Spring Session + redis實現session共享

• 新建maven項目，Archetype選擇maven-archetype-webapp類型。項目結構以下：

• 修改pom.xml

<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.session</groupId>
			<artifactId>spring-session-data-redis</artifactId>
			<version>1.2.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>redis.clients</groupId>
			<artifactId>jedis</artifactId>
			<version>2.8.1</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>4.2.5.RELEASE</version>
		</dependency>
		<dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-webmvc</artifactId>  
            <version>4.2.5.RELEASE</version>  
        </dependency>
        <dependency>  
            <groupId>javax.servlet</groupId>  
            <artifactId>jstl</artifactId>  
            <version>1.1.2</version>  
        </dependency>  
        <dependency>  
            <groupId>log4j</groupId>  
            <artifactId>log4j</artifactId>  
            <version>1.2.14</version>  
        </dependency> 
	</dependencies>

• 修改web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	metadata-complete="true">
        <display-name>Archetype Created Web Application</display-name>
  
        <context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/applicationContext.xml</param-value>
	</context-param>
	<context-param>
		<param-name>log4jConfigLocation</param-name>
		<param-value>WEB-INF/log4j.properties</param-value>
	</context-param>

	<listener>
		<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
	</listener>

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

	<listener>
		<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
	</listener>

	<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>

	<servlet>
		<servlet-name>testredis</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>testredis</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	
	<session-config>
		<session-timeout>2</session-timeout>
	</session-config>
</web-app>

• 在WEB-INF下新建spring配置文件applicationContext.xml，並配置redis信息。

<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

	<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
		<property name="maxTotal" value="30" />
		<property name="maxIdle" value="10" />
		<property name="minIdle" value="1" />
		<property name="maxWaitMillis" value="30000" />
		<property name="testOnBorrow" value="true" />
		<property name="testOnReturn" value="false" />
		<property name="testWhileIdle" value="false" />
	</bean>

	<context:annotation-config />

	<bean id="redisHttpSessionConfiguration"
		class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
		<property name="maxInactiveIntervalInSeconds" value="600" />
	</bean>

	<bean id="jedisConnectionFactory"
		class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
		destroy-method="destroy">
		<property name="hostName" value="192.168.129.134" />
		<property name="port" value="6379" />
		<property name="timeout" value="3000" />
		<property name="usePool" value="true" />
		<property name="poolConfig" ref="jedisPoolConfig" />
	</bean>

	<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
		<property name="connectionFactory" ref="jedisConnectionFactory" />
	</bean>
</beans>

• 所有配置完成，如下爲測試部分代碼；

1. login.jsp頁面輸入name

<form role="form" action="login">  
        <input type="text" name="username" class="form-control" placeholder="請輸入用戶名" required autofocus>  
        <button class="btn btn-lg btn-primary btn-block" type="submit">登錄</button>  
      </form>

2.controller接受請求將name保存到session

@Controller
public class TestControll {
	@RequestMapping("/login")
    public String login(HttpServletRequest request){
		String username = request.getParameter("username");
		request.getSession().setAttribute("username", username);
        return "redirect:/sessioninfo";
    }
	
	@RequestMapping("/sessioninfo")
    public String sessioninfo(){
		return "sessioninfo";
	}
}

3.sessioninfo.jsp從session中獲取name並輸出。

<%String s = session.getId(); //獲取session ID號  %>
	<%=s %>
	
	<%String username = (String)session.getAttribute("username"); //獲取session ID號  %>
	<br/>
	<%=username %>

• 將項目打包分別部署到兩個tomcat下，同一臺服務器記得注意修改端口以避免衝突
• 使用瀏覽器訪問tomcatA輸入用戶名提交後記錄下輸出的sessionId，直接訪問tomcatB的sessioninfo頁面對比輸出的sessionid是否一致
• 也可打開redis-cli，使用keys *查看保存的session

下載項目所有源碼