax请求来回去展示数据。


 

通过以上页面和数据库的创建和分析,其实已经大致摸清了整个秒杀项目的时序图:

登录页面 -> (ajax传数据) ->表现层(Controller)->返回数据 -> (跳转到商品列表的处理的类或者显示错误信息)

商品列表的处理类 -> 封装需要的数据 ->返回页面 -> 展示页面

(上述过程是一个时序,不需要用户进行输入或者点击)

点击详情 -> 跳转到商品详情页面(注意是页面,不是服务器控制类)-> 页面入口函数 -> ajax请求(获取页面需要展示的数据) ->返回数据,显示数据。

(上述过程是一个时序,不需要用户进行输入或者点击)

点击秒杀 -> 跳转获取秒杀路径 ->返回数据 ->跳转秒杀实际逻辑 ->返回数据 ->执行轮询请求判断是否秒杀成功 -> 秒杀成功跳转订单详情页。

 

梳理了以上时序图,可以在搭建完整的代码。

 


 

构建项目环境,使用springboot以及mybatis构建,maven自动导入项目坐标。


 


maven导入坐标的pom文件

java初探(1)之秒杀项目总结
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.8.RELEASE</version>
</parent>

  <name>miaosha_2</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.1</version>
    </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.5</version>
    </dependency>
    
    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
    </dependency>
    
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.38</version>
    </dependency>
    
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.6</version>
    </dependency>
    
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.6</version>
    </dependency>
    
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-validation</artifactId>
    </dependency>
    
    <dependency>  
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-amqp</artifactId>  
    </dependency>  
    
    <dependency>  
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-amqp</artifactId>  
    </dependency>

  </dependencies>
View Code

notes:

如果加载坐标太慢,可以建立私服,或者建立本地仓库。


 


创建配置文件application.properties

notes:可以暂时不用配置任何参数,用到什么框架配置什么内容。


 


 

创建包以及资源文件夹,并将静态资源引入

java初探(1)之秒杀项目总结

 

 

 

具体项目目录就如上图所示。

controller包表示表现层代码、service包表示业务层代码、dao包表示持久层代码、entity包表示实体类代码(domain与数据库传递的实体、bo与业务层传递的实体、vo与表现层传递的实体)、util包表示一些配置或者其他的工具类。

 

APP类是项目启动类

package com.miaosha;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class APP {

    public static void main(String[] args) {

        SpringApplication.run(APP.class);
    }
}

 


 


 

实现登录功能

所用技术:redis缓存、参数验证(自定义注解)、全局异常处理、返回数据抽象。

业务逻辑分析:

第一步,页面发起ajax请求,将数据传给服务器。服务器首先将数据进行参数验证,若参数不符合规则,直接返回错误信息。

第二步,若参数验证通过,将从缓存中取到用户数据,若缓存中没有数据,则从数据库中查询,然后存到缓存中。

第三步,将取到的用户数据与页面传递的数据比较,若错误,则返回错误信息,若正确,则返回正确信息。

以上是对业务的简单分析,但涉及到分布式,可能不同服务器之间没有共通的session,因此如果传到其他页面,user就会失效。因此需要考虑如何能获取到user的值。

同时,根据分析,可以知道,需要参数验证,如果每次在controller类中进行参数验证,势必会使系统很冗余,因此,采用注解的方式对参数进行验证。

还有就是返回值,返回值抽象出来管理,不同的控制器返回不同类型的值,有可能返回一个基本类型,有可能返回实体类,也有可能返回错误信息。

 

对结果集的封装

结果集是指返回结果,起码包含两部分,一部分是提示信息,一部分是真正的返回值,因此他是一个vo的实体类

该类还需要进一步抽象出一个专门存储错误消息的类,因为我们在返回过程中会有很多的消需要提醒。

分析:结果集需要哪些内容,一般来说,一个是数字提示的代码,一个是文字提示的消息,一个是真正需要返回的vo,result其实也是vo,是封装了的vo。

需要提供两个方法,业务正确时的success方法,业务出现错误时的error方法,如果业务正确,则代码和消息是固定的,但需要传递不同类型的数据;如果业务错误,则代码和消息不固定,但不需要传递数据。

因此抽象一个泛型的Result类来返回类,将代码和消息封装到CodeMsg类中,提供一系列静态实例。

java初探(1)之秒杀项目总结
package com.miaosha.entity.vo.result;

public class CodeMsg {

    private Integer code; //返回代码
    private String msg; //返回信息


    private CodeMsg( ) {
    }

    private CodeMsg( int code,String msg ) {
        this.code = code;
        this.msg = msg;
    }

    //通用的错误码
    public static CodeMsg SUCCESS = new CodeMsg(0, "success");
    public static CodeMsg SERVER_ERROR = new CodeMsg(500100, "服务端异常");
    public static CodeMsg BIND_ERROR = new CodeMsg(500101, "参数校验异常:%s");
    public static CodeMsg REQUEST_ILLEGAL = new CodeMsg(500102, "请求非法");
    public static CodeMsg ACCESS_LIMIT_REACHED= new CodeMsg(500104, "访问太频繁!");
    //登录模块 5002XX
    public static CodeMsg SESSION_ERROR = new CodeMsg(500210, "Session不存在或者已经失效");
    public static CodeMsg PASSWORD_EMPTY = new CodeMsg(500211, "登录密码不能为空");
    public static CodeMsg MOBILE_EMPTY = new CodeMsg(500212, "手机号不能为空");
    public static CodeMsg MOBILE_ERROR = new CodeMsg(500213, "手机号格式错误");
    public static CodeMsg MOBILE_NOT_EXIST = new CodeMsg(500214, "手机号不存在");
    public static CodeMsg PASSWORD_ERROR = new CodeMsg(500215, "密码错误");


    //商品模块 5003XX


    //订单模块 5004XX
    public static CodeMsg ORDER_NOT_EXIST = new CodeMsg(500400, "订单不存在");

    //秒杀模块 5005XX
    public static CodeMsg MIAO_SHA_OVER = new CodeMsg(500500, "商品已经秒杀完毕");
    public static CodeMsg REPEATE_MIAOSHA = new CodeMsg(500501, "不能重复秒杀");
    public static CodeMsg MIAOSHA_FAIL = new CodeMsg(500502, "秒杀失败");



    public Integer getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
}
CodeMsg java初探(1)之秒杀项目总结
package com.miaosha.entity.vo.result;

public class Result <T> {

    private Integer code; //返回代码
    private String msg; //返回信息
    private T date;//返回实体


    private Result(CodeMsg codeMsg){

        if(codeMsg!=null) {
            this.code = codeMsg.getCode();
            this.msg = codeMsg.getMsg();
            this.date=null;
        }

    }

    private Result(T date){
        this.code=0;
        this.msg="success";
        this.date=date;
    }

    public static <T> Result<T> success(T date){
        return new Result<T> (date);
    }

    public static <T> Result<T> error(CodeMsg codeMsg){

        return new Result<T>(codeMsg);
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        msg = msg;
    }

    public T getDate() {
        return date;
    }

    public void setDate(T date) {
        this.date = date;
    }
}
Result

这种封装能极大的提供代码的可用性,扩展性。

 

对登录信息实体类的封装

对于登录信息传递过来的值,显然用不到用户表中的那么多字段,只需要得到两个字段,一个用户id,一个用户密码。而且该类需要和表现层交互,因此也是在vo包创建

java初探(1)之秒杀项目总结
package com.miaosha.entity.vo;

public class LoginVO {

    private Long mobile;

    private String password;
    

    public Long getMobile() {
        return mobile;
    }

    public void setMobile(Long mobile) {
        this.mobile = mobile;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}
LoginVO

该类的属性名需要和页面上手机号码和密码的name属性一致(这样做是为了让springboot能自动识别bean)

 

实现验证功能

当页面将数据传到Controller类后,需要对登录数据的格式进行验证(是否为空,长度是否正确,格式是否正确。。。)

使用JSR-303标准的验证形式,在jdk1.8中支持这样的验证。

步骤1:在LoginVO(即待验证的属性上加上需要验证的注解项,@NotNull。。。)

java初探(1)之秒杀项目总结
package com.miaosha.entity.vo;

import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.NotNull;

public class LoginVO {

    @NotNull
    private Long mobile;

    @NotNull
    @Length(min = 32)
    private String password;


    public Long getMobile() {
        return mobile;
    }

    public void setMobile(Long mobile) {
        this.mobile = mobile;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}
LoginVO

步骤2:在LoginController类的doLogin方法的参数LoginVo前加上@Valid注解。

java初探(1)之秒杀项目总结
package com.miaosha.controller;

import com.miaosha.entity.vo.LoginVO;
import com.miaosha.entity.vo.result.Result;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.validation.Valid;

@Controller
@RequestMapping("/login")
public class LoginController {

    //去登录页面
    @RequestMapping("/to_login")
    public String toLogin(){

        return "login";

    }

    //执行登录
    @RequestMapping("/do_login")
    @ResponseBody
    public Result<Boolean> doLogin(@Valid LoginVO loginVO){


        return Result.success(true);

    }

}
LoginController

验证原理:让注解的逻辑类实现ConstraintValidator接口的方法,确定是否验证通过,验证通过返回true,没有通过返回false,当没有通过后,会抛出一个BindException类型的异常,异常信息就是注解中默认的信息。

 

自定义验证注解

根据对验证原理的分析,可以通过本身的业务需求自定义一个验证的注解——@IsMobile

步骤1:定义一个IsMobile注解,并继承Constraint注解,来指定一个继承了ConstraintValidator接口的逻辑类。

java初探(1)之秒杀项目总结
package com.miaosha.util.valid;


import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = {IsMobileValidator.class })
public @interface IsMobile {

    boolean required() default true;

    String message() default "手机号码格式错误";

    Class<?>[] groups() default { };

    Class<? extends Payload>[] payload() default { };

}
IsMobile

步骤2:实现该注解的逻辑类

在初始方法中,将请求初始化为默认的请求。

在验证逻辑判断方法中,如果验证成功,返回true,若验证失败则返回false。

java初探(1)之秒杀项目总结
package com.miaosha.util.valid;

import com.miaosha.util.valid.IsMobile;
import org.apache.commons.lang3.StringUtils;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class IsMobileValidator implements ConstraintValidator<IsMobile, String> {

    private boolean required = false;

