CAS Client集群环境的Session问题及解决方案 不能退出登录

casclient源代码下载链接：https://github.com/apereo/java-cas-client

cas官网链接：https://www.apereo.org/projects/cas

1.上面一篇引用别人的分析方案介绍，来描述了下项目中遇到的问题，现在介绍本人怎么解决的

2.本人项目中用的是改造了tomcat 做的session 共享

3.所以客户端请求退出，服务端根据TGT查看对应的ST进行请求客户端，通过nginx负载均衡，可能对应到另一台客户端服务器，但是我们的session是存入rediscluster，任意客户端可以根据sessionid取到这个，进行删除，这样session就没了。即在客户端配置的SingleSignOutFilter，需要在HashMapBackedSessionMappingStorage进行删除存入redis的session数据，这样就可以退出了，就是这个原理来处理这个退出登录问题

一.上代码依赖jar包

spring-data-redis-1.7.4.RELEASE.jar；jedis-2.9.0.jar；fastjson-1.2.31.jar；注意jar包版本

二.改造的HashMapBackedSessionMappingStorage类代码

package org.jasig.cas.client.session;

/*
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Jasig licenses this file to you under the Apache License,
 * Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License.  You may obtain a
 * copy of the License at the following location:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import org.jasig.cas.client.session.SessionMappingStorage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.EnableMBeanExport;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

/**
 * HashMap backed implementation of SessionMappingStorage.
 *
 * @author Scott Battaglia
 * @version $Revision$ $Date$
 * @since 3.1
 *
 */
public final class HashMapBackedSessionMappingStorage implements SessionMappingStorage {

	  protected final transient Logger logger = LoggerFactory.getLogger(getClass());

	 private final static String CASCLIENT_PREFIX = "CASCLI:SESSIONID:";
	 private final static String CASCLIENT_MAPID_PREFIX = "CASCLI:MAPID:";

	 private int casTimeout=86400;

	 private RedisTemplate redisTemplate=new RedisTemplate();

	public RedisTemplate getRedisTemplate() {
		return redisTemplate;
	}

	public void setRedisTemplate(RedisTemplate redisTemplate) {
		this.redisTemplate = redisTemplate;
	}

	public  HashMapBackedSessionMappingStorage(){
		ApplicationContext ac =new ClassPathXmlApplicationContext("classpath:schemeone/xml/spring-core.xml");
		setRedisTemplate((RedisTemplate)ac.getBean("redisTemplate"));
	 }

	@Override
	public synchronized void addSessionById(String mappingId, HttpSession session) {
	        logger.debug("Adding ticket {}", session);
	        try {
	            String sessionRedisKey = this.getCasSessionRedisKey(session.getId());
	            String mappingIdRedisKey = this.getCasMappingIdRedisKey(mappingId);
	            this.redisTemplate.boundValueOps(sessionRedisKey).set(mappingId, casTimeout, TimeUnit.SECONDS);
	            this.redisTemplate.boundValueOps(mappingIdRedisKey).set(session.getId(), casTimeout, TimeUnit.SECONDS);
	        } catch (final Exception e) {
	            logger.error("Failed Adding {}", session, e);
	        }
	}

	@Override
	public synchronized void removeBySessionById(String sessionId) {
		 logger.debug("Attempting to remove Session=[{}]", sessionId);

	        final String key =(String) this.redisTemplate.boundValueOps(this.getCasSessionRedisKey(sessionId)).get(); 

	        if (logger.isDebugEnabled()) {
	            if (key != null) {
	                logger.debug("Found mapping for session.  Session Removed.");
	            } else {
	                logger.debug("No mapping for session found.  Ignoring.");
	            }
	        }
	        this.redisTemplate.delete(this.getCasMappingIdRedisKey(key));
	        this.redisTemplate.delete(this.getCasSessionRedisKey(sessionId));
	}

	@Override
	public synchronized HttpSession removeSessionByMappingId(String mappingId) {
		//先去取sessionid
		final String sessionId=(String) this.redisTemplate.boundValueOps(this.getCasMappingIdRedisKey(mappingId)).get();
		//final HttpSession session = (HttpSession) this.redisTemplate.boundValueOps(sessionId).get();
		 this.redisTemplate.delete(sessionId);
//	        if (session != null) {
//	            removeBySessionById(session.getId());
//	        }
//	        return session;
		 if (sessionId != null) {
	            removeBySessionById(sessionId);
	        }
	        return null;
	}

	  private String getCasSessionRedisKey( String sessionId) {
	        return CASCLIENT_PREFIX + sessionId;
	    }

	  private String getCasMappingIdRedisKey(String mappingId) {
	        return CASCLIENT_MAPID_PREFIX + mappingId;
	    }

