redis之监听过期key

一、创建监听配置类  RedisListenerConfig。

package com.example.redisdemo.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;

@Configuration
public class RedisListenerConfig {
    @Bean
    public RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        return container;
    }
}

二、 创建监听器： RedisKeyExpirationListener 继承  KeyExpirationEventMessageListener .

这里只能获取到 过期的key，无法获取过期的value. 

package com.example.redisdemo.redisListen;

import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.stereotype.Component;

@Component
public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {
    public RedisKeyExpirationListener(RedisMessageListenerContainer listenerContainer) {
        super(listenerContainer);
    }

    //拿到过期key的信息并做处理
    @Override
    public void onMessage(Message message, byte[] pattern) {
        String key = message.toString();
        System.out.println("过期的KEY是: " + key);
    }
}

三、在redis中创建测试数据，并设置过期时间

待key过期，控制台打印过期key信息: