集群现在越来越常见,当我们项目搭建了集群,就会产生session共享问题。因为session是保存在服务器上面的。那么解决这一问题,大致有三个方案,1.通过nginx的负载均衡其中一种ip绑定来实现(通过ip绑定服务器其中一台,就没有集群概念了);2.通过cookie备份session实现(因为cookie数据保存在客户端,不推荐;3.通过redis备份session实现(推荐);
学习本章节之前,建议依次阅读以下文章,更好的串联全文内容,如已掌握以下列出知识点,请跳过:
vSpring Session概念
Spring Session 提供了一套创建和管理 Servlet HttpSession 的方案。Spring Session 提供了集群 Session(Clustered Sessions)功能,默认采用外置的 Redis 来存储 Session 数据(不用手动存储到redis中),以此来解决 Session 共享的问题。
Spring Session 为企业级 Java 应用的 session 管理带来了革新,使得以下的功能更加容易实现:
关于更多Spring Session概念的介绍,可以看看官网Spring Session
vSpring Session整合
1.1 引入pmo.xml
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
</dependency>
1.2 创建useraccount表
CREATE TABLE `useraccount` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(255) NOT NULL,
`age` int(10) NOT NULL,
`phone` bigint NOT NULL,
`email` varchar(255) NOT NULL,
`account` varchar(100) NOT NULL UNIQUE,
`pwd` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
)ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
insert into `useraccount` values(1,'赵(dev)',23,158,'3658561548@qq.com','test001','test001');
insert into `useraccount` values(2,'钱(dev)',27,136,'3658561548@126.com','test002','test002');
insert into `useraccount` values(3,'孙(dev)',31,159,'3658561548@163.com','test003','test003');
insert into `useraccount` values(4,'李(dev)',35,130,'3658561548@sina.com','test004','test004');
select * from `useraccount`;
1.3 mapper
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.demo.dao.UserAccountMapper">
<resultMap id="BaseResultMap" type="com.demo.pojo.UserAccount">
<id column="id" jdbcType="INTEGER" property="id" />
<result column="username" jdbcType="VARCHAR" property="username" />
<result column="age" jdbcType="INTEGER" property="age" />
<result column="phone" jdbcType="BIGINT" property="phone" />
<result column="email" jdbcType="VARCHAR" property="email" />
<result column="account" jdbcType="VARCHAR" property="account" />
<result column="pwd" jdbcType="VARCHAR" property="pwd" />
</resultMap>
<sql id="Base_Column_List">
id, username, age, phone, email, account, pwd
</sql>
<select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from useraccount
where id = #{id,jdbcType=INTEGER}
</select>
<select id="getUserByAccount" parameterType="java.lang.String" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from useraccount
where account = #{account}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
delete from useraccount
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.demo.pojo.UserAccount">
insert into useraccount (id, username, age,
phone, email, account,
pwd)
values (#{id,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER},
#{phone,jdbcType=BIGINT}, #{email,jdbcType=VARCHAR}, #{account,jdbcType=VARCHAR},
#{pwd,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="com.demo.pojo.UserAccount">
insert into useraccount
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="id != null">
id,
</if>
<if test="username != null">
username,
</if>
<if test="age != null">
age,
</if>
<if test="phone != null">
phone,
</if>
<if test="email != null">
email,
</if>
<if test="account != null">
account,
</if>
<if test="pwd != null">
pwd,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
<if test="id != null">
#{id,jdbcType=INTEGER},
</if>
<if test="username != null">
#{username,jdbcType=VARCHAR},
</if>
<if test="age != null">
#{age,jdbcType=INTEGER},
</if>
<if test="phone != null">
#{phone,jdbcType=BIGINT},
</if>
<if test="email != null">
#{email,jdbcType=VARCHAR},
</if>
<if test="account != null">
#{account,jdbcType=VARCHAR},
</if>
<if test="pwd != null">
#{pwd,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.demo.pojo.UserAccount">
update useraccount
<set>
<if test="username != null">
username = #{username,jdbcType=VARCHAR},
</if>
<if test="age != null">
age = #{age,jdbcType=INTEGER},
</if>
<if test="phone != null">
phone = #{phone,jdbcType=BIGINT},
</if>
<if test="email != null">
email = #{email,jdbcType=VARCHAR},
</if>
<if test="account != null">
account = #{account,jdbcType=VARCHAR},
</if>
<if test="pwd != null">
pwd = #{pwd,jdbcType=VARCHAR},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.demo.pojo.UserAccount">
update useraccount