}

　　三。redistemplteBean配置

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

	<!-- 扫描注解Bean -->
	<context:component-scan base-package="com.hivescm" />

	<aop:config proxy-target-class="true" />

	<!-- 开启AOP监听 只对当前配置文件有效 -->
	<aop:aspectj-autoproxy expose-proxy="true" />

		<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
<!-- 				<value>classpath:schemeone/properties/common/*.properties</value> -->
					<value>classpath:schemeone/properties/common/redis.cluster.properties</value>
			</list>
		</property>
	</bean>
		<!--     jedis 配置 -->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig" >
<!--         最大空闲数 -->
        <property name="maxIdle" value="${redis.maxIdle}" />
<!--         最大建立连接等待时间 -->
        <property name="maxWaitMillis" value="${redis.maxWait}" />
<!--         是否在从池中取出连接前进行检验,如果检验失败,则从池中去除连接并尝试取出另一个 -->
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />
    </bean>

<!--     配置文件加载 -->
    <bean id="resourcePropertySource" class="org.springframework.core.io.support.ResourcePropertySource">
        <constructor-arg name="name" value="redis.cluster.properties"/>
        <constructor-arg name="resource" value="classpath:schemeone/properties/common/redis.cluster.properties"/>
    </bean>

<!--     redisCluster配置 -->
    <bean id="redisClusterConfiguration" class="org.springframework.data.redis.connection.RedisClusterConfiguration">
        <constructor-arg name="propertySource" ref="resourcePropertySource"/>
    </bean>

<!--     redis服务器中心 -->
    <bean id="connectionFactory"  class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" >
        <constructor-arg name="clusterConfig" ref="redisClusterConfiguration"/>
        <constructor-arg name="poolConfig" ref="poolConfig"/>
        <property name="password" value="${redis.password}" />
        <property name="timeout" value="${redis.timeout}" ></property>
    </bean >

    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate" >
        <property name="connectionFactory" ref="connectionFactory" />
<!--         如果不配置Serializer，那么存储的时候缺省使用String，如果用User类型存储，那么会提示错误User can't cast to String！！  -->
        <property name="keySerializer" >
            <bean class="org.springframework.data.redis.serializer.StringRedisSerializer" />
        </property>
        <property name="valueSerializer" >
            <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer" />
        </property>
        <property name="hashKeySerializer">
            <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/>
        </property>
        <property name="hashValueSerializer">
            <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/>
        </property>
    </bean >

</beans>

　　4.redis.cluster.properties

#redis\u4E2D\u5FC3
#redis\u7684\u670D\u52A1\u5668\u5730\u5740
redis.host=192.168.103.158
#redis\u7684\u670D\u52A1\u7AEF\u53E3
redis.port=6379
#\u5BC6\u7801
redis.password=
#\u6700\u5927\u7A7A\u95F2\u6570
redis.maxIdle=100
#\u6700\u5927\u8FDE\u63A5\u6570
redis.maxActive=300
#\u6700\u5927\u5EFA\u7ACB\u8FDE\u63A5\u7B49\u5F85\u65F6\u95F4
redis.maxWait=1000
#\u5BA2\u6237\u7AEF\u8D85\u65F6\u65F6\u95F4\u5355\u4F4D\u662F\u6BEB\u79D2
redis.timeout=100000
redis.maxTotal=1000
redis.minIdle=8
#\u660E\u662F\u5426\u5728\u4ECE\u6C60\u4E2D\u53D6\u51FA\u8FDE\u63A5\u524D\u8FDB\u884C\u68C0\u9A8C,\u5982\u679C\u68C0\u9A8C\u5931\u8D25,\u5219\u4ECE\u6C60\u4E2D\u53BB\u9664\u8FDE\u63A5\u5E76\u5C1D\u8BD5\u53D6\u51FA\u53E6\u4E00\u4E2A
redis.testOnBorrow=true

#sentinel
#spring.redis.sentinel.node1.host=127.0.0.1
#spring.redis.sentinel.node2.host=127.0.0.1
#spring.redis.sentinel.node3.host=127.0.0.1
#spring.redis.sentinel.node1.port=26379
#spring.redis.sentinel.node2.port=26479
#spring.redis.sentinel.node3.port=26579
#sentinel

#jediscluster
#cluster1.host.port=127.0.0.1:7000
#cluster2.host.port=127.0.0.1:7001
#cluster3.host.port=127.0.0.1:7002
#cluster4.host.port=127.0.0.1:7003
#cluster5.host.port=127.0.0.1:7004
#cluster6.host.port=127.0.0.1:7005
#cluster7.host.port=127.0.0.1:7006
#cluster8.host.port=127.0.0.1:7007
#jediscluster

#rediscluster
#spring.redis.cluster.nodes=192.168.103.158:6379
spring.redis.cluster.nodes=192.168.103.174:6379,192.168.103.174:6389,192.168.103.174:6399,192.168.103.173:6379,192.168.103.173:6389,192.168.103.173:6399
spring.redis.cluster.max-redirects=3