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# spring session 实现分布式 session
## 一、项目结构
分布式session 主要配置文件为spring-session.xml和web.xml，其他的配置为标准的web工程的配置。
<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session.png"/> </div>
## 二、分布式session的配置
#### 2.1 引入依赖
```xml
<!--分布式 session 相关依赖-->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
```
#### 2.2 在web.xml中配置session拦截器
```xml
<!--配置http session-->
<filter>
<filter-name>springSessionRepositoryFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSessionRepositoryFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
```
#### 2.3 创建配置文件spring- session.xml，配置redis连接
有两点需要特别说明：
1. spring-session 不仅提供了redis作为公共session存储的方案，同时也支持jdbc、mongodb、Hazelcast等作为公共session的存储；
2. 对于redis 存储方案而言，官方也提供了不止一种整合方式，这里我们选取的整合方案是jedis客户端作为连接，当然也可以使用Lettuce作为客户端连接。
```xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
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-4.1.xsd">
<context:property-placeholder location="classpath:redis.properties"/>
<!--配置 http session-->
<bean id="redisHttpSessionConfiguration"
class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
<!--session 有效期 单位秒 每次访问都会刷新有效期-->
<property name="maxInactiveIntervalInSeconds" value="1800"/>
</bean>
<!--单机版本配置redis 配置-->
<bean id="redisStandaloneConfiguration"
class="org.springframework.data.redis.connection.RedisStandaloneConfiguration">
<constructor-arg name="hostName" value="${redis.host}"/>
<constructor-arg name="port" value="${redis.port}"/>
</bean>
<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:usePool="true">
<!--单机版本配置-->
<constructor-arg name="standaloneConfig" ref="redisStandaloneConfiguration"/>
<!--集群配置-->
<!--<constructor-arg name="clusterConfig" ref="redisClusterConfiguration"/>-->
</bean>
<!--集群配置-->
<!--<bean id="redisClusterConfiguration" class="org.springframework.data.redis.connection.RedisClusterConfiguration">
<property name="maxRedirects" value="3"/>
<constructor-arg>
<set>
<value>127.0.0.1:6379</value>
<value>127.0.0.1:6380</value>
<value>127.0.0.1:6381</value>
</set>
</constructor-arg>
</bean>-->
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"
p:connection-factory-ref="jedisConnectionFactory"/>
</beans>
```
## 三、验证分布式session
#### 3.1 创建测试controller和测试页面
```java
@Controller
public class LoginController {
@RequestMapping
public String index(){
return "index";
}
@RequestMapping("home")
public String home(){
return "home";
}
@PostMapping("login")
public String login(User user, HttpSession session, HttpServletRequest request, Model model){
// 随机生成用户id
user.setUserId(Math.round(Math.floor(Math.random() *10*1000)));
// 将用户信息保存到id中
session.setAttribute("USER",user);
return "redirect:home";
}
}
```
登录页面：
```jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录页面</title>
</head>
<body>
<h5>服务器:<%=request.getServerName()+":"+request.getServerPort()%></h5>
<form action="${pageContext.request.contextPath}/login" method="post">
用户：<input type="text" name="username"><br/>
密码：<input type="password" name="password"><br/>
<button type="submit">登录</button>
</form>
</body>
</html>
```
session 信息展示页面(home.jsp)：
```jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>主页面</title>
</head>
<body>
<h5>服务器:<%=request.getServerName()+":"+request.getServerPort()%></h5>
<h5>登录用户: ${sessionScope.USER.username} </h5>
<h5>用户编号: ${sessionScope.USER.userId} </h5>
</body>
</html>
```
#### 3.2 启动项目
这里我们采用两个tomcat分别启动项目，在第一个项目index.jsp页面进行登录，第二个项目不登录，直接访问session展示页（home.jsp）
tomcat 1 配置：
<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-tomcat01.png"/> </div>
tomcat 2 配置：
<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-tomcat02.png"/> </div>
**测试结果：**
<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-8080.png"/> </div>
<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-8090.png"/> </div>

