• Shiro+Redis实现tomcat集群session共享


     

     

    一、背景

      当我们使用了nginx做项目集群以后,就会出现一个很严重的问题亟待解决,那就是:tomcat集群之间如何实现session共享的问题,如果这个问题不解决,就会出现登陆过后再次请求资源依旧需要登陆的问题。这篇文章我们就解决这个问题。

    二、实现步骤

    说明:本篇是在spring+shiro集成的基础上进行改进的,如果不知道spring和shiro怎么集成,请移步:spring集成shiro做登陆认证

    1.在pom.xml中添加shiro-redis和jedis的依赖

    <dependency>
         <groupId>org.crazycake</groupId>
         <artifactId>shiro-redis</artifactId>
         <version>2.4.2.1-RELEASE</version>
    </dependency>
    <dependency>
         <groupId>redis.clients</groupId>
         <artifactId>jedis</artifactId>
          <version>2.7.2</version>
    </dependency>

    2.首先我们需要对redis进行集成,在resources下新建config.properties

    #redis pool config
    redis.pool.maxActive=200
    redis.pool.maxIdle=100
    redis.pool.maxWait=100
    redis.pool.testOnBorrow=true
    
    #redis config
    redis.host=192.168.85.129
    redis.port=6379
    redis.timeout=2000
    redis.password=123456
    redis.dbindex=8
    redis.default.expire=1800000

    3.在resources/spring文件夹下新建spring-redis.xml来集成redis操作客户端

    <?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">
    
        <description>Redis configuration</description>
    
        <bean id="redisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
            <property name="maxTotal" value="${redis.pool.maxActive}"/>
            <property name="maxIdle" value="${redis.pool.maxIdle}"/>
            <property name="maxWaitMillis" value="${redis.pool.maxWait}"/>
            <property name="testOnBorrow" value="${redis.pool.testOnBorrow}"/>
        </bean>
    
        <bean id="jedisPool" class="redis.clients.jedis.JedisPool" destroy-method="destroy">
            <constructor-arg ref="redisPoolConfig"/>
            <constructor-arg value="${redis.host}"/>
            <constructor-arg type="int" value="${redis.port}"/>
            <constructor-arg type="int" value="${redis.timeout}"/>
            <constructor-arg type="java.lang.String" value="${redis.password}"/>
            <constructor-arg type="int" value="${redis.dbindex}"/>
        </bean>
    
        <bean id="redisClient" class="com.hafiz.www.redis.RedisClient">
            <constructor-arg name="jedisPool" ref="jedisPool"/>
            <property name="expire" value="${redis.default.expire}"/>
        </bean>
    </beans>

    4.添加redisClient.java作为访问redis的客户端

    package com.hafiz.www.redis;
    
    import org.crazycake.shiro.RedisManager;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.JedisPool;
    
    import java.util.Set;
    
    /**
     * Desc: Jedis 操作客户端
     * Created by hafiz.zhang on 2017/7/21.
     */
    public class RedisClient extends RedisManager{
    
        private static final Logger LOGGER = LoggerFactory.getLogger(RedisClient.class);
    
        private static JedisPool jedisPool = null;
    
        public RedisClient(JedisPool jedisPool) {
            this.jedisPool = jedisPool;
        }
    
        public void init() {
            super.init();
        }
    
        @Override
        public byte[] get(byte[] key) {
            Jedis jedis = jedisPool.getResource();
            byte[] value;
    
            try {
                value = jedis.get(key);
            } catch (Exception e) {
                LOGGER.error("redis key:{} get value occur exception", new String(key));
                throw new RuntimeException("redis operation error:", e);
            } finally {
                jedis.close();
            }
    
            return value;
        }
    
        @Override
        public byte[] set(byte[] key, byte[] value) {
            Jedis jedis = jedisPool.getResource();
    
            try {
                jedis.set(key, value);
                Integer expire = getExpire();
                if(expire != 0) {
                    jedis.expire(key, expire);
                }
            } catch (Exception e) {
                LOGGER.error("redis key:{} set value:{} occur exception", new String(key), new String(value));
                throw new RuntimeException("redis operation error:", e);
            } finally {
                jedis.close();
            }
    
            return value;
        }
    
        @Override
        public byte[] set(byte[] key, byte[] value, int expire) {
            Jedis jedis = jedisPool.getResource();
    
            try {
                jedis.set(key, value);
                if(expire != 0) {
                    jedis.expire(key, expire);
                }
            } catch (Exception e) {
                LOGGER.error("redis key:{} set value:{} in expire:{} occur exception", new String(key), new String(value), expire);
                throw new RuntimeException("redis operation error:", e);
            } finally {
                jedis.close();
            }
    
            return value;
        }
    
        @Override
        public void del(byte[] key) {
            Jedis jedis = jedisPool.getResource();
    
            try {
                jedis.del(key);
            } catch (Exception e) {
                LOGGER.error("redis key:{} del value occur exception", new String(key));
                throw new RuntimeException("redis operation error:", e);
            } finally {
                jedis.close();
            }
        }
    