    @Override
    public void initialize(IsMobile isMobile) {
        required = isMobile.required();
    }

    @Override
    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {
        if(required) {
            return ValidatorUtil.isMobile(s);
        }else {
            if(StringUtils.isEmpty(s)) {
                return true;
            }else {
                return ValidatorUtil.isMobile(s);
            }
        }
    }
}
IsMobileValidator java初探(1)之秒杀项目总结
package com.miaosha.util.valid;

import org.apache.commons.lang3.StringUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ValidatorUtil {


    private static final Pattern mobile_pattern = Pattern.compile("1\\d{10}");

    public static boolean isMobile(String src) {
        if(StringUtils.isEmpty(src)) {
            return false;
        }
        Matcher m = mobile_pattern.matcher(src);
        return m.matches();
    }
}
ValidatorUtil

查看页面返回结果:

{"timestamp":1582541833111,"status":400,"error":"Bad Request","exception":"org.springframework.validation.BindException","errors":[{"codes":["IsMobile.loginVO.mobile","IsMobile.mobile","IsMobile.java.lang.String","IsMobile"],"arguments":[{"codes":["loginVO.mobile","mobile"],"arguments":null,"defaultMessage":"mobile","code":"mobile"},true],"defaultMessage":"手机号码格式错误","objectName":"loginVO","field":"mobile","rejectedValue":"23588038176","bindingFailure":false,"code":"IsMobile"}],"message":"Validation failed for object='loginVO'. Error count: 1","path":"/login/do_login"}

确实可以看到返回了我们需要的默认错误消息。只不过我们不需要这样的返回规则,那么需要一个统一处理异常的类,来对异常做统一的返回类型处理。

 

异常统一处理

springboot提供了可以统一处理异常的机制,但在此之前,我们需要自定义一个全局异常类,该类用于返回各种我们人为抛出的业务逻辑异常。比如用户不存在,密码错误等信息。

步骤1:创建全局异常类,提供自定义异常信息的方法

java初探(1)之秒杀项目总结
package com.miaosha.util.exception;

import com.miaosha.entity.vo.result.CodeMsg;

public class GlobalException extends RuntimeException {

    private CodeMsg cm;

    public GlobalException(CodeMsg cm){
        super(cm.toString());
        this.cm=cm;
    }

    public CodeMsg getCm() {
        return cm;
    }
}
GlobalException

步骤2:对异常进行统一管理,具体就是将各种异常规则化为之前定义的Result返回。根据的是springboot提供的ControllerAdvice注解和ExceptionHandler注解

java初探(1)之秒杀项目总结
package com.miaosha.util.exception;


import com.miaosha.entity.vo.result.CodeMsg;
import com.miaosha.entity.vo.result.Result;
import org.springframework.validation.BindException;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import java.util.List;

@ControllerAdvice
@ResponseBody
public class GlobalExceptionHandler {

    @ExceptionHandler(value=Exception.class)
    public Result<String> exceptionHandler(HttpServletRequest request, Exception e){
        e.printStackTrace();
        if(e instanceof GlobalException) {
            GlobalException ex = (GlobalException)e;
            return Result.error(ex.getCm());
        }else if(e instanceof BindException) {
            BindException ex = (BindException)e;
            List<ObjectError> errors = ex.getAllErrors();
            ObjectError error = errors.get(0);
            String msg = error.getDefaultMessage();
            return Result.error(CodeMsg.BIND_ERROR.fillArgs(msg));
        }else {
            return Result.error(CodeMsg.SERVER_ERROR);
        }
    }


}
GlobalExceptionHandler

这里的ControllerAdvice注解会在启动的时候加加载初始化bean,将GlobalExceptionHandler类扫描进包,然后通过ExceptionHandler注解对异常统一管理

参考博客

返回结果如下:

{"code":500101,"msg":"参数校验异常:手机号码格式错误","date":null}

 

redis缓存技术

jedis类似于jdbc是一个redis的操作api,如果要用redis技术,需要对jedis进行一定的配置,并最后能封装一个service方法来调用jedis。

步骤1:对jedis进行配置,先在application.properties配置文件中引入配置信息,然后通过ConfigurationProperties注解,对配置信息进行解析,得到所有的配置参数,包括redis的主机号和端口等

#redis
redis.host=10.110.3.62
redis.port=6379
redis.timeout=10
redis.password=123456
redis.poolMaxTotal=1000
redis.poolMaxIdle=500
redis.poolMaxWait=500

步骤二:解析配置文件,得到将这些配置信息转换为属性,方便操作。

java初探(1)之秒杀项目总结
package com.miaosha.util.redisconfig;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "redis")
public class RedisConfig {

    private String host;
    private int port;
    private int timeout;//秒
    private String password;
    private int poolMaxTotal;
    private int poolMaxIdle;
    private int poolMaxWait;//秒

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    public int getTimeout() {
        return timeout;
    }

    public void setTimeout(int timeout) {
        this.timeout = timeout;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getPoolMaxTotal() {
        return poolMaxTotal;
    }

    public void setPoolMaxTotal(int poolMaxTotal) {
        this.poolMaxTotal = poolMaxTotal;
    }

    public int getPoolMaxIdle() {
        return poolMaxIdle;
    }

    public void setPoolMaxIdle(int poolMaxIdle) {
        this.poolMaxIdle = poolMaxIdle;
    }

    public int getPoolMaxWait() {
        return poolMaxWait;
    }

    public void setPoolMaxWait(int poolMaxWait) {
        this.poolMaxWait = poolMaxWait;
    }
}
RedisConfig

步骤三:封装一个可以获取redis池对象的方法,这是一个工厂类,类似于工厂模式,得到了JedisPook对象

java初探(1)之秒杀项目总结
package com.miaosha.util.redisconfig;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

@Component
public class RedisPoolFactory {

    @Autowired
    private RedisConfig redisConfig;

    @Bean
    public JedisPool JedisPoolFactory(){
        JedisPoolConfig jedisPoolConfig=new JedisPoolConfig();
        jedisPoolConfig.setMaxWaitMillis(redisConfig.getPoolMaxWait());
        jedisPoolConfig.setMaxTotal(redisConfig.getPoolMaxTotal());
        jedisPoolConfig.setMaxIdle(redisConfig.getPoolMaxIdle());

        JedisPool jedisPool=new JedisPool(jedisPoolConfig,redisConfig.getHost(),redisConfig.getPort(),redisConfig.getTimeout() *1000,null,0);
        return jedisPool;
    }

}
RedisPoolFactory

步骤四:根据这样的池对象封装一些操作的方法供缓存使用,之后就可以像类似于redisTemplate对象一样了。因此,将其命名为MyResidTemplate类

java初探(1)之秒杀项目总结
package com.miaosha.util.redisconfig;

import java.util.ArrayList;
import java.util.List;

import com.miaosha.util.redisconfig.key.KeyPrefix;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.alibaba.fastjson.JSON;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.ScanParams;
import redis.clients.jedis.ScanResult;

@Service
public class MyRedisTemplate {

    @Autowired
    private JedisPool jedisPool;

    /**
     * 获取当个对象
     * */
    public <T> T get(KeyPrefix prefix, String key, Class<T> clazz) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            String  str = jedis.get(realKey);
            T t =  stringToBean(str, clazz);
            return t;
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 设置对象
     * */
    public <T> boolean set(KeyPrefix prefix, String key,  T value) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            String str = beanToString(value);
            if(str == null || str.length() <= 0) {
                return false;
            }
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            int seconds =  prefix.expireSeconds();
            if(seconds <= 0) {
                jedis.set(realKey, str);
            }else {
                jedis.setex(realKey, seconds, str);
            }
            return true;
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 判断key是否存在
     * */
    public <T> boolean exists(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.exists(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 删除
     * */
    public boolean delete(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            long ret =  jedis.del(realKey);
            return ret > 0;
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 增加值
     * */
    public <T> Long incr(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.incr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 减少值
     * */
    public <T> Long decr(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.decr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    public boolean delete(KeyPrefix prefix) {
        if(prefix == null) {
            return false;
        }
        List<String> keys = scanKeys(prefix.getPrefix());
        if(keys==null || keys.size() <= 0) {
            return true;
        }
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            jedis.del(keys.toArray(new String[0]));
            return true;
        } catch (final Exception e) {
            e.printStackTrace();
            return false;
        } finally {
            if(jedis != null) {
                jedis.close();
            }
        }
    }

    public List<String> scanKeys(String key) {
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            List<String> keys = new ArrayList<String>();
            String cursor = "0";
            ScanParams sp = new ScanParams();
            sp.match("*"+key+"*");
            sp.count(100);
            do{
                ScanResult<String> ret = jedis.scan(cursor, sp);
                List<String> result = ret.getResult();
                if(result!=null && result.size() > 0){
                    keys.addAll(result);
                }
                //再处理cursor
                cursor = ret.getStringCursor();
            }while(!cursor.equals("0"));
            return keys;
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    public static <T> String beanToString(T value) {
        if(value == null) {
            return null;
        }
        Class<?> clazz = value.getClass();
        if(clazz == int.class || clazz == Integer.class) {
            return ""+value;
        }else if(clazz == String.class) {
            return (String)value;
        }else if(clazz == long.class || clazz == Long.class) {
            return ""+value;
        }else {
            return JSON.toJSONString(value);
        }
    }

    @SuppressWarnings("unchecked")
    public static <T> T stringToBean(String str, Class<T> clazz) {
        if(str == null || str.length() <= 0 || clazz == null) {
            return null;
        }
        if(clazz == int.class || clazz == Integer.class) {
            return (T)Integer.valueOf(str);
        }else if(clazz == String.class) {
            return (T)str;
        }else if(clazz == long.class || clazz == Long.class) {
            return  (T)Long.valueOf(str);
        }else {
            return JSON.toJavaObject(JSON.parseObject(str), clazz);
        }
    }

    private void returnToPool(Jedis jedis) {
        if(jedis != null) {
            jedis.close();
        }
    }
}
MyRedisTemplate

该类中实现了jedis操作缓存的若干方法,包括向缓存中存入对象(泛型)、取出对象、判断key值是否存在、删除对象、自增、自减、获取所有key。

 

