199 lines
7.3 KiB
Markdown
199 lines
7.3 KiB
Markdown
# spring session 实现分布式 session
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## 目录<br/>
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<a href="#一项目结构">一、项目结构</a><br/>
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<a href="#二分布式session的配置">二、分布式session的配置</a><br/>
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<a href="#21-引入依赖">2.1 引入依赖</a><br/>
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<a href="#22-在webxml中配置session拦截器">2.2 在web.xml中配置session拦截器</a><br/>
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<a href="#23-创建配置文件spring--sessionxml配置redis连接">2.3 创建配置文件spring- session.xml，配置redis连接</a><br/>
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<a href="#三验证分布式session">三、验证分布式session</a><br/>
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<a href="#31-创建测试controller和测试页面">3.1 创建测试controller和测试页面</a><br/>
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<a href="#32-启动项目">3.2 启动项目</a><br/>
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## 正文<br/>
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## 一、项目结构
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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。
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session.png"/> </div>
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## 二、分布式session的配置
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#### 2.1 引入依赖
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```xml
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<!--分布式 session 相关依赖-->
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<dependency>
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<groupId>org.springframework.data</groupId>
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<artifactId>spring-data-redis</artifactId>
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<version>2.1.3.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>redis.clients</groupId>
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<artifactId>jedis</artifactId>
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<version>2.9.0</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.session</groupId>
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<artifactId>spring-session-data-redis</artifactId>
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<version>2.1.3.RELEASE</version>
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</dependency>
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```
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#### 2.2 在web.xml中配置session拦截器
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```xml
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<!--配置http session-->
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<filter>
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<filter-name>springSessionRepositoryFilter</filter-name>
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<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
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</filter>
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<filter-mapping>
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<filter-name>springSessionRepositoryFilter</filter-name>
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<url-pattern>/*</url-pattern>
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</filter-mapping>
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```
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#### 2.3 创建配置文件spring- session.xml，配置redis连接
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有两点需要特别说明：
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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；
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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。
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
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<context:property-placeholder location="classpath:redis.properties"/>
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<!--配置 http session-->
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<bean id="redisHttpSessionConfiguration"
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class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
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<!--session 有效期 单位秒 每次访问都会刷新有效期-->
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<property name="maxInactiveIntervalInSeconds" value="1800"/>
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</bean>
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<!--单机版本配置redis 配置-->
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<bean id="redisStandaloneConfiguration"
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class="org.springframework.data.redis.connection.RedisStandaloneConfiguration">
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<constructor-arg name="hostName" value="${redis.host}"/>
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<constructor-arg name="port" value="${redis.port}"/>
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</bean>
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<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
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p:usePool="true">
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<!--单机版本配置-->
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<constructor-arg name="standaloneConfig" ref="redisStandaloneConfiguration"/>
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<!--集群配置-->
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<!--<constructor-arg name="clusterConfig" ref="redisClusterConfiguration"/>-->
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</bean>
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<!--集群配置-->
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<!--<bean id="redisClusterConfiguration" class="org.springframework.data.redis.connection.RedisClusterConfiguration">
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<property name="maxRedirects" value="3"/>
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<constructor-arg>
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<set>
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<value>127.0.0.1:6379</value>
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<value>127.0.0.1:6380</value>
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<value>127.0.0.1:6381</value>
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</set>
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</constructor-arg>
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</bean>-->
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<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"
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p:connection-factory-ref="jedisConnectionFactory"/>
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</beans>
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```
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## 三、验证分布式session
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#### 3.1 创建测试controller和测试页面
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```java
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@Controller
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public class LoginController {
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@RequestMapping
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public String index(){
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return "index";
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}
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@RequestMapping("home")
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public String home(){
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return "home";
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}
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@PostMapping("login")
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public String login(User user, HttpSession session, HttpServletRequest request, Model model){
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// 随机生成用户id
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user.setUserId(Math.round(Math.floor(Math.random() *10*1000)));
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// 将用户信息保存到id中
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session.setAttribute("USER",user);
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return "redirect:home";
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}
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}
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```
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登录页面：
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```jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<html>
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<head>
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<title>登录页面</title>
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</head>
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<body>
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<h5>服务器:<%=request.getServerName()+":"+request.getServerPort()%></h5>
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<form action="${pageContext.request.contextPath}/login" method="post">
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用户：<input type="text" name="username"><br/>
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密码：<input type="password" name="password"><br/>
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<button type="submit">登录</button>
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</form>
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</body>
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</html>
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```
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session 信息展示页面(home.jsp)：
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```jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<html>
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<head>
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<title>主页面</title>
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</head>
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<body>
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<h5>服务器:<%=request.getServerName()+":"+request.getServerPort()%></h5>
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<h5>登录用户: ${sessionScope.USER.username} </h5>
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<h5>用户编号: ${sessionScope.USER.userId} </h5>
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</body>
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</html>
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```
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#### 3.2 启动项目
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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）
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tomcat 1 配置：
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-tomcat01.png"/> </div>
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tomcat 2 配置：
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-tomcat02.png"/> </div>
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**测试结果：**
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-8080.png"/> </div>
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-session-8090.png"/> </div> |