        @Override
        public void flushDB() {
            Jedis jedis = jedisPool.getResource();
    
            try {
                jedis.flushDB();
            } catch (Exception e) {
                LOGGER.error("redis flushDB occur exception");
                throw new RuntimeException("redis operation error:", e);
            } finally {
                jedis.close();
            }
    
        }
    
        @Override
        public Long dbSize() {
            Long dbSize = Long.valueOf(0L);
            Jedis jedis = jedisPool.getResource();
    
            try {
                dbSize = jedis.dbSize();
            } catch (Exception e) {
                LOGGER.error("redis get dbSize occur exception");
                throw new RuntimeException("redis operation error:", e);
            } finally {
                jedis.close();
            }
    
            return dbSize;
        }
    
        @Override
        public Set<byte[]> keys(String pattern) {
            Set keys = null;
            Jedis jedis = jedisPool.getResource();
    
            try {
                keys = jedis.keys(pattern.getBytes());
            } catch (Exception e) {
                LOGGER.error("redis get keys in pattern:{} occur exception", pattern);
                throw new RuntimeException("redis operation error:", e);
            } finally {
                jedis.close();
            }
    
            return keys;
        }
    }

    5.接着,我们对spring-shiro.xml做如下修改(红色标记的部分)

    <?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: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/util
            http://www.springframework.org/schema/util/spring-util.xsd">
    
        <description>Shiro Configuration</description>
    
        <!--shiro-redis redisCacheManager-->
        <bean id="redisCacheManager" class="org.crazycake.shiro.RedisCacheManager">
            <property name="keyPrefix" value="shiro_redis_session:"/>
            <property name="redisManager" ref="redisClient"/>
        </bean>
    
        <!--custom myself realm-->
        <bean id="customRealm" class="com.hafiz.www.shiro.CustomRealm">
            <property name="cacheManager" ref="redisCacheManager"/>
        </bean>
    
        <!--redisSessionDAO-->
        <bean id="redisSessionDAO" class="org.apache.shiro.session.mgt.eis.EnterpriseCacheSessionDAO"></bean>
    
    
        <!--simpleCookie,不定义在集群环境下会出现There is no session with id ....-->
        <bean id="simpleCookie" class="org.apache.shiro.web.servlet.SimpleCookie">
            <constructor-arg name="name" value="custom.session"/>
            <property name="path" value="/"/>
        </bean>
    
        <!--sessionManager-->
        <bean id="sessionManager" class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">
            <property name="sessionDAO" ref="redisSessionDAO"/>
            <property name="sessionIdCookie" ref="simpleCookie"/>
        </bean>
    
        <!--Shiro`s main business-tier object for web-enable applications-->
        <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
            <property name="realm" ref="customRealm"/>
            <property name="cacheManager" ref="redisCacheManager"/>
            <property name="sessionManager" ref="sessionManager"/>
        </bean>
    
        <!--shiro filter-->
        <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
            <property name="securityManager" ref="securityManager"/>
            <property name="loginUrl" value="/login.html"/>
            <property name="successUrl" value="/index.html"/>
            <property name="unauthorizedUrl" value="/unauthorized.html"/>
            <property name="filters">
                <util:map>
                    <entry key="auth">
                        <bean class="com.hafiz.www.filter.AuthorizeFilter"/>
                    </entry>
                </util:map>
            </property>
            <property name="filterChainDefinitions">
                <value>
                    /login.json = anon
                    /logout.json = anon
                    /js/** = anon
                    / = authc
                    /** = auth
                </value>
            </property>
        </bean>
    </beans>

    6.spring.xml做如下修改

    <?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">
        
        <context:property-placeholder location="classpath:config.properties,classpath:jdbc.properties"/>
        <import resource="spring-*.xml"/>
    
    </beans>

    到此我们就完了shiro+redis实现session共享的问题,其实也很简单,其中的实现逻辑也很简单,就是shiro的拦截器会首先去redis里面获取session,作为当本次请求的session.

    其他代码以及简单测试代码不再贴出,给出github地址:https://github.com/hafizzhang/shiro-session-cluster.git

    三、总结

      通过本文,我们就完成了spring+shiro+redis实现集群session共享的问题,经过亲测可行。但有一点遗憾的地方,就是每次请求至少会有8次redis的读操作,一次写操作,这个问题还没有找到很好的解决办法,本地使用ehcahe也不太现实,因为涉及到本地缓存和redis缓存同步的问题,如果你有好的办法,欢迎讨论交流学习!

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  • 原文地址:https://www.cnblogs.com/yueguanguanyun/p/8952729.html
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