redis监听key值过期失效

简介：

　　在redis的使用场景中，有时我们会对redis的键值进行监听，若redis的key过期，需要触发某些事件。

举例：

　　比如：用户下单成功，若三十分钟未付款，需要做某些事情。

使用前提:

　   redis版本 2.8.0+

　　修改redis.conf中的notify-keyspace-events Ex，默认为notify-keyspace-events ""
　　也可以使用执行命令：CONFIG set notify-keyspace-events Ex 　　（采用此种方法若重启redis需重新设置）

代码实现：

　　配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
       xmlns:redis="http://www.springframework.org/schema/redis"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/redis http://www.springframework.org/schema/redis/spring-redis.xsd">

    <context:component-scan base-package="com.abc.redis" />

    <!-- 开启注解 -->
    <context:annotation-config />

    <!-- scanner redis properties  -->
    <context:property-placeholder location="classpath:redis.properties" file-encoding="utf-8" ignore-unresolvable="true"/>

    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="1000" />
        <property name="maxTotal" value="10000" />
        <property name="testOnBorrow" value="true" />
    </bean>

    <bean id="redisConnectionFactory"
          class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="usePool" value="true"></property>
        <property name="hostName" value="127.0.0.1" />
        <property name="port" value="6379" />
<!--        <property name="password" value="" />-->
        <property name="timeout" value="10000" />
        <property name="database" value="1"></property>
        <constructor-arg index="0" ref="jedisPoolConfig" />
    </bean>

    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="redisConnectionFactory" />
        <property name="keySerializer" ref="stringRedisSerializer" />
        <property name="valueSerializer" ref="stringRedisSerializer" />
        <property name="hashKeySerializer" ref="stringRedisSerializer" />
        <property name="hashValueSerializer" ref="stringRedisSerializer" />
    </bean>

    <bean id="stringRedisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
        <property name="connectionFactory" ref="redisConnectionFactory" />
        <property name="keySerializer" ref="stringRedisSerializer" />
        <property name="valueSerializer" ref="stringRedisSerializer" />
        <property name="hashKeySerializer" ref="stringRedisSerializer" />
        <property name="hashValueSerializer" ref="stringRedisSerializer" />
    </bean>

    <bean id="stringRedisSerializer"
          class="org.springframework.data.redis.serializer.StringRedisSerializer" >
    </bean>

    <redis:listener-container>
        <redis:listener ref="listener" method="onMessage" topic="__keyevent@*__:expired"/>　　//监听的失效的key
        <redis:listener ref="listener2" method="onMessage" topic="www"/>
    </redis:listener-container>
    <bean id="listener" class="com.abc.redis.RedisMessageListener" />
    <bean id="listener2" class="com.abc.redis.RedisMessageListener2" />
59 </beans>

　　

　　监听类：针对于失效的key

import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @Author 
 * @Date
 */
@Service
public class RedisMessageListener implements MessageListener {


    @Resource
    private RedisTemplate redisTemplate;

    public RedisTemplate getRedisTemplate() {
        return redisTemplate;
    }

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

    public void onMessage(Message message, byte[] pattern) {
        System.out.println(new String(message.getChannel()));
    }
}

　　APP：

public class App {

    public static void main(String[] args) {
       ApplicationContext context = new ClassPathXmlApplicationContext("classpath:redis-context.xml");

        System.out.println(context);

    }
}

登录客户端命令：

　　127.0.0.1:6379> set mykey abcde
　　OK
　　127.0.0.1:6379> expire mykey 5
　　(integer) 1
　　127.0.0.1:6379> ttl mykey
　　(integer) -2
　　127.0.0.1:6379>