分布式session之Spring session+redis

给Spring session配置基于redis来存储session数据，然后配置了一个Spring session的过滤器，这样的话，session相关操作都会交给Spring session来管了，接着在代码中，就用原生的session操作，就是基于Spring session从redis中获取数据了。

导入依赖

<!--spring 版本-->
    <spring.version>5.0.2.RELEASE</spring.version>
    <spring.session.data.redis.version>1.3.1.RELEASE</spring.session.data.redis.version>
    <lettuce.version>3.5.0.Final</lettuce.version>


<!-- spring web包 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework.session</groupId>
      <artifactId>spring-session-data-redis</artifactId>
      <version>${spring.session.data.redis.version}</version>
    </dependency>
    <dependency>
      <groupId>biz.paluch.redis</groupId>
      <artifactId>lettuce</artifactId>
      <version>${lettuce.version}</version>
    </dependency>

编写redis配置文件

redis.host=192.168.80.22
redis.pass=myredis
redis.port=6379
redis.session.timeout=600

编写spring配置文件

<?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:p="http://www.springframework.org/schema/p"
       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:annotation-config />

    <!-- 加载properties文件 -->
    <bean id="configProperties"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:session-redis.properties</value>
            </list>
        </property>
    </bean>

    <!-- RedisHttpSessionConfiguration -->
    <bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
        <!-- session过期时间,单位是秒 -->
        <property name="maxInactiveIntervalInSeconds" value="${redis.session.timeout}" />
    </bean>

    <!--LettuceConnectionFactory -->
    <bean class="org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory"
            p:host-name="${redis.host}" p:port="${redis.port}" />

</beans>

配置web.xml

拦截器拦截请求后，web请求中的request已经不一样了，但是用法一样

<!--加载spring配置文件-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext-session.xml</param-value>
  </context-param>

  <!--配置监听器-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!--配置过滤器（该过滤器要配置在第一的位置）-->
  <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>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>ERROR</dispatcher>
  </filter-mapping>