但在此之前,需要抽象一个有关key的类,redis缓存技术是基于key-value格式去缓存的,而对于一个项目而言,key值有很多个,因此,需要通过接口 -> 抽象类 ->实体类的方式,对key值进行扩展。一个key值包括,一个前缀和一个真正的key值名称,同时还需要包括这个key值在redis中的存活时间。

接口 -> 抽象类 -> 实现类

步骤1:抽象一个接口,提供两个方法,一个是过期时间,一个是key的前缀

java初探(1)之秒杀项目总结
package com.miaosha.util.redisconfig.key;

public interface KeyPrefix {

    int expireSeconds();
    String getPrefix();
}
KeyPrefix

步骤2:继承接口的抽象类

java初探(1)之秒杀项目总结
package com.miaosha.util.redisconfig.key;

public class BasePrefix implements KeyPrefix {


    private int expireSeconds;

    private String prefix;

    public BasePrefix(String prefix) {//0代表永不过期
        this(0, prefix);
    }

    public BasePrefix( int expireSeconds, String prefix) {
        this.expireSeconds = expireSeconds;
        this.prefix = prefix;
    }

    public int expireSeconds() {//默认0代表永不过期
        return expireSeconds;
    }

    public String getPrefix() {
        String className = getClass().getSimpleName();
        return className+":" + prefix;
    }
}
BasePrefix

步骤3:实现抽象类

//该类在具体用到的时候进行抽象。

 

登录逻辑

登录逻辑分析:

步骤1:得到页面传过来的mobile、password。并根据mobile值从缓存中去找user是否存在。

步骤2:若缓存中有user,则执行下一步,比较密码是否一致。若缓存中没有user,则需要从数据库中找,如果找到,则执行下一步,比较密码是否一致。若也不存在,则抛出全局异常。

步骤3:验证密码,密码在页面传过来时已经经过md5加密,而且数据库中所存的密码是执行了两个md5的结果,因此,对密码应该进行一次md5加密才能进行比较,若密码相同,则说明信息正确,若不相同,抛出异常。

步骤4:若密码相同,说明登录成功,则需要向页面传回一个cookie值,将cookie值存在页面上,保证跳转到其他服务器中,session值已经过期的情况下,也可以在其他页面拿到现在得到的user值,因此,该cookie值应当对应于缓存中的一个key值,即需要在缓存中存入一个key值为cookie值的user。

步骤5:返回成功信息。

密码工具类:

java初探(1)之秒杀项目总结
package com.miaosha.util;

import org.apache.commons.codec.digest.DigestUtils;

public class MD5Util {

    public static String md5(String src) {
        return DigestUtils.md5Hex(src);
    }

    private static final String salt = "1a2b3c4d";

    public static String inputPassToFormPass(String inputPass) {
        String str = ""+salt.charAt(0)+salt.charAt(2) + inputPass +salt.charAt(5) + salt.charAt(4);
        System.out.println(str);
        return md5(str);
    }

    public static String formPassToDBPass(String formPass, String salt) {
        String str = ""+salt.charAt(0)+salt.charAt(2) + formPass +salt.charAt(5) + salt.charAt(4);
        return md5(str);
    }

    public static String inputPassToDbPass(String inputPass, String saltDB) {
        String formPass = inputPassToFormPass(inputPass);
        String dbPass = formPassToDBPass(formPass, saltDB);
        return dbPass;
    }
}
MD5Util

随机COOKIE工具类:

java初探(1)之秒杀项目总结
package com.miaosha.util;

import java.util.UUID;

public class UUIDUtil {

    public static String uuid() {
        return UUID.randomUUID().toString().replace("-", "");
    }
}
UUIDUtil

登录的控制类

java初探(1)之秒杀项目总结
package com.miaosha.controller;

import com.miaosha.entity.vo.LoginVO;
import com.miaosha.entity.vo.result.Result;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.validation.Valid;

@Controller
@RequestMapping("/login")
public class LoginController {

    private static Logger log = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    MiaoshaUserService userService;
    //去登录页面
    @RequestMapping("/to_login")
    public String toLogin(){

        return "login";

    }

    //执行登录
    @RequestMapping("/do_login")
    @ResponseBody
    public Result<String> doLogin(@Valid LoginVO loginVO){

        log.info(loginVO.toString());
        //登录
        String token = userService.login(response, loginVo);
        return Result.success(token);

    }

}
LoginController

属性加入MiaoshaUserService类来提供登录验证的具体方法,这里登录验证的逻辑无言多说,但对于加入cookie的方法,其作用是,在登录后,可以在客户端存一份cookie值,当跳转到其他页面后,有可能服务器的seeison值因为分布式系统而取不到用户,因此可以通过客户端存的cookie值去缓存中取。

用户登录的业务类

java初探(1)之秒杀项目总结
package com.miaosha.service;

import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.vo.LoginVO;
import com.miaosha.entity.vo.result.CodeMsg;
import com.miaosha.util.MD5Util;
import com.miaosha.util.UUIDUtil;
import com.miaosha.util.exception.GlobalException;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import com.miaosha.util.redisconfig.key.MiaoshaUserKey;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;

@Service
public class MiaoshaUserService {

    public static final String COOKI_NAME_TOKEN = "token";

    @Autowired
    MiaoshaUserDao miaoshaUserDao;

    @Autowired
    MyRedisTemplate redisService;

    public MiaoshaUser getById(long id) {
        //取缓存
        MiaoshaUser user = redisService.get(MiaoshaUserKey.getById, ""+id, MiaoshaUser.class);
        if(user != null) {
            return user;
        }
        //取数据库
        user = miaoshaUserDao.getById(id);
        if(user != null) {
            redisService.set(MiaoshaUserKey.getById, ""+id, user);
        }
        return user;
    }
    // http://blog.csdn.net/tTU1EvLDeLFq5btqiK/article/details/78693323
    public boolean updatePassword(String token, long id, String formPass) {
        //取user
        MiaoshaUser user = getById(id);
        if(user == null) {
            throw new GlobalException(CodeMsg.MOBILE_NOT_EXIST);
        }
        //更新数据库
        MiaoshaUser toBeUpdate = new MiaoshaUser();
        toBeUpdate.setId(id);
        toBeUpdate.setPassword(MD5Util.formPassToDBPass(formPass, user.getSalt()));
        miaoshaUserDao.update(toBeUpdate);
        //处理缓存
        redisService.delete(MiaoshaUserKey.getById, ""+id);
        user.setPassword(toBeUpdate.getPassword());
        redisService.set(MiaoshaUserKey.token, token, user);
        return true;
    }


    public MiaoshaUser getByToken(HttpServletResponse response, String token) {
        if(StringUtils.isEmpty(token)) {
            return null;
        }
        MiaoshaUser user = redisService.get(MiaoshaUserKey.token, token, MiaoshaUser.class);
        //延长有效期
        if(user != null) {
            addCookie(response, token, user);
        }
        return user;
    }


    public String login(HttpServletResponse response, LoginVO loginVo) {
        if(loginVo == null) {
            throw new GlobalException(CodeMsg.SERVER_ERROR);
        }
        String mobile = loginVo.getMobile();
        String formPass = loginVo.getPassword();
        //判断手机号是否存在
        MiaoshaUser user = getById(Long.parseLong(mobile));
        if(user == null) {
            throw new GlobalException(CodeMsg.MOBILE_NOT_EXIST);
        }
        //验证密码
        String dbPass = user.getPassword();
        String saltDB = user.getSalt();
        String calcPass = MD5Util.formPassToDBPass(formPass, saltDB);
        if(!calcPass.equals(dbPass)) {
            throw new GlobalException(CodeMsg.PASSWORD_ERROR);
        }
        //生成cookie
        String token     = UUIDUtil.uuid();
        addCookie(response, token, user);
        return token;
    }

    private void addCookie(HttpServletResponse response, String token, MiaoshaUser user) {
        redisService.set(MiaoshaUserKey.token, token, user);
        Cookie cookie = new Cookie(COOKI_NAME_TOKEN, token);
        cookie.setMaxAge(MiaoshaUserKey.token.expireSeconds());
        cookie.setPath("/");
        response.addCookie(cookie);
    }
}
MiaoshaUserService

用户的查询数据库的类

java初探(1)之秒杀项目总结
package com.miaosha.service;

import com.miaosha.entity.domain.MiaoshaUser;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

@Mapper
public interface MiaoshaUserDao {
    

        @Select("select * from miaosha_user where id = #{id}")
        public MiaoshaUser getById(@Param("id")long id);

        @Update("update miaosha_user set password = #{password} where id = #{id}")
        public void update(MiaoshaUser toBeUpdate);
}
MiaoshaUserDao

 

以上就是登录功能的实现,可以说我们在前期做了很多的工作,使用了很多的技术,其实就是为了在后面编程的过程中很好继续下去,这种代码的可用性很高。

 


  •  

 秒杀功能的实现

所用的技术:页面静态化、缓存技术、RabbitMQ技术、路径隐藏、内存标记。。。

业务逻辑的分析:

第一步:登录成功后,请求服务器去返回商品列表页面,将使用thymeleaf技术将页面和数据进行交互,展示商品页面。

第二步:点击详情页面,跳转到商品的详情页面,此次跳转不经过服务器,实现页面的静态化。跳转之后,在入口函数调用ajax请求,请求返回页面展示需要的数据。

第三步:请求展示的数据有验证码的数据,但不需要返回,是通过读取内存得到的,对验证码图片进行显示。

第四步:输入验证码,并点击秒杀按钮,获取秒杀的请求服务器路径,返回路径后,请求服务器的执行秒杀功能的请求。

第五步:判断是否库存足够,并判断是否已经下单,然后将用户和商品id放入rabbitMQ队列中,等到队列出队。

第六步:队列出队执行秒杀的逻辑,减库存。下订单。

第七步:在浏览器中的返回成功逻辑中不停的请求服务器,判断是否下订单成功,如果成功,则跳转到订单详情页面。

第八步:订单详情页面的入口函数请求服务器,返回展示页面的数据。

 

各类实体类

首先domian包里的类要与数据库的相关联,回顾前面的数据库表,商品表、秒杀商品表、订单表、秒杀订单表。那么对应的domain的实体类应该有Goods、MiaoshaGoods、OrderInfo、MiaoshaOrder。

