spingMVC+mybatis+spring-session共享内存配置

1. redis依赖：

<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
<version>${redis.version}</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.8.1</version>
</dependency>

org.springframework.session 会自动引入 spring-data-redis

2. web.xml配置：

     <!--session过滤器-->
     <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>

3. spring-redis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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- session设置 -->
    <bean id="redisHttpSessionConfiguration"
      class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
            <property name="maxInactiveIntervalInSeconds" value="600"/>
    </bean>
    <!-- redis连接池 -->
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal" value="100" />
        <property name="maxIdle" value="10" />
    </bean>
     <!-- redis连接工厂 -->
    <bean id="jedisConnectionFactory"
          class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" destroy-method="destroy">
        <property name="hostName" value="${redis_hostName}"/>
        <property name="port" value="${redis_port}"/>
        <property name="password" value="${redis_password}" />
        <property name="timeout" value="3000"/>
        <property name="usePool" value="true"/>
        <property name="poolConfig" ref="jedisPoolConfig"/>
    </bean>
</beans>

maxInactiveIntervalInSeconds 这里配置session的过期时间，单位为秒，默认是1800半个小时。

4. applicationContext.xml引入spring-redis.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"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

        <!-- 加载属性配置文件 -->
        <!-- 方式一
        <context:property-placeholder location="classpath:jdbc.properties"/>-->
        <!-- 方式二 -->
        <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
            <property name="locations">
                <list>
                    <!--要是有多个配置文件，只需在这里继续添加即可 -->
                   <value>classpath:jdbc.properties</value>
                   <value>classpath:redis.properties</value>
                </list>
            </property>
        </bean>

        <!-- 配置数据源 -->
        <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
            <property name="driverClassName" value="${jdbc.driverClassName}"/>
            <property name="url" value="${jdbc.url}"/>
            <property name="username" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>

        <!--配置事务管理器 -->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <!-- 注入数据源 -->
            <property name="dataSource" ref="dataSource"/>
        </bean>

        <!-- 自动扫描了所有的XxxxMapper.xml对应的mapper接口文件，这样就不用一个一个手动配置Mpper的映射了，只要Mapper接口类和Mapper映射文件对应起来就可以了。 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="com.ssm.dao" />
        </bean>

        <!-- 配置mybatis -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
            <!-- mapperLocations指定mapper.xml文件位置 -->
            <property name="mapperLocations" value="classpath:mapper/*Mapper.xml"/>
            <!-- configLocation指定mybatis配置文件位置 -->
            <property name="configLocation" value="classpath:mybatis-config.xml" />
            <!-- 实体别名 -->
            <property name="typeAliasesPackage" value="com.ssm.domain"/>
        </bean>

        <!-- 自动扫描注解的bean -->
        <context:component-scan base-package="com.ssm.service" />

        <!-- 启用注解配置 -->
        <context:annotation-config/>
        <!-- 使用事务注解 -->
        <tx:annotation-driven/>

        <!-- Spring中引入其他配置文件 -->
        <import resource="classpath*:/spring-redis.xml" />

</beans>

5. redis.properties

redis_hostName = xxx
redis_port = 6379
redis_password = xxxx
redis_timeout = 20000

6. 这样配置之后，对于Nginx+多台Tomcat的集群而言，多台tomcat使用的session就是基于redis缓存实现的session，当某台Tomcat挂了时，原来访问这台Tomcat的用户会被Nginx转发到其他Tomcat，因为JSESSIONID没有变，所以还是可以从Reids中找到原来的session，也就是说这样配置之后，session只和redis相关了，和tomcat没有关系，tomcat是否重启不影响用户的session.