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监听redis过期的key

发布时间 2023-10-22 15:10:36作者: Tk小武

    package com.ccxgf.configuration;


import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.RequiredArgsConstructor;
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.*;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * redis配置
 */
@Configuration
@RequiredArgsConstructor
public class RedisConfig {

    private final RedisConnectionFactory factory;

    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(factory);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.setHashKeySerializer(jackson2JsonRedisSerializer);
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.setDefaultSerializer(new StringRedisSerializer());
        template.afterPropertiesSet();
        return template;
    }

    /**
     * 监听redis的过期事件
     */
    @Bean
    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        return container;
    }

    @Bean
    public HashOperations<String, String, Object> hashOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForHash();
    }

    @Bean
    public ValueOperations<String, String> valueOperations(RedisTemplate<String, String> redisTemplate) {
        return redisTemplate.opsForValue();
    }

    @Bean
    public ListOperations<String, Object> listOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForList();
    }

    @Bean
    public SetOperations<String, Object> setOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForSet();
    }

    @Bean
    public ZSetOperations<String, Object> zSetOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForZSet();
    }


}
---------------------
设置监听器
@Component
@Slf4j
public class RedisKeyExpirationHandler extends KeyExpirationEventMessageListener {

    @Autowired
    private RedisService redisService;

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

    @Override
    public void onMessage(Message message, byte[] pattern) {
        String expiredKey = message.toString(); // 获取过期的key
        log.info("移除过期redis key：{}", expiredKey);
        String id = expiredKey.substring(expiredKey.lastIndexOf(",")+1);
        redisService.del(id);
    }
}

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具体安装redis步骤：
1、springboot程序添加依赖


<!-- redis -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

 2、redis配置

@Configuration
public class RedisConfig {
@Bean
public RedisMessageListenerContainer redisMessageListenerContainer(RedisConnectionFactory redisConnectionFactory) {
RedisMessageListenerContainer redisMessageListenerContainer = new RedisMessageListenerContainer();
redisMessageListenerContainer.setConnectionFactory(redisConnectionFactory);
return redisMessageListenerContainer;
}
}

 3、application.xml

spring:
redis:
host: 39.102.60.114
port: 6379
database: 0
password: password
timeout: 1000s

 4、配置类

@Slf4j
@Component
public class RedisKeyExpireListener extends KeyExpirationEventMessageListener {

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

@Override
public void onMessage(Message message, byte[] pattern) {
log.info("接受到消息：{}，{}",message,new String(pattern));
}
}