这一类的实体类很好创建,只要其属性和数据库字段一一对应,然后添加相应的getset方法。

java初探(1)之秒杀项目总结
package com.miaosha.entity.domain;

public class Goods {

    private Long id;
    private String goodsName;
    private String goodsTitle;
    private String goodsImg;
    private String goodsDetail;
    private Double goodsPrice;
    private Integer goodsStock;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getGoodsName() {
        return goodsName;
    }

    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }

    public String getGoodsTitle() {
        return goodsTitle;
    }

    public void setGoodsTitle(String goodsTitle) {
        this.goodsTitle = goodsTitle;
    }

    public String getGoodsImg() {
        return goodsImg;
    }

    public void setGoodsImg(String goodsImg) {
        this.goodsImg = goodsImg;
    }

    public String getGoodsDetail() {
        return goodsDetail;
    }

    public void setGoodsDetail(String goodsDetail) {
        this.goodsDetail = goodsDetail;
    }

    public Double getGoodsPrice() {
        return goodsPrice;
    }

    public void setGoodsPrice(Double goodsPrice) {
        this.goodsPrice = goodsPrice;
    }

    public Integer getGoodsStock() {
        return goodsStock;
    }

    public void setGoodsStock(Integer goodsStock) {
        this.goodsStock = goodsStock;
    }
}
Goods java初探(1)之秒杀项目总结
package com.miaosha.entity.domain;

import java.util.Date;

public class MiaoshaGoods {

    private Long id;
    private Long goodsId;
    private Integer stockCount;
    private Date startDate;
    private Date endDate;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(Long goodsId) {
        this.goodsId = goodsId;
    }

    public Integer getStockCount() {
        return stockCount;
    }

    public void setStockCount(Integer stockCount) {
        this.stockCount = stockCount;
    }

    public Date getStartDate() {
        return startDate;
    }

    public void setStartDate(Date startDate) {
        this.startDate = startDate;
    }

    public Date getEndDate() {
        return endDate;
    }

    public void setEndDate(Date endDate) {
        this.endDate = endDate;
    }
}
MiaoshaGoods java初探(1)之秒杀项目总结
package com.miaosha.entity.domain;

import java.util.Date;

public class OrderInfo {

    private Long id;
    private Long userId;
    private Long goodsId;
    private Long  deliveryAddrId;
    private String goodsName;
    private Integer goodsCount;
    private Double goodsPrice;
    private Integer orderChannel;
    private Integer status;
    private Date createDate;
    private Date payDate;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public Long getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(Long goodsId) {
        this.goodsId = goodsId;
    }

    public Long getDeliveryAddrId() {
        return deliveryAddrId;
    }

    public void setDeliveryAddrId(Long deliveryAddrId) {
        this.deliveryAddrId = deliveryAddrId;
    }

    public String getGoodsName() {
        return goodsName;
    }

    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }

    public Integer getGoodsCount() {
        return goodsCount;
    }

    public void setGoodsCount(Integer goodsCount) {
        this.goodsCount = goodsCount;
    }

    public Double getGoodsPrice() {
        return goodsPrice;
    }

    public void setGoodsPrice(Double goodsPrice) {
        this.goodsPrice = goodsPrice;
    }

    public Integer getOrderChannel() {
        return orderChannel;
    }

    public void setOrderChannel(Integer orderChannel) {
        this.orderChannel = orderChannel;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }

    public Date getPayDate() {
        return payDate;
    }

    public void setPayDate(Date payDate) {
        this.payDate = payDate;
    }
}
OrderInfo java初探(1)之秒杀项目总结
package com.miaosha.entity.domain;

public class MiaoshaOrder {

    private Long id;
    private Long userId;
    private Long  orderId;
    private Long goodsId;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public Long getOrderId() {
        return orderId;
    }

    public void setOrderId(Long orderId) {
        this.orderId = orderId;
    }

    public Long getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(Long goodsId) {
        this.goodsId = goodsId;
    }
}
MiaoshaOrder

在vo包下,分析业务逻辑,可以知道在商品列表页面,需要一个展示所有商品的属性,因此可以抽象出一个vo类:GoodsVO;在商品详情页面,可以抽象出GoodsDetailVo类,在订单详情页面也可以抽象出一个实体类:OrderDetailVo类。总结来说,一个页面对应一个vo实体类。

java初探(1)之秒杀项目总结
package com.miaosha.entity.vo;

import com.miaosha.entity.domain.Goods;

import java.util.Date;

public class GoodsVo extends Goods {

    private Double miaoshaPrice;
    private Integer stockCount;
    private Date startDate;
    private Date endDate;

    public Double getMiaoshaPrice() {
        return miaoshaPrice;
    }

    public void setMiaoshaPrice(Double miaoshaPrice) {
        this.miaoshaPrice = miaoshaPrice;
    }

    public Integer getStockCount() {
        return stockCount;
    }

    public void setStockCount(Integer stockCount) {
        this.stockCount = stockCount;
    }

    public Date getStartDate() {
        return startDate;
    }

    public void setStartDate(Date startDate) {
        this.startDate = startDate;
    }

    public Date getEndDate() {
        return endDate;
    }

    public void setEndDate(Date endDate) {
        this.endDate = endDate;
    }
}
GoodsVo java初探(1)之秒杀项目总结
package com.miaosha.entity.vo;

import com.miaosha.entity.domain.MiaoshaUser;

public class GoodsDetailVo {

    private int miaoshaStatus = 0;
    private int remainSeconds = 0;
    private GoodsVo goods ;
    private MiaoshaUser user;

    public int getMiaoshaStatus() {
        return miaoshaStatus;
    }

    public void setMiaoshaStatus(int miaoshaStatus) {
        this.miaoshaStatus = miaoshaStatus;
    }

    public int getRemainSeconds() {
        return remainSeconds;
    }

    public void setRemainSeconds(int remainSeconds) {
        this.remainSeconds = remainSeconds;
    }

    public GoodsVo getGoods() {
        return goods;
    }

    public void setGoods(GoodsVo goods) {
        this.goods = goods;
    }

    public MiaoshaUser getUser() {
        return user;
    }

    public void setUser(MiaoshaUser user) {
        this.user = user;
    }
}
GoodsDetailVo java初探(1)之秒杀项目总结
package com.miaosha.entity.vo;

import com.miaosha.entity.domain.OrderInfo;

public class OrderDetailVo {

    private GoodsVo goods;
    private OrderInfo order;

    public GoodsVo getGoods() {
        return goods;
    }

    public void setGoods(GoodsVo goods) {
        this.goods = goods;
    }

    public OrderInfo getOrder() {
        return order;
    }

    public void setOrder(OrderInfo order) {
        this.order = order;
    }
}
OrderDetailVo

以上就是我们所有与业务直接相关的实体类

 

这里我们就将数据库的字段和实体类之间做了初步的映射,利用mybaties框架,可以很轻松的将其一一对应。这在mybaties的配置文件中已经有了说明

# mybatis
mybatis.type-aliases-package=com.miaosha.entity
mybatis.configuration.map-underscore-to-camel-case=true #开启驼峰验证,对应关系
mybatis.configuration.default-fetch-size=100
mybatis.configuration.default-statement-timeout=3000
#mybatis.mapperLocations = classpath:com/imooc/miaosha/dao/*.xml

 

持久层操作接口

为了实现IOC原则,尽量使用注入原则,dao类可以使用接口加注解来实现,之后就只使用注入的方式创建对象,减低耦合性。

dao包中的持久层类应该与domain包下的实体类相对应,并兼顾业务逻辑。

分为两大类,一类是商品相关的,一类是订单相关的。

在商品列表页面,需要返回所有的商品列表,因此,需要将所有的GoodsVO都查询出来,包装在list里面       如 List<GoodsVo> listGoodsVo();

在业务判断的过程中也需要获取GoodsVO,经常传过来的有user和goosId。 如GoodsVo getGoodsVoByGoodsId(@Param("goodsId")long goodsId);

在执行秒杀操作的时候,需要更新秒杀商品表的库存    如int reduceStock(MiaoshaGoods g);

商品的dao如下:

java初探(1)之秒杀项目总结
package com.miaosha.dao;

import com.miaosha.entity.domain.MiaoshaGoods;
import com.miaosha.entity.vo.GoodsVo;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

@Mapper
public interface GoodsDao {

    @Select("select g.*,mg.stock_count, mg.start_date, mg.end_date,mg.miaosha_price from miaosha_goods mg left join goods g on mg.goods_id = g.id")
     List<GoodsVo> listGoodsVo();

    @Select("select g.*,mg.stock_count, mg.start_date, mg.end_date,mg.miaosha_price from miaosha_goods mg left join goods g on mg.goods_id = g.id where g.id = #{goodsId}")
     GoodsVo getGoodsVoByGoodsId(@Param("goodsId")long goodsId);

    @Update("update miaosha_goods set stock_count = stock_count - 1 where goods_id = #{goodsId} and stock_count > 0")
     int reduceStock(MiaoshaGoods g);

    @Update("update miaosha_goods set stock_count = #{stockCount} where goods_id = #{goodsId}")
     int resetStock(MiaoshaGoods g);

}
GoodsDao java初探(1)之秒杀项目总结
package com.miaosha.dao;


import com.miaosha.entity.domain.MiaoshaOrder;
import com.miaosha.entity.domain.OrderInfo;
import org.apache.ibatis.annotations.*;

@Mapper
public interface OrderDao {

    @Select("select * from miaosha_order where user_id=#{userId} and goods_id=#{goodsId}")
    public MiaoshaOrder getMiaoshaOrderByUserIdGoodsId(@Param("userId")long userId, @Param("goodsId")long goodsId);

    @Insert("insert into order_info(user_id, goods_id, goods_name, goods_count, goods_price, order_channel, status, create_date)values("
            + "#{userId}, #{goodsId}, #{goodsName}, #{goodsCount}, #{goodsPrice}, #{orderChannel},#{status},#{createDate} )")
    @SelectKey(keyColumn="id", keyProperty="id", resultType=long.class, before=false, statement="select last_insert_id()")
    public long insert(OrderInfo orderInfo);

    @Insert("insert into miaosha_order (user_id, goods_id, order_id)values(#{userId}, #{goodsId}, #{orderId})")
    public int insertMiaoshaOrder(MiaoshaOrder miaoshaOrder);

    @Select("select * from order_info where id = #{orderId}")
    public OrderInfo getOrderById(@Param("orderId")long orderId);

