干货--Redis+Spring+Struts2实现网站计算器应用项目案例

2021-09-11 09:35:18

有关redis的介绍我就不说了，可以参看我前几篇文章,redis快速入门
首先来看一下redis的应用场景

下面是我这个项目的的运行的场景截图

这是我们经常在各博客见到的顶和踩的画面，对于这种场景，我们用非关系型数据库来操作是非常不方便地,不光是查询不方便(写sql语句),而且在高并发的时候，可能会使系统假死,所以redis就派上用场了,它属于非关系型数据库,它直接操作内存,非常快速。
下面直接看代码
首先看看所需的包
除了Spring和Struts2所需的包外还需连接redis的包这里是spring-data-redis

本项目是模拟用户实现顶和踩的功能

所以先创一个实体类User

package com.yc.beans;

public class User {
    private int ding;//顶
    private int cai;//踩


    public int getCai() {
        return cai;
    }

    public void setCai(int cai) {
        this.cai = cai;
    }

    public int getDing() {
        return ding;
    }

    public void setDing(int ding) {
        this.ding = ding;
    }

}

因为是spring+Struts2一起，所以要改web.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" id="WebApp_9" version="2.4">


  <!-- spring的配置文件的路径,   -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext*.xml</param-value>
  </context-param>
  <!-- 配置spring的上下文临听器:  当应用程序一加载到服务器上时，就会调用这个  ContextLoaderListerner, 这个临听器会读取contextConfigLocation配置的spring配置文件，完成
       spring容器的初始化.

     -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- struts2的前端过滤器 -->
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>


  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

首先看一下客户端请求页面 index.jsp

<%@ page
    language="java"
    contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta
    http-equiv="Content-Type"
    content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style>
#head {
    font-family: cursive;
    font-size: 25px;
    color: orange;
    cursor: pointer;
}

#content {height =300px;
    font-family: cursive;
    font-size: 20px;
}

.ding {
    border: 1px solid blue;
    height: 60px;
    width: 70px;
    margin-left: 150px; padding-left10px;
    float: left;
    background: #FFF;
}

.ding img {
    display: inline-block;
    margin-top: 15px;
    margin-left: 10px;
    cursor: pointer;
}

.sding {
    float: left;
    margin-top: 16px;
    font-family: cursive;
    text-decoration: underline;
}
</style>
<script src="js/jquery-1.11.3.js"></script>
<script type="text/javascript">
    //当这个页面加载完毕 则给 loginbtn绑定单击事件
    $(function() {
        $.ajax({
            type : "POST",
            url : "User_Find.action",
            dataType : 'JSON',
            success : function(data) {
                if (data.code == 1) {
                    $("#num").text(data.obj.ding);
                    $("#numcai").text(data.obj.cai);
                } else {
                    alert(data);
                }
            }

        });
    });
    function addDing() {

        $.ajax({
            type : "POST",
            url : "User_Ding.action",
            dataType : 'JSON',
            success : function(data) {
                if (data.code == 1) {
                    $("#num").text(data.obj.ding)
                } else {
                    alert(data);
                }
            }

        });
    }

function addCai(){
        $.ajax({
            type:"POST",
            url:"User_Cai.action",
            dataType:'JSON',
            success: function(data){
                if(data.code==1){
                    $("#numcai").text(data.obj.cai);
                }else{
                    alert(data);
                }
            }

        });
    }
</script>
</head>

<body>
    <center>
        <div style="background: #0F0; height: 400px; width: 600px;">
            <table
                CELLPADDING="0"
                border="1px"
                bordercolor="yellow"
                height="400px"
                width="600px">
                <tr>
                    <th
                        id="head"
                        align="left"
                        height="50px"
                        colspan="3">年度最热门博客</th>
                </tr>
                <tr id="content">

                    <td
                        height="200"
                        colspan="3">都说飞得越高，摔得越惨，但是我想看看我到底会摔得有多惨，落地了，只要没死，那么爬起来，每走一步都是向上！ <br>
                        </br>
                        时间并不会真的帮我们解决什么问题，它只是把原来怎么也想不通的问题，变得不再重要了。
                        </td>
                </tr>
                <tr>
                    <td colspan="3">
                        <div class="ding">
                            <span class="sding">顶</span><img
                                alt="tup"
                                src="images/ding.gif"
                                onclick="addDing()"><span id="num"></span>
                        </div>
                        <div class="ding">
                            <span class="sding">踩</span><img
                                alt="tup"
                                src="images/cai.gif" onclick="addCai()"><span id="numcai"></span>
                        </div>
                    </td>
                </tr>
            </table>
        </div>
    </center>

