SpringBoot Redis key失效監控 使用

利用Redis的key失效監控來處理業務，例如，訂單30分鍾定時取消。

1、redis.conf 配置文件中 添加配置

notify-keyspace-events Ex

2、代碼如下

　　1、啟動類添加注解 

@ComponentScan

　　2、添加Container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.core.RedisTemplate;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisListenerConfig {

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 處理亂碼
     *
     * @return
     */
    @Bean
    public RedisTemplate redisTemplateInit() {
        // key序列化
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        //val實例化
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }

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

　　3、失效key監控

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

import javax.annotation.Resource;

@Component
public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {

    @Resource
    private RedisTemplate redisTemplate;

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

    /**
     * 針對redis數據失效事件，進行數據處理
     *
     * @param message
     * @param pattern
     */
    @Override
    public void onMessage(Message message, byte[] pattern) {
        String expireKey = new String(message.getBody());
        System.out.println("body = [" + expireKey + "]");
    }
}