    @Delete("delete from order_info")
    public void deleteOrders();

    @Delete("delete from miaosha_order")
    public void deleteMiaoshaOrders();
}
OrderDao

 

商品列表页面

登录成功以后,跳转到服务器的goods/tolist请求,在此页面,获得商品的列表,然后在页面显示,这里使用了页面缓存的技术,将整个页面缓存在redis中,除了第一次请求,以后每次请求都将从缓存中直接取到html页面。

但在此之前,我们需要提供一个配置类,继承一个WebMvcConfigurerAdapter类,此类是一个在启动后就配置的类,常用方法如下:

/** 解决跨域问题 **/
public void addCorsMappings(CorsRegistry registry) ;

/** 添加拦截器 **/
void addInterceptors(InterceptorRegistry registry);

/** 这里配置视图解析器 **/
void configureViewResolvers(ViewResolverRegistry registry);

/** 配置内容裁决的一些选项 **/
void configureContentNegotiation(ContentNegotiationConfigurer configurer);

/** 视图跳转控制器 **/
void addViewControllers(ViewControllerRegistry registry);

/** 静态资源处理 **/
void addResourceHandlers(ResourceHandlerRegistry registry);

/** 默认静态资源处理器 **/
void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer);

这里是配置一个和参数有关的方法addArgumentResolvers,这是一个参数解析器,将页面传过来的参数自己去解析成想要的类型,其实在spring中很多参数是自动解析的,不需要我们配置,但有时候需要我们自己去解析这些参数。

这里的业务场景是,我们如果不传reques,就无法取到user对象,而且,如果我们的服务器时分布式的,就无法传递session值,因此我们在登录的时候,就在客户端添加了一个参数随机的cookie,并将该cookie值作为可以,进行redis缓存。

因此,我们可以利用参数解析器,将user值通过cookie来取到。

首先创建一个WebConfig类,然后继承WebMvcConfigurerAdapter前置配置类,然后实现其参数解析器的方法,并将自己定义的解析逻辑添加进去

java初探(1)之秒杀项目总结
package com.miaosha.util.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.util.List;

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter{

    @Autowired
    UserArgumentResolver userArgumentResolver;

    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
        argumentResolvers.add(userArgumentResolver);
    }


}
WebConfig

实现解析逻辑的类先继承参数解析的接口,然后添加支持MiaoshaUser类作为解析参数的方法,然后添加具体的解析逻辑,其实逻辑很简单,就是通过request取到cookie值,然后通过MiaoshaUserService的方法来从缓存中得到user值。

java初探(1)之秒杀项目总结
package com.miaosha.util.config;

import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.service.MiaoshaUserService;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.MethodParameter;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Service
public class UserArgumentResolver implements HandlerMethodArgumentResolver{

    private MiaoshaUserService userService;

    //添加支持的参数类型
    @Override
    public boolean supportsParameter(MethodParameter methodParameter) {
        Class<?> clazz=methodParameter.getParameterType();
        return clazz== MiaoshaUser.class;
    }

    @Override
    public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {

        HttpServletRequest request = nativeWebRequest.getNativeRequest(HttpServletRequest.class);
        HttpServletResponse response = nativeWebRequest.getNativeResponse(HttpServletResponse.class);

        String paramToken = request.getParameter(MiaoshaUserService.COOKI_NAME_TOKEN);
        String cookieToken = getCookieValue(request, MiaoshaUserService.COOKI_NAME_TOKEN);
        if(StringUtils.isEmpty(cookieToken) && StringUtils.isEmpty(paramToken)) {
            return null;
        }
        String token = StringUtils.isEmpty(paramToken)?cookieToken:paramToken;
        return userService.getByToken(response, token);
    }

    private String getCookieValue(HttpServletRequest request, String cookiName) {
        Cookie[]  cookies = request.getCookies();
        if(cookies == null || cookies.length <= 0){
            return null;
        }
        for(Cookie cookie : cookies) {
            if(cookie.getName().equals(cookiName)) {
                return cookie.getValue();
            }
        }
        return null;
    }
}
UserArgumentResolver

这样,就自定义了一个参数解析器,每次请求都会得到user参数

接下来需要从缓存中去html,如果有html则直接返回,加上responseBody标签,可以直接在页面显示商品列表页面。如果没有,则需要将商品的列表从数据库中取到,然后利用spring的页面解析器将页面解析好。使用的是thymeleafViewResolver.getTemplateEngine().process()方法。

java初探(1)之秒杀项目总结
package com.miaosha.controller;

import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.vo.GoodsDetailVo;
import com.miaosha.entity.vo.GoodsVo;
import com.miaosha.entity.vo.result.Result;
import com.miaosha.service.GoodsService;
import com.miaosha.service.MiaoshaUserService;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import com.miaosha.util.redisconfig.key.GoodsKey;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.spring4.context.SpringWebContext;
import org.thymeleaf.spring4.view.ThymeleafViewResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;

@Controller
@RequestMapping("/goods")
public class GoodsController {


    @Autowired
    MiaoshaUserService userService;

    @Autowired
    MyRedisTemplate redisService;

    @Autowired
    GoodsService goodsService;

    @Autowired
    ThymeleafViewResolver thymeleafViewResolver;

    @Autowired
    ApplicationContext applicationContext;

    @RequestMapping(value="/to_list", produces="text/html")
    @ResponseBody
    public String list(HttpServletRequest request, HttpServletResponse response, Model model, MiaoshaUser user) {
        model.addAttribute("user", user);
        //取缓存
        String html = redisService.get(GoodsKey.getGoodsList, "", String.class);
        if(!StringUtils.isEmpty(html)) {
            return html;
        }
        List<GoodsVo> goodsList = goodsService.listGoodsVo();
        model.addAttribute("goodsList", goodsList);
//         return "goods_list";
        SpringWebContext ctx = new SpringWebContext(request,response,
                request.getServletContext(),request.getLocale(), model.asMap(), applicationContext );
        //手动渲染
        html = thymeleafViewResolver.getTemplateEngine().process("goods_list", ctx);
        if(!StringUtils.isEmpty(html)) {
            redisService.set(GoodsKey.getGoodsList, "", html);
        }
        System.out.println("GoodsController:"+html);
        return html;
    }

    @RequestMapping(value="/detail/{goodsId}")
    @ResponseBody
    public Result<GoodsDetailVo> detail(HttpServletRequest request, HttpServletResponse response, Model model, MiaoshaUser user,
                                        @PathVariable("goodsId")long goodsId) {
        GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
        long startAt = goods.getStartDate().getTime();
        long endAt = goods.getEndDate().getTime();
        long now = System.currentTimeMillis();
        int miaoshaStatus = 0;
        int remainSeconds = 0;
        if(now < startAt ) {//秒杀还没开始,倒计时
            miaoshaStatus = 0;
            remainSeconds = (int)((startAt - now )/1000);
        }else  if(now > endAt){//秒杀已经结束
            miaoshaStatus = 2;
            remainSeconds = -1;
        }else {//秒杀进行中
            miaoshaStatus = 1;
            remainSeconds = 0;
        }
        GoodsDetailVo vo = new GoodsDetailVo();
        vo.setGoods(goods);
        vo.setUser(user);
        vo.setRemainSeconds(remainSeconds);
        vo.setMiaoshaStatus(miaoshaStatus);
        return Result.success(vo);
    }
}
GoodsController

 

商品详情页面

这个页面因为有秒杀的实际操作,因此是最复杂的。将商品列表展示出来之后,每个商品后面有一个详情的链接,如果点击的话,就直接跳转到商品详情页。

直接跳转的页面需要是静态页面,但我们的页面时动态的,因此需要利用页面静态化的技术,当客户端将页面加载解析完之后,通过一个入口函数,自动ajax请求,将需要的详情数据返回,然后在页面上展示出来。

java初探(1)之秒杀项目总结
$(function(){
    //countDown();
    getDetail();
});

function getDetail(){
    var goodsId = g_getQueryString("goodsId");
    $.ajax({
        url:"/goods/detail/"+goodsId,
        type:"GET",
        success:function(data){
            if(data.code == 0){
                render(data.data);
            }else{
                layer.msg(data.msg);
            }
        },
        error:function(){
            layer.msg("客户端请求有误");
        }
    });
}
function render(detail){
    var miaoshaStatus = detail.miaoshaStatus;
    var  remainSeconds = detail.remainSeconds;
    var goods = detail.goods;
    var user = detail.user;
    if(user){
        $("#userTip").hide();
    }
    $("#goodsName").text(goods.goodsName);
    $("#goodsImg").attr("src", goods.goodsImg);
    $("#startTime").text(new Date(goods.startDate).format("yyyy-MM-dd hh:mm:ss"));
    $("#remainSeconds").val(remainSeconds);
    $("#goodsId").val(goods.id);
    $("#goodsPrice").text(goods.goodsPrice);
    $("#miaoshaPrice").text(goods.miaoshaPrice);
    $("#stockCount").text(goods.stockCount);
    countDown();
}
function countDown(){
    var remainSeconds = $("#remainSeconds").val();
    var timeout;
    if(remainSeconds > 0){//秒杀还没开始,倒计时
       $("#buyButton").attr("disabled", true);
       $("#miaoshaTip").html("秒杀倒计时:"+remainSeconds+"秒");
        timeout = setTimeout(function(){
            $("#countDown").text(remainSeconds - 1);
            $("#remainSeconds").val(remainSeconds - 1);
            countDown();
        },1000);
    }else if(remainSeconds == 0){//秒杀进行中
        $("#buyButton").attr("disabled", false);
        if(timeout){
            clearTimeout(timeout);
        }
        $("#miaoshaTip").html("秒杀进行中");
        $("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val());
        $("#verifyCodeImg").show();
        $("#verifyCode").show();
    }else{//秒杀已经结束
        $("#buyButton").attr("disabled", true);
        $("#miaoshaTip").html("秒杀已经结束");
        $("#verifyCodeImg").hide();
        $("#verifyCode").hide();
    }
}
入口函数加载数据

ajax请求的路径是获取详情,这里需要获取的数据都已经封装到GoodsDetailVo类中了,只需要将其全部得到,然后返回即可(这里注意的是,在获取这些数据的过程中如果使用缓存技术能很大程度的提高性能。降低并发)

java初探(1)之秒杀项目总结
@RequestMapping(value="/detail/{goodsId}")
    @ResponseBody
    public Result<GoodsDetailVo> detail(HttpServletRequest request, HttpServletResponse response, Model model, MiaoshaUser user,
                                        @PathVariable("goodsId")long goodsId) {
        GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
        long startAt = goods.getStartDate().getTime();
        long endAt = goods.getEndDate().getTime();
        long now = System.currentTimeMillis();
        int miaoshaStatus = 0;
        int remainSeconds = 0;
        if(now < startAt ) {//秒杀还没开始,倒计时
            miaoshaStatus = 0;
            remainSeconds = (int)((startAt - now )/1000);
        }else  if(now > endAt){//秒杀已经结束
            miaoshaStatus = 2;
            remainSeconds = -1;
        }else {//秒杀进行中
            miaoshaStatus = 1;
            remainSeconds = 0;
        }
        GoodsDetailVo vo = new GoodsDetailVo();
        vo.setGoods(goods);
        vo.setUser(user);
        vo.setRemainSeconds(remainSeconds);
        vo.setMiaoshaStatus(miaoshaStatus);
        return Result.success(vo);
    }
detail

