springboot+redis 监听key过期事件

监听redis中所有过期的key,并且返回失效的key

第一步

修改redis.config中的配置,开启监听key的过期事件
默认是

notify-keyspace-events ""

修改为:

notify-keyspace-events "Ex"

第二部

自定义监听器

该监听器会在key过期时候触发

package com.lemon.move.interceptor;

import java.nio.charset.StandardCharsets;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;

public class KeyExpiredListener extends KeyExpirationEventMessageListener {

    private static final Logger LOGGER = LoggerFactory.getLogger(KeyExpiredListener.class);

    public KeyExpiredListener(RedisMessageListenerContainer listenerContainer) {
        super(listenerContainer);
    }

    @Override
    public void onMessage(Message message, byte[] pattern) {
        String channel = new String(message.getChannel(), StandardCharsets.UTF_8);
        //过期的key
        String key = new String(message.getBody(), StandardCharsets.UTF_8);
        LOGGER.info("redis key 过期：pattern={},channel={},key={}", new String(pattern), channel, key);
    }
}

@Confiugration配置

import org.springframework.beans.factory.annotation.Autowired;
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;
 
import io.javaweb.redis.listener.KeyExpiredListener;
 
@Configuration
public class RedisConfiguration {
 
	@Autowired 
	private RedisConnectionFactory redisConnectionFactory;
	
	@Bean
	public RedisMessageListenerContainer redisMessageListenerContainer() {
		RedisMessageListenerContainer redisMessageListenerContainer = new RedisMessageListenerContainer();
		redisMessageListenerContainer.setConnectionFactory(redisConnectionFactory);
		return redisMessageListenerContainer;
	}
	
	@Bean
	public KeyExpiredListener keyExpiredListener() {
		return new KeyExpiredListener(this.redisMessageListenerContainer());
	}
}

这样就可以启动项目监听了