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.heibaiying</groupId>
<artifactId>spring-session</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<spring-base-version>5.1.3.RELEASE</spring-base-version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring-base-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring-base-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring-base-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring-base-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring-base-version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.0</version>
</dependency>
<!--分布式 session 相关依赖-->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
</dependencies>
</project>

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package com.heibaiying.bean;
import lombok.Data;
import java.io.Serializable;
/**
* @author : heibaiying
*/
@Data
public class User implements Serializable {
private long userId;
private String username;
private String password;
}

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package com.heibaiying.controller;
import com.heibaiying.bean.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
/**
* @author : heibaiying
* @description : 登录
*/
@Controller
public class LoginController {
@RequestMapping
public String index(){
return "index";
}
@RequestMapping("home")
public String home(){
return "home";
}
@PostMapping("login")
public String login(User user, HttpSession session, HttpServletRequest request, Model model){
// 随机生成用户id
user.setUserId(Math.round(Math.floor(Math.random() *10*1000)));
// 将用户信息保存到id中
session.setAttribute("USER",user);
return "redirect:home";
}
}

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redis.host=127.0.0.1
redis.port=6379
# <20><><EFBFBD>ӳ<EFBFBD>ʱʱ<CAB1><CAB1>
redis.timeout=2000
# <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
redis.maxIdle=8
# <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
redis.maxTotal=16

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
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-4.1.xsd">
<context:property-placeholder location="classpath:redis.properties"/>
<!--配置 http session-->
<bean id="redisHttpSessionConfiguration"
class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
<!--session 有效期 单位秒 每次访问都会刷新有效期-->
<property name="maxInactiveIntervalInSeconds" value="1800"/>
</bean>
<!--单机版本配置redis 配置-->
<bean id="redisStandaloneConfiguration"
class="org.springframework.data.redis.connection.RedisStandaloneConfiguration">
<constructor-arg name="hostName" value="${redis.host}"/>
<constructor-arg name="port" value="${redis.port}"/>
</bean>
<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:usePool="true">
<!--单机版本配置-->
<constructor-arg name="standaloneConfig" ref="redisStandaloneConfiguration"/>
<!--集群配置-->
<!--<constructor-arg name="clusterConfig" ref="redisClusterConfiguration"/>-->
</bean>
<!--集群配置-->
<!--<bean id="redisClusterConfiguration" class="org.springframework.data.redis.connection.RedisClusterConfiguration">
<property name="maxRedirects" value="3"/>
<constructor-arg>
<set>
<value>127.0.0.1:6379</value>
<value>127.0.0.1:6380</value>
<value>127.0.0.1:6381</value>
</set>
</constructor-arg>
</bean>-->
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"
p:connection-factory-ref="jedisConnectionFactory"/>
</beans>

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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-4.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
<!-- 开启注解包扫描-->
<context:component-scan base-package="com.heibaiying.*"/>
<!--使用默认的Servlet来响应静态文件-->
<mvc:default-servlet-handler/>
<mvc:annotation-driven/>
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!-- 后缀 -->
<property name="suffix" value=".jsp"/>
</bean>
<!--导入 spring session 的配置-->
<import resource="spring-session.xml"/>
</beans>

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>主页面</title>
</head>
<body>
<h5>服务器:<%=request.getServerName()+":"+request.getServerPort()%></h5>
<h5>登录用户: ${sessionScope.USER.username} </h5>
<h5>用户编号: ${sessionScope.USER.userId} </h5>
</body>
</html>

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录页面</title>
</head>
<body>
<h5>服务器:<%=request.getServerName()+":"+request.getServerPort()%></h5>
<form action="${pageContext.request.contextPath}/login" method="post">
用户：<input type="text" name="username"><br/>
密码：<input type="password" name="password"><br/>
<button type="submit">登录</button>
</form>
</body>
</html>

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<!--配置spring前端控制器-->
<servlet>
<servlet-name>springMvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springApplication.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--配置http session-->
<filter>
<filter-name>springSessionRepositoryFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSessionRepositoryFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--防止中文-->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>