 

秒杀逻辑

点击秒杀按钮,然后不是直接执行秒杀逻辑,而是需要去服务器请求一个路径,(为了在秒杀前隐藏接口,防止盗刷),然后将返回的接口进行拼装,然后请求这个随机的路径,执行真正的秒杀逻辑。

首先判断库存是否大于0,然后判断是否已经下单(不能重复秒杀),当这些都达到条件的时候,可以将user和商品id封装到一个类中,传到RabbitMQ队列中。然后从接收的队列中取。这样就会极大的缓减了网站的并发量,从出队中取到值后,再进行判断库存和订单,然后再执行减库存和下订单的操作。

当完成下订单的操作之后,秒杀逻辑其实已经做完了,但需要将数据返回到页面去跳转到订单的详情页面,这就需要在返回成功的逻辑上设置一个轮询函数,不停的请求服务器,看是否已经下了订单,当下了订单之后,就可以直接跳转到订单详情页面。

秒杀验证码,该验证码是直接向内存中拿到的图片,但需要我们服务器传回到内存中

$("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val());
$("#verifyCodeImg").show();

验证码生成逻辑:

页面发出对服务器的请求,请求一张图片,而服务器将图片生成后,写入到内存中,被浏览器取到。

java初探(1)之秒杀项目总结
package com.miaosha.controller;

import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.vo.result.CodeMsg;
import com.miaosha.entity.vo.result.Result;
import com.miaosha.service.MiaoshaService;
import com.miaosha.service.MiaoshaUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.OutputStream;

@Controller
@RequestMapping("/miaosha")
public class MiaoshaController {

    @Autowired
    private MiaoshaService miaoshaService;


    @RequestMapping(value="/verifyCode", method=RequestMethod.GET)
    @ResponseBody
    public Result<String> getMiaoshaVerifyCod(HttpServletResponse response, MiaoshaUser user,
                                              @RequestParam("goodsId")long goodsId) {
        if(user == null) {
            return Result.error(CodeMsg.SESSION_ERROR);
        }
        System.out.println("请求进来了");
        try {
            BufferedImage image  = miaoshaService.createVerifyCode(user, goodsId);
            OutputStream out = response.getOutputStream();
            ImageIO.write(image, "JPEG", out);
            out.flush();
            out.close();
            return null;
        }catch(Exception e) {
            e.printStackTrace();
            return Result.error(CodeMsg.MIAOSHA_FAIL);
        }
    }


//    @RequestMapping(value="/path", method= RequestMethod.GET)
//    @ResponseBody
//    public Result<String> getMiaoshaPath(HttpServletRequest request, MiaoshaUser user,
//                                         @RequestParam("goodsId")long goodsId,
//                                         @RequestParam(value="verifyCode", defaultValue="0")int verifyCode
//    ) {
//        if(user == null) {
//            return Result.error(CodeMsg.SESSION_ERROR);
//        }
//        boolean check = miaoshaService.checkVerifyCode(user, goodsId, verifyCode);
//        if(!check) {
//            return Result.error(CodeMsg.REQUEST_ILLEGAL);
//        }
//        String path  =miaoshaService.createMiaoshaPath(user, goodsId);
//        return Result.success(path);
//    }


}
MiaoshaController java初探(1)之秒杀项目总结
package com.miaosha.service;

import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import com.miaosha.util.redisconfig.key.MiaoshaKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

@Service
public class MiaoshaService {

    @Autowired
    private MyRedisTemplate redisService;

    public BufferedImage createVerifyCode(MiaoshaUser user, long goodsId) {
        if(user == null || goodsId <=0) {
            return null;
        }
        int width = 80;
        int height = 32;
        //create the image
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        // set the background color
        g.setColor(new Color(0xDCDCDC));
        g.fillRect(0, 0, width, height);
        // draw the border
        g.setColor(Color.black);
        g.drawRect(0, 0, width - 1, height - 1);
        // create a random instance to generate the codes
        Random rdm = new Random();
        // make some confusion
        for (int i = 0; i < 50; i++) {
            int x = rdm.nextInt(width);
            int y = rdm.nextInt(height);
            g.drawOval(x, y, 0, 0);
        }
        // generate a random code
        String verifyCode = generateVerifyCode(rdm);
        g.setColor(new Color(0, 100, 0));
        g.setFont(new Font("Candara", Font.BOLD, 24));
        g.drawString(verifyCode, 8, 24);
        g.dispose();
        //把验证码存到redis中
        int rnd = calc(verifyCode);
        redisService.set(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId, rnd);
        //输出图片
        return image;
    }

    private static char[] ops = new char[] {'+', '-', '*'};
    /**
     * + - *
     * */
    private String generateVerifyCode(Random rdm) {
        int num1 = rdm.nextInt(10);
        int num2 = rdm.nextInt(10);
        int num3 = rdm.nextInt(10);
        char op1 = ops[rdm.nextInt(3)];
        char op2 = ops[rdm.nextInt(3)];
        String exp = ""+ num1 + op1 + num2 + op2 + num3;
        return exp;
    }

    private static int calc(String exp) {
        try {
            ScriptEngineManager manager = new ScriptEngineManager();
            ScriptEngine engine = manager.getEngineByName("JavaScript");
            return (Integer)engine.eval(exp);
        }catch(Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
}
MiaoshaService

当页面根据图片输入验证码之后,点击立刻秒杀按钮,不是立刻执行秒杀逻辑,而是去请求一个随机的秒杀路径。

MiaoshaController类中的方法,得到随机的秒杀路径

java初探(1)之秒杀项目总结
@RequestMapping(value="/path", method= RequestMethod.GET)
    @ResponseBody
    public Result<String> getMiaoshaPath(HttpServletRequest request, MiaoshaUser user,
                                         @RequestParam("goodsId")long goodsId,
                                         @RequestParam(value="verifyCode", defaultValue="0")int verifyCode
    ) {
        if(user == null) {
            return Result.error(CodeMsg.SESSION_ERROR);
        }
        boolean check = miaoshaService.checkVerifyCode(user, goodsId, verifyCode);
        if(!check) {
            return Result.error(CodeMsg.REQUEST_ILLEGAL);
        }
        String path  =miaoshaService.createMiaoshaPath(user, goodsId);
        return Result.success(path);
    }
getMiaoshaPath

其中调用两个方法,MiaoshaService中

java初探(1)之秒杀项目总结
public boolean checkVerifyCode(MiaoshaUser user, long goodsId, int verifyCode) {
        if(user == null || goodsId <=0) {
            return false;
        }
        Integer codeOld = redisService.get(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId, Integer.class);
        if(codeOld == null || codeOld - verifyCode != 0 ) {
            return false;
        }
        redisService.delete(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId);
        return true;
    }

    public String createMiaoshaPath(MiaoshaUser user, long goodsId) {
        if(user == null || goodsId <=0) {
            return null;
        }
        String str = MD5Util.md5(UUIDUtil.uuid()+"123456");
        redisService.set(MiaoshaKey.getMiaoshaPath, ""+user.getId() + "_"+ goodsId, str);
        return str;
    }
checkVerifyCode and createMiaoshaPath

这样就请求到了随机的路径,并检查了验证码是否正确。

然后返回一个随机路径,页面收到之后,立刻又发起了ajax请求,请求执行秒杀逻辑,判断库存、订单,之后,将用户和商品id封装到一个实体类中,抛入RabbitMQ的入队中。

定义需要封装的BO类,MiaoshaMessage

java初探(1)之秒杀项目总结
package com.miaosha.entity.bo;

import com.miaosha.entity.domain.MiaoshaUser;

public class MiaoshaMessage {

    private MiaoshaUser user;
    private long goodsId;

    public MiaoshaUser getUser() {
        return user;
    }

    public void setUser(MiaoshaUser user) {
        this.user = user;
    }

    public long getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(long goodsId) {
        this.goodsId = goodsId;
    }
}
MiaoshaMessage

然后将此类抛到消息队列中去

在此之前,需要做一些准备工作

步骤1:检查路径是否正确

java初探(1)之秒杀项目总结
public boolean checkPath(MiaoshaUser user, long goodsId, String path) {
        if(user == null || path == null) {
            return false;
        }
        String pathOld = redisService.get(MiaoshaKey.getMiaoshaPath, ""+user.getId() + "_"+ goodsId, String.class);
        return path.equals(pathOld);
    }
checkPath

步骤2:对内存进行标记,减少对redis的访问,将库存是否已经为0的消息存放在一个map中,在最开始去判断它,如果没有库存直接返回,有继续。这里需要MiaoshaController类中继承一个初始化接口,实现一个方法,该方法会在类加载的时候就开始执行,将库存先标记为有。

java初探(1)之秒杀项目总结
private HashMap<Long, Boolean> localOverMap =  new HashMap<Long, Boolean>();
    @Override
    public void afterPropertiesSet() throws Exception {
        List<GoodsVo> goodsList = goodsService.listGoodsVo();
        if(goodsList == null) {
            return;
        }
        for(GoodsVo goods : goodsList) {
            redisService.set(GoodsKey.getMiaoshaGoodsStock, ""+goods.getId(), goods.getStockCount());
            localOverMap.put(goods.getId(), false);
        }
    }
afterPropertiesSet java初探(1)之秒杀项目总结
//内存标记,减少redis访问
        boolean over = localOverMap.get(goodsId);
        if(over) {
            return Result.error(CodeMsg.MIAO_SHA_OVER);
        }
内存标记

