springsession实现单点登录

1.创建web工程springsession-web
加入依赖

<dependencies>
    <!-- Spring Session 依赖start -->
    <dependency>
        <groupId>org.springframework.session</groupId>
        <artifactId>spring-session</artifactId>
        <version>1.3.1.RELEASE</version>
    </dependency>
    <!-- Spring Session 依赖end -->

    <!-- Spring session redis 依赖start -->
    <dependency>
        <groupId>org.springframework.session</groupId>
        <artifactId>spring-session-data-redis</artifactId>
        <version>1.3.1.RELEASE</version>
    </dependency>
    <!-- Spring session redis 依赖end -->

    <!-- spring-data-redis依赖的JAR配置start -->
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-redis</artifactId>
        <version>1.8.8.RELEASE</version>
    </dependency>
    <!-- spring-data-redis依赖的JAR配置end -->

    <!-- jedis依赖的JAR配置start -->
    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>2.9.0</version>
    </dependency>
    <!-- jedis依赖的JAR配置end -->

    <!-- spring web模块依赖 start -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>5.0.0.RELEASE</version>
    </dependency>
    <!-- spring web模块依赖end -->

    <!-- servlet依赖的jar包start -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>
    <!-- servlet依赖的jar包start -->

    <!-- jsp依赖jar包start -->
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.1</version>
    </dependency>
    <!-- jsp依赖jar包end -->

    <!--jstl标签依赖的jar包start -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <!--jstl标签依赖的jar包end -->
    </dependencies>

2.在web.xml中添加如下内容

<?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/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
    <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>

    <!-- needed for ContextLoaderListener -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <!-- Bootstraps the root web application context before servlet initialization -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
</web-app>

3.创建application.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
       <!--导入applicationContext.xml-session.xml-->
    <import resource="applicationContext.xml-session.xml"></import>
   
</beans>

4.创建applicationContext.xml-session.xml Spring配置文件配置一个RedisHttpSessionConfiguration类

  <?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"
       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">
<!-- spring注解、bean的处理器 -->
<context:annotation-config/>

<!-- Spring session 的配置类 -->
<bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration"/>
    <!-- 配置jedis连接工厂，用于连接redis -->
    <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="${redis.hostName}"/>
        <property name="port" value="${redis.port}"/>
        <property name="password" value="${redis.password}"/>
        <property name="usePool" value="${redis.usePool}"/>
        <property name="timeout" value="${redis.timeout}"/>
    </bean>

    <!--读取redis.properties属性配置文件-->
    <context:property-placeholder location="classpath:redis.properties"/>
</beans>

5、Spring配置文件配置Spring-data-redis

redis.hostName=127.0.0.1
redis.port=6379
redis.timeout=15

6.新建2个serlvet

package com.hbsc.session;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URL;

public class GetSessionServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req,resp);
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       String address =  (String) request.getSession().getAttribute("url");
        response.getWriter().print(address==null?"nosession": address);

    }
}


package com.hbsc.session;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SetSessionServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req,resp);
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       request.getSession().setAttribute("url","http://www.baidu.com");
       response.getWriter().print("OK");

    }
}

注意要在web.xml中配置servlet部署web项目的时候注意web项目名字一样