引入 jedis

<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>3.5.1</version>
        </dependency>

java代码

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPubSub;

import java.util.List;

public class Main {
    public static void main(String[] args) {
        JedisPool pool = new JedisPool("127.0.0.1");
        //订阅过期事件
        new Thread(() -> {
            Jedis jedis = pool.getResource();
            String parameter = "notify-keyspace-events";
            List<String> notify = jedis.configGet(parameter);
            if ("".equals(notify.get(1))) jedis.configSet(parameter, "Ex");
            
            jedis.psubscribe(new MyJedisPubSub(), "__keyevent@0__:expired");
        }).start();
        
        //储存数据 5秒后过期
        new Thread(() -> pool.getResource().setex("key", 5, "hello word")).start();
    }
}

/**
 * 事件回调
 */
class MyJedisPubSub extends JedisPubSub {
    @Override
    public void onPSubscribe(String pattern, int subscribedChannels) {
        System.out.println("订阅事件-> "
                + pattern + " " + subscribedChannels);
    }

    @Override
    public void onPMessage(String pattern, String channel, String key) {
        System.out.println("收到消息-> "
                + pattern + " " + channel + " " + key);
    }
}