步骤3:预减库存,在redis中存储库存值,先减掉一个判断是否小于0,小于0,则标记内存,然后直接返回错误。

java初探(1)之秒杀项目总结
//预减库存
        long stock = redisService.decr(GoodsKey.getMiaoshaGoodsStock, ""+goodsId);//10
        if(stock < 0) {
            localOverMap.put(goodsId, true);
            return Result.error(CodeMsg.MIAO_SHA_OVER);
        }
预减库存

步骤4:判断是否已经下单,若下单,则返回错误,不能重复下单,这里需要一个Order的service类,来返回从数据库中查到的结果。

java初探(1)之秒杀项目总结
package com.miaosha.service;

import com.miaosha.dao.OrderDao;
import com.miaosha.entity.domain.MiaoshaOrder;
import com.miaosha.entity.domain.OrderInfo;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import com.miaosha.util.redisconfig.key.OrderKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class OrderService {

    @Autowired
    private OrderDao orderDao;

    @Autowired
    private MyRedisTemplate redisService;

    public MiaoshaOrder getMiaoshaOrderByUserIdGoodsId(long userId, long goodsId) {
        //return orderDao.getMiaoshaOrderByUserIdGoodsId(userId, goodsId);
        return redisService.get(OrderKey.getMiaoshaOrderByUidGid, ""+userId+"_"+goodsId, MiaoshaOrder.class);
    }

    public OrderInfo getOrderById(long orderId) {
        return orderDao.getOrderById(orderId);
    }




    public void deleteOrders() {
        orderDao.deleteOrders();
        orderDao.deleteMiaoshaOrders();
    }
}
OrderService

步骤5:实现入队操作,先配置RabbitMQ,配置一个队列。

java初探(1)之秒杀项目总结
package com.miaosha.util.rabbitmq;

import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


import static org.springframework.amqp.core.Binding.DestinationType.QUEUE;

@Configuration
public class MQConfig {
    public static final String MIAOSHA_QUEUE = "miaosha.queue";

    @Bean
    public Queue queue() {
        return new Queue(MIAOSHA_QUEUE, true);
    }
}
MQConfig

入队函数

java初探(1)之秒杀项目总结
package com.miaosha.util.rabbitmq;

import com.miaosha.entity.bo.MiaoshaMessage;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class MQSender {

    private static Logger log = LoggerFactory.getLogger(MQSender.class);

    @Autowired
    AmqpTemplate amqpTemplate ;


    public void sendMiaoshaMessage(MiaoshaMessage mm) {
        String msg = MyRedisTemplate.beanToString(mm);
        log.info("send message:"+msg);
        amqpTemplate.convertAndSend(MQConfig.MIAOSHA_QUEUE, msg);
    }
}
MQSender

将封装好的消息转换为字符串然后发出去,发到队列中

秒杀逻辑没有结束,但doMiaosha的请求已经处理完了。

java初探(1)之秒杀项目总结
 @RequestMapping(value="/{path}/do_miaosha", method=RequestMethod.POST)
    @ResponseBody
    public Result<Integer> miaosha(Model model, MiaoshaUser user,
                                   @RequestParam("goodsId")long goodsId,
                                   @PathVariable("path") String path) {
        model.addAttribute("user", user);
        if(user == null) {
            return Result.error(CodeMsg.SESSION_ERROR);
        }
        //验证path
        boolean check = miaoshaService.checkPath(user, goodsId, path);
        if(!check){
            return Result.error(CodeMsg.REQUEST_ILLEGAL);
        }
        //内存标记,减少redis访问
        boolean over = localOverMap.get(goodsId);
        if(over) {
            return Result.error(CodeMsg.MIAO_SHA_OVER);
        }
        //预减库存
        long stock = redisService.decr(GoodsKey.getMiaoshaGoodsStock, ""+goodsId);//10
        if(stock < 0) {
            localOverMap.put(goodsId, true);
            return Result.error(CodeMsg.MIAO_SHA_OVER);
        }
        //判断是否已经秒杀到了
        MiaoshaOrder order = orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(), goodsId);
        if(order != null) {
            return Result.error(CodeMsg.REPEATE_MIAOSHA);
        }
        //入队
        MiaoshaMessage mm = new MiaoshaMessage();
        mm.setUser(user);
        mm.setGoodsId(goodsId);
        sender.sendMiaoshaMessage(mm);
        return Result.success(0);//排队中

    }
miaosha

 

入队之后,需要出队,因此,需要编写出队的类方法来执行真正的秒杀逻辑,减库存,下单

先将入队时候转换的字符串,转成封装的消息类,然后将继续判断库存,是否下单,最后执行秒杀的真正逻辑

java初探(1)之秒杀项目总结
package com.miaosha.util.rabbitmq;

import com.miaosha.entity.bo.MiaoshaMessage;
import com.miaosha.entity.domain.MiaoshaOrder;
import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.vo.GoodsVo;
import com.miaosha.service.GoodsService;
import com.miaosha.service.MiaoshaService;
import com.miaosha.service.OrderService;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class MQReceiver {

    private static Logger log = LoggerFactory.getLogger(MQReceiver.class);

    @Autowired
    private GoodsService goodsService;

    @Autowired
    private OrderService orderService;

    @Autowired
    private MiaoshaService miaoshaService;

    @RabbitListener(queues=MQConfig.MIAOSHA_QUEUE)
    public void receive(String message) {
        log.info("receive message:"+message);
        MiaoshaMessage mm  = MyRedisTemplate.stringToBean(message, MiaoshaMessage.class);
        MiaoshaUser user = mm.getUser();
        long goodsId = mm.getGoodsId();

        GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
        int stock = goods.getStockCount();
        if(stock <= 0) {
            return;
        }
        //判断是否已经秒杀到了
        MiaoshaOrder order = orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(), goodsId);
        if(order != null) {
            return;
        }
        //减库存 下订单 写入秒杀订单
        miaoshaService.miaosha(user, goods);
    }


}
MQReceiver

真正的秒杀逻辑

java初探(1)之秒杀项目总结
package com.miaosha.service;

import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.domain.OrderInfo;
import com.miaosha.entity.vo.GoodsVo;
import com.miaosha.util.MD5Util;
import com.miaosha.util.UUIDUtil;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import com.miaosha.util.redisconfig.key.MiaoshaKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

@Service
public class MiaoshaService {

    @Autowired
    private MyRedisTemplate redisService;

    @Autowired
    private GoodsService goodsService;

    @Autowired
    private OrderService orderService;

    public BufferedImage createVerifyCode(MiaoshaUser user, long goodsId) {
        if(user == null || goodsId <=0) {
            return null;
        }
        int width = 80;
        int height = 32;
        //create the image
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        // set the background color
        g.setColor(new Color(0xDCDCDC));
        g.fillRect(0, 0, width, height);
        // draw the border
        g.setColor(Color.black);
        g.drawRect(0, 0, width - 1, height - 1);
        // create a random instance to generate the codes
        Random rdm = new Random();
        // make some confusion
        for (int i = 0; i < 50; i++) {
            int x = rdm.nextInt(width);
            int y = rdm.nextInt(height);
            g.drawOval(x, y, 0, 0);
        }
        // generate a random code
        String verifyCode = generateVerifyCode(rdm);
        g.setColor(new Color(0, 100, 0));
        g.setFont(new Font("Candara", Font.BOLD, 24));
        g.drawString(verifyCode, 8, 24);
        g.dispose();
        //把验证码存到redis中
        int rnd = calc(verifyCode);
        redisService.set(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId, rnd);
        //输出图片
        return image;
    }

    private static char[] ops = new char[] {'+', '-', '*'};
    /**
     * + - *
     * */
    private String generateVerifyCode(Random rdm) {
        int num1 = rdm.nextInt(10);
        int num2 = rdm.nextInt(10);
        int num3 = rdm.nextInt(10);
        char op1 = ops[rdm.nextInt(3)];
        char op2 = ops[rdm.nextInt(3)];
        String exp = ""+ num1 + op1 + num2 + op2 + num3;
        return exp;
    }

    private static int calc(String exp) {
        try {
            ScriptEngineManager manager = new ScriptEngineManager();
            ScriptEngine engine = manager.getEngineByName("JavaScript");
            return (Integer)engine.eval(exp);
        }catch(Exception e) {
            e.printStackTrace();
            return 0;
        }
    }


    public boolean checkVerifyCode(MiaoshaUser user, long goodsId, int verifyCode) {
        if(user == null || goodsId <=0) {
            return false;
        }
        Integer codeOld = redisService.get(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId, Integer.class);
        if(codeOld == null || codeOld - verifyCode != 0 ) {
            return false;
        }
        redisService.delete(MiaoshaKey.getMiaoshaVerifyCode, user.getId()+","+goodsId);
        return true;
    }

    public String createMiaoshaPath(MiaoshaUser user, long goodsId) {
        if(user == null || goodsId <=0) {
            return null;
        }
        String str = MD5Util.md5(UUIDUtil.uuid()+"123456");
        redisService.set(MiaoshaKey.getMiaoshaPath, ""+user.getId() + "_"+ goodsId, str);
        return str;
    }


    public boolean checkPath(MiaoshaUser user, long goodsId, String path) {
        if(user == null || path == null) {
            return false;
        }
        String pathOld = redisService.get(MiaoshaKey.getMiaoshaPath, ""+user.getId() + "_"+ goodsId, String.class);
        return path.equals(pathOld);
    }

    @Transactional
    public OrderInfo miaosha(MiaoshaUser user, GoodsVo goods) {
        //减库存 下订单 写入秒杀订单
        boolean success = goodsService.reduceStock(goods);
        if(success) {
            //order_info maiosha_order
            return orderService.createOrder(user, goods);
        }else {
            setGoodsOver(goods.getId());
            return null;
        }
    }

    private void setGoodsOver(Long goodsId) {
        redisService.set(MiaoshaKey.isGoodsOver, ""+goodsId, true);
    }

    private boolean getGoodsOver(long goodsId) {
        return redisService.exists(MiaoshaKey.isGoodsOver, ""+goodsId);
    }
}
MiaoshaService

