springboot+redis过期事件监听实现过程解析

1 修改 redis.conf配置文件：

K Keyspace events, published with keyspace@ prefix事件
E Keyevent events, published with keyevent@ prefix
g Generic commands (non-type specific) like DEL, EXPIRE, RENAME, …
$ String commands
l List commands
s Set commands
h Hash commands
z Sorted set commands
x Expired events (events generated every time a key expires)
e Evicted events (events generated when a key is evicted for maxmemory)
A Alias for g$lshzxe, so that the “AKE” string means all the events.
redis.conf 的默认的配置是：notify-keyspace-events ""
我们需要改为：notify-keyspace-events Ex
即对应上面的键的过期事件。修改玩这个重启一下redis

2 客户端来监听redis的过期事件：

@Configuration
public class RedisListenerConfig {
  @Bean
  RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory) {

    RedisMessageListenerContainer container = new RedisMessageListenerContainer();
    container.setConnectionFactory(connectionFactory);
    return container;
  }
}

3.书写一个监听器

@Slf4j
@Component
public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {
  public RedisKeyExpirationListener(RedisMessageListenerContainer listenerContainer) {
    super(listenerContainer);
  }
  @Override
  public void onMessage(Message message, byte[] pattern) {
    String expiredKey = message.toString();
    log.info("expiredKey========="+expiredKey);
  }

4.查询方法中随便加了两个表中的不同id，一个30s,一个27s。

redisUtil.set("UserId"+user.get(0).getId(),user.get(0).getId(),30);
redisUtil.set("UserInfoId"+userInfo.get(0).getId(),userInfo.get(0).getId(),27);

控制台输出：

需要注意的是：

过期监听消息中返回的是，过期的键的key值，是没有返回value的