</body>



</html>

它发请求到UserAction，请后台传递数据用JSON
所以再看看Struts.xml,

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <!-- 关闭动态方法调用 actionid!方法名.action -->
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <!-- 启用开发模式 -->
    <constant name="struts.devMode" value="true" />
    <!-- action的创建由spring来完成,而不由struts完成. -->
    <constant name="struts.objectFactory" value="spring" />

    <package name="default" namespace="/" extends="json-default">

      <action name="User_*" class="userAction" method="{1}">
        <result name="success" type="json">
                <param name="root">
                    jsonModel
                </param>
            </result>
      </action>
    </package>

</struts>

再看UserAction之前，我们先看看一个帮助类

package com.yc.utils;
import java.io.Serializable;
public class JsonModel implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = -7830500053112045585L;
    private Integer code;
    private String message;
    private Object obj;
    public Integer getCode() {
        return code;
    }
    public void setCode(Integer code) {
        this.code = code;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public Object getObj() {
        return obj;
    }
    public void setObj(Object obj) {
        this.obj = obj;
    }



}

通过这个帮助类将数据转为JSON数据发给前台,具体看后面的代码

我们连接redis服务都是通过spring来完成的,所以我们看看spring 的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 启用注解解析器 -->
    <context:annotation-config />
    <!-- 因为采用了混合解析方式( 有一部分配置在xml中,有一部分在java类中，所以要让spring的注解解析器去扫描包 -->
    <context:component-scan base-package="com.yc" />
    <!-- 启用aspectj的注解方式的代理 -->
    <aop:aspectj-autoproxy />

    <!-- 创建redis工厂 -->
    <bean id="jedisFactory"
        class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="localhost" />
        <property name="port" value="6379" />
        <property name="usePool" value="true" />
    </bean>

    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="jedisFactory" />
        <property name="keySerializer">  
            <bean  
                class="org.springframework.data.redis.serializer.StringRedisSerializer" />  
        </property>  
        <property name="valueSerializer">  
            <bean  
                class="org.springframework.data.redis.serializer.StringRedisSerializer" />  
        </property>
    </bean>

    <bean id="springRedisClientImpl" class="com.yc.redis.spring.clients.SpringRedisClientImpl">
        <property name="redisTemplate" ref="redisTemplate" />
    </bean>

</beans>

这样我们就可以来操作redis数据库了

再看看操作redis的帮助类，，它里面封装了我们一些基本的操作redis的方法

package com.yc.redis.spring.clients;

import java.util.Set;

public interface SpringRedisClient {
    /**
     * 存
     * @param key
     * @param value
     */
    public void setKey( String key,  String value);
    /**
     * 根据键取值
     * @param key
     * @return
     */
    public Object getKey( String key);
    /**
     * 自增
     * @param key
     */
    public void incr( String key);
    /**
     * 在上一个元素的左边存
     * @param key
     * @param value
     */
    public void lPush( String key, String value);
    /**
     * 查看是否有这个键
     * @param key
     * @return
     */
    public boolean checkKey( String key);
    /**
     * 按键取
     * @param key
     * @return
     */
    public Object lIndex( String key);
    /**
     * 求长度
     * @param key
     * @return
     */
    public Long lLength( String key);
    /**
     * 从上一个元素的左边取值
     * @param key
     * @return
     */
    public String lPop( String key);
    /**
     * 按正则表达式匹配的键取值
     * @param pattern
     * @return
     */
    public Set<String> getKeys( String pattern);


}

看看它的实现,里面通过spring注入了一个RedisTemplate,这在spring的配置文件里面已经注册了,这样就可以访问redis数据库了

package com.yc.redis.spring.clients;

import java.io.Serializable;
import java.util.Set;

import org.springframework.data.redis.core.RedisTemplate;

public class SpringRedisClientImpl implements SpringRedisClient,Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = -4213002642362857373L;
    private RedisTemplate redisTemplate;

    public void setRedisTemplate(RedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    @Override
    public void setKey(String key, String value) {
        this.redisTemplate.opsForValue().set(key, value);
    }