set username = #{username,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER},
phone = #{phone,jdbcType=BIGINT},
email = #{email,jdbcType=VARCHAR},
account = #{account,jdbcType=VARCHAR},
pwd = #{pwd,jdbcType=VARCHAR}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>
package com.demo.dao; import com.demo.pojo.UserAccount;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository; @Mapper
@Repository
public interface UserAccountMapper {
int deleteByPrimaryKey(Integer id); int insert(UserAccount record); int insertSelective(UserAccount record); UserAccount selectByPrimaryKey(Integer id); UserAccount getUserByAccount(@Param("account") String account); int updateByPrimaryKeySelective(UserAccount record); int updateByPrimaryKey(UserAccount record);
}
1.4 实体类
package com.demo.pojo; import java.io.Serializable; public class UserAccount implements Serializable {
private static final long serialVersionUID = 1L;
private Integer id; private String username; private Integer age; private Long phone; private String email; private String account; private String pwd; public Integer getId() {
return id;
} public void setId(Integer id) {
this.id = id;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username == null ? null : username.trim();
} public Integer getAge() {
return age;
} public void setAge(Integer age) {
this.age = age;
} public Long getPhone() {
return phone;
} public void setPhone(Long phone) {
this.phone = phone;
} public String getEmail() {
return email;
} public void setEmail(String email) {
this.email = email == null ? null : email.trim();
} public String getAccount() {
return account;
} public void setAccount(String account) {
this.account = account == null ? null : account.trim();
} public String getPwd() {
return pwd;
} public void setPwd(String pwd) {
this.pwd = pwd == null ? null : pwd.trim();
}
}
1.5 service层
Service
UserAccount getUserByAccount(String account);
ServiceImpl
@Override
public UserAccount getUserByAccount(String account){
return userAccountMapper.getUserByAccount(account);
}
1.6 添加session配置类
package com.demo.common; import org.springframework.context.annotation.Configuration;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession; /**
* Created by toutou on 2019/1/22.
*/
@Configuration
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 1800)
/**
* maxInactiveIntervalInSeconds: 设置 Session 失效时间,使用 Redis Session 之后,原 Boot 的 server.session.timeout 属性不再生效。
*/
public class SessionRedisConfig {
}
1.7 设置拦截器
关于拦截器不懂的话,可以看我之前的一篇文章《SpringBoot(十一)过滤器和拦截器》
/*
* 进入controller层之前拦截请求
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception {
System.out.println("MyTestInterceptor 1111111111");
Object user= request.getSession().getAttribute("useraccount");
if (user==null){
// response.sendRedirect(request.getContextPath()+"/error");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
response.getWriter().write("请先登录");
return false;
} return true;
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
// 自定义拦截器,添加拦截路径和排除拦截路径
registry.addInterceptor(myTestInterceptor).addPathPatterns("/**").excludePathPatterns("/userlogin");
}
设置全局拦截
1.8 登录/注销
package com.demo.controller; import com.demo.pojo.UserAccount;
import com.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession; /**
* Created by toutou on 2019/1/22.
*/
@RestController
public class LoginController {
@Autowired
UserService userService; @RequestMapping(value = "/userlogin")
public String Login(HttpServletRequest request, String account, String pwd)
{
UserAccount user= userService.getUserByAccount(account);
if (user!=null && user.getPwd().equals(pwd)){
request.getSession().setAttribute("useraccount",user);
return "登录成功";
} return "登录失败";
} @RequestMapping(value = "/userlogout")
public String logout (HttpServletRequest request){
HttpSession session=request.getSession();
session.removeAttribute("useraccount");
return "退出登录";
}
}
v效果演示
2.1 直接访问页面
提示:请先登录
2.2 调用登录接口
登录以后再次访问页面,提示访问成功。
2.3 退出登录
v源码地址
https://github.com/toutouge/javademosecond/tree/master/hellospringboot
作 者:请叫我头头哥
出 处:http://www.cnblogs.com/toutou/
关于作者:专注于基础平台的项目开发。如有问题或建议,请多多赐教!
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