 

然后去处理页面发出的轮询请求

然后向页面返回了一个0,表示正在排队中,需要等待,等待的逻辑是不停的调用一个请求结果的ajax。

java初探(1)之秒杀项目总结getMiaoshaResult java初探(1)之秒杀项目总结
@RequestMapping(value="/result", method=RequestMethod.GET)
    @ResponseBody
    public Result<Long> miaoshaResult(Model model,MiaoshaUser user,
                                      @RequestParam("goodsId")long goodsId) {
        model.addAttribute("user", user);
        if(user == null) {
            return Result.error(CodeMsg.SESSION_ERROR);
        }
        long result  =miaoshaService.getMiaoshaResult(user.getId(), goodsId);
        return Result.success(result);
    }
miaoshaResult java初探(1)之秒杀项目总结
public long getMiaoshaResult(Long userId, long goodsId) {
        MiaoshaOrder order = orderService.getMiaoshaOrderByUserIdGoodsId(userId, goodsId);
        if(order != null) {//秒杀成功
            return order.getOrderId();
        }else {
            boolean isOver = getGoodsOver(goodsId);
            if(isOver) {
                return -1;
            }else {
                return 0;
            }
        }
    }
getMiaoshaResult

这三个函数就是查询订单数据库是否已经下单,若是下单就是秒杀成功了,跳转到订单详情页面,若没有则继续轮询。同时,从缓存中查询秒杀是否已经结束,若结束则返回已结束。

但没有添加防盗刷的功能,需要判断一个用户发起了几次请求,比如一个用户在五秒内只能发起5次请求,防止一些人使用机器去刷,因此,需要判断请求次数,如果请求超过了五次,就返回错误消息。

使用拦截器,自定义一个注解来方便的配置这些信息。

步骤1:定义一个注解,可以配置时间,次数,和是否必须登录

java初探(1)之秒杀项目总结
package com.miaosha.util.access;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Retention(RUNTIME)
@Target(METHOD)
public @interface AccessLimit {

    int seconds();
    int maxCount();
    boolean needLogin() default true;
}
AccessLimit

步骤2:实现注解的逻辑

该逻辑类继承一个拦截器的抽象类,然后得到上述的注解,并得到用户,这里的用户使用cookie来得到,然后用本地线程将用户类绑定,定义得到用户和保存用户的方法,这样是线程安全的,并将从cookie中得到的用户,和当地线程绑定,这样就可以直接获取了。(有了当地线程,可以不用之前写的参数解析器得到的用户了。)然后在redis中使用一个专属的key来存储时间限制,并当每次请求都自增,这样就可以实现注解的功能了。

本地线程绑定用户类

java初探(1)之秒杀项目总结
package com.miaosha.util.access;

import com.miaosha.entity.domain.MiaoshaUser;

public class UserContext {

    private static ThreadLocal<MiaoshaUser> userHolder = new ThreadLocal<MiaoshaUser>();

    public static void setUser(MiaoshaUser user) {
        userHolder.set(user);
    }

    public static MiaoshaUser getUser() {
        return userHolder.get();
    }
}
UserContext java初探(1)之秒杀项目总结
package com.miaosha.util.access;

import com.alibaba.fastjson.JSON;
import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.vo.result.CodeMsg;
import com.miaosha.entity.vo.result.Result;
import com.miaosha.service.MiaoshaUserService;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import com.miaosha.util.redisconfig.key.AccessKey;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;

public class AccessInterceptor extends HandlerInterceptorAdapter {

    @Autowired
    MiaoshaUserService userService;

    @Autowired
    MyRedisTemplate redisService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        if(handler instanceof HandlerMethod) {
            MiaoshaUser user = getUser(request, response);
            UserContext.setUser(user);
            HandlerMethod hm = (HandlerMethod)handler;
            AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class);
            if(accessLimit == null) {
                return true;
            }
            int seconds = accessLimit.seconds();
            int maxCount = accessLimit.maxCount();
            boolean needLogin = accessLimit.needLogin();
            String key = request.getRequestURI();
            if(needLogin) {
                if(user == null) {
                    render(response, CodeMsg.SESSION_ERROR);
                    return false;
                }
                key += "_" + user.getId();
            }else {
                //do nothing
            }
            AccessKey ak = AccessKey.withExpire(seconds);
            Integer count = redisService.get(ak, key, Integer.class);
            if(count  == null) {
                redisService.set(ak, key, 1);
            }else if(count < maxCount) {
                redisService.incr(ak, key);
            }else {
                render(response, CodeMsg.ACCESS_LIMIT_REACHED);
                return false;
            }
        }
        return true;
    }

    private void render(HttpServletResponse response, CodeMsg cm)throws Exception {
        response.setContentType("application/json;charset=UTF-8");
        OutputStream out = response.getOutputStream();
        String str  = JSON.toJSONString(Result.error(cm));
        out.write(str.getBytes("UTF-8"));
        out.flush();
        out.close();
    }

    private MiaoshaUser getUser(HttpServletRequest request, HttpServletResponse response) {
        String paramToken = request.getParameter(MiaoshaUserService.COOKI_NAME_TOKEN);
        String cookieToken = getCookieValue(request, MiaoshaUserService.COOKI_NAME_TOKEN);
        if(StringUtils.isEmpty(cookieToken) && StringUtils.isEmpty(paramToken)) {
            return null;
        }
        String token = StringUtils.isEmpty(paramToken)?cookieToken:paramToken;
        return userService.getByToken(response, token);
    }

    private String getCookieValue(HttpServletRequest request, String cookiName) {
        Cookie[]  cookies = request.getCookies();
        if(cookies == null || cookies.length <= 0){
            return null;
        }
        for(Cookie cookie : cookies) {
            if(cookie.getName().equals(cookiName)) {
                return cookie.getValue();
            }
        }
        return null;
    }
}
AccessInterceptor

然后配置拦截器

java初探(1)之秒杀项目总结
package com.miaosha.util.config;

import com.miaosha.util.access.AccessInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.util.List;

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter{

    @Autowired
    UserArgumentResolver userArgumentResolver;

    @Autowired
    AccessInterceptor accessInterceptor;

    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
        argumentResolvers.add(userArgumentResolver);
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(accessInterceptor);
    }

}
WebConfig

 

到此,所有的秒杀功能都已经结束。


  •  

 

 订单详情页面的展示

当轮询函数请求到了,返回参数为1,说明已经秒杀成功,则直接跳转到订单的详情页面,然后通过入口函数,将需要展示的数据请求过来。

需要订单的业务类

java初探(1)之秒杀项目总结
package com.miaosha.service;

import com.miaosha.dao.OrderDao;
import com.miaosha.entity.domain.MiaoshaOrder;
import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.domain.OrderInfo;
import com.miaosha.entity.vo.GoodsVo;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import com.miaosha.util.redisconfig.key.OrderKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Date;

@Service
public class OrderService {

    @Autowired
    private OrderDao orderDao;

    @Autowired
    private MyRedisTemplate redisService;

    public MiaoshaOrder getMiaoshaOrderByUserIdGoodsId(long userId, long goodsId) {
        return orderDao.getMiaoshaOrderByUserIdGoodsId(userId, goodsId);
//        return redisService.get(OrderKey.getMiaoshaOrderByUidGid, ""+userId+"_"+goodsId, MiaoshaOrder.class);
    }

    public OrderInfo getOrderById(long orderId) {
        return orderDao.getOrderById(orderId);
    }




    public void deleteOrders() {
        orderDao.deleteOrders();
        orderDao.deleteMiaoshaOrders();
    }

    @Transactional
    public OrderInfo createOrder(MiaoshaUser user, GoodsVo goods) {
        OrderInfo orderInfo = new OrderInfo();
        orderInfo.setCreateDate(new Date());
        orderInfo.setDeliveryAddrId(0L);
        orderInfo.setGoodsCount(1);
        orderInfo.setGoodsId(goods.getId());
        orderInfo.setGoodsName(goods.getGoodsName());
        orderInfo.setGoodsPrice(goods.getMiaoshaPrice());
        orderInfo.setOrderChannel(1);
        orderInfo.setStatus(0);
        orderInfo.setUserId(user.getId());
        orderDao.insert(orderInfo);
        MiaoshaOrder miaoshaOrder = new MiaoshaOrder();
        miaoshaOrder.setGoodsId(goods.getId());
        miaoshaOrder.setOrderId(orderInfo.getId());
        miaoshaOrder.setUserId(user.getId());
        orderDao.insertMiaoshaOrder(miaoshaOrder);

        redisService.set(OrderKey.getMiaoshaOrderByUidGid, ""+user.getId()+"_"+goods.getId(), miaoshaOrder);

        return orderInfo;
    }
}
OrderService

 

然后有一个订单的控制器,设置页面的请求路径

java初探(1)之秒杀项目总结
package com.miaosha.controller;

import com.miaosha.entity.domain.MiaoshaUser;
import com.miaosha.entity.domain.OrderInfo;
import com.miaosha.entity.vo.GoodsVo;
import com.miaosha.entity.vo.OrderDetailVo;
import com.miaosha.entity.vo.result.CodeMsg;
import com.miaosha.entity.vo.result.Result;
import com.miaosha.service.GoodsService;
import com.miaosha.service.MiaoshaUserService;
import com.miaosha.service.OrderService;
import com.miaosha.util.redisconfig.MyRedisTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/order")
public class OrderController {



    @Autowired
    OrderService orderService;

    @Autowired
    GoodsService goodsService;

    @RequestMapping("/detail")
    @ResponseBody
    public Result<OrderDetailVo> info(Model model, MiaoshaUser user,
                                      @RequestParam("orderId") long orderId) {
        if(user == null) {
            return Result.error(CodeMsg.SESSION_ERROR);
        }
        OrderInfo order = orderService.getOrderById(orderId);
        if(order == null) {
            return Result.error(CodeMsg.ORDER_NOT_EXIST);
        }
        long goodsId = order.getGoodsId();
        GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
        OrderDetailVo vo = new OrderDetailVo();
        vo.setOrder(order);
        vo.setGoods(goods);
        return Result.success(vo);
    }
}
OrderController

 

 

 到此,整个秒杀项目完成。

 

 

 

 

 

 

 

 

 

 

 

 

 

   
 
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