    @Override
    public Object getKey(String key) {
        return this.redisTemplate.opsForValue().get(key);
    }

    @Override
    public void incr(String key) {
        this.redisTemplate.opsForValue().increment(key, 1);
    }

    @Override
    public void lPush(String key, String value) {
        this.redisTemplate.opsForList().leftPush(key, value);
    }

    @Override
    public boolean checkKey(String key) {
        return this.redisTemplate.hasKey(key);
    }

    @Override
    public Object lIndex(String key) {
        return this.redisTemplate.opsForList().index(key, 0);
    }

    @Override
    public Long lLength(String key) {
        return this.redisTemplate.opsForList().size(key);
    }

    @Override
    public String lPop(String key) {
        return (String) this.redisTemplate.opsForList().leftPop(key);
    }

    @Override
    public Set<String> getKeys(String pattern) {
        return this.redisTemplate.keys(pattern);
    }

}

首先看看业务层,定义了三个接口方法，分别是顶，踩和刷新时查找顶和踩的数量

package com.yc.service;
public interface UserService {
    public String Ding();
    public String Cai() ;
    public String[] Find() ;
}

下面看它的实现类

package com.yc.service.impl;

import java.io.Serializable;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


import com.yc.redis.spring.clients.SpringRedisClientImpl;
import com.yc.service.UserService;

import redis.clients.jedis.Jedis;
@Service("userServiceImpl")
public class UserServiceImpl implements UserService ,Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1304876423677235894L;
    @Autowired
    private SpringRedisClientImpl springRedisClientImpl;//通过spring注入

    @Override
    public String Ding() {
        springRedisClientImpl.incr("User:ding");
        String num=(String) springRedisClientImpl.getKey("User:ding");
        return num;
    }


    public SpringRedisClientImpl getSpringRedisClientImpl() {
        return springRedisClientImpl;
    }


    public void setSpringRedisClientImpl(SpringRedisClientImpl springRedisClientImpl) {
        this.springRedisClientImpl = springRedisClientImpl;
    }

    @Override
    public String Cai() {
        springRedisClientImpl.incr("User:cai");
        String num=(String) springRedisClientImpl.getKey("User:cai");
        return num;
    }

    @Override
    public String[] Find() {
        String s[]=new String[2];
        s[0]= (String) springRedisClientImpl.getKey("User:ding");
        s[1]= (String) springRedisClientImpl.getKey("User:cai");
        return s;
    }
}

最后大家可以看UserAction类了

package com.yc.web.actions;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import com.opensymphony.xwork2.ActionSupport;
import com.yc.beans.User;
import com.yc.service.UserService;
import com.yc.service.impl.UserServiceImpl;
import com.yc.utils.JsonModel;
import com.yc.utils.JsonModel;

import redis.clients.jedis.Jedis;
@Controller("userAction")
public class UserAction extends ActionSupport {

    /**
     * 
     */
    private static final long serialVersionUID = 1825223373127715747L;
    private JsonModel jsonModel = new JsonModel();
    @Autowired
    private UserServiceImpl userServiceImpl;


    public JsonModel getJsonModel() {
        return jsonModel;
    }

    public void setJsonModel(JsonModel jsonModel) {
        this.jsonModel = jsonModel;
    }

    public String Ding() {
        User user = new User();
        String num = userServiceImpl.Ding();
        if (num != null && !"".equals(num)) {
            user.setDing(Integer.parseInt(num));
            jsonModel.setCode(1);
            jsonModel.setObj(user);
        }
        return SUCCESS;
    }

    public String Cai() {
        User user = new User();
        String num = userServiceImpl.Cai();
        if (num != null && !"".equals(num)) {
            user.setCai(Integer.parseInt(num));
            jsonModel.setCode(1);
            jsonModel.setObj(user);
        }
        return SUCCESS;
    }

    public String Find() {
        User user = new User();
        System.out.println(userServiceImpl);
        String num[] = userServiceImpl.Find();
        user.setDing(Integer.parseInt(num[0]));
        user.setCai(Integer.parseInt(num[1]));
        jsonModel.setCode(1);
        jsonModel.setObj(user);
        return SUCCESS;

    }
}

这样所有的代码就都已经分析完了,搭建好redis服务后,就可以跑了，
整个项目的代码有需要的朋友可以下载
http://download.csdn.net/detail/tanggao1314/9487851

码农公寓

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