redis监听key过期

引入依赖

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

配置application.yml文件

spring:
  data:
    redis:
      # 地址
      host: 127.0.0.1
      # 端口
      port: 6379
      # 数据库索引
      database: 8
      # 密码
      password: root
      # 连接超时时间
      timeout: 10s
      lettuce:
        pool:
          # 连接池中的最小空闲连接
          min-idle: 0
          # 连接池中的最大空闲连接
          max-idle: 8
          # 连接池的最大数据库连接数
          max-active: 8
          # #连接池最大阻塞等待时间（使用负值表示没有限制）
          max-wait: -1ms

配置类RedisConfig

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
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.core.script.DefaultRedisScript;
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
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {

    @Bean
    @SuppressWarnings(value = {"unchecked", "rawtypes"})
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        FastJsonRedisSerializer serializer = new FastJsonRedisSerializer(Object.class);
        // 使用StringRedisSerializer来序列化和反序列化redis的key值
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(serializer);
        // Hash的key也采用StringRedisSerializer的序列化方式
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(serializer);
        template.afterPropertiesSet();
        return template;
    }

	@Bean
	RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory) {
    	RedisMessageListenerContainer container = new RedisMessageListenerContainer();
    	container.setConnectionFactory(connectionFactory);
    	return container;
	}
    /**
     * 限流脚本
     */
    @Contract(pure = true)
    private @NotNull String limitScriptText() {
        return "local key = KEYS[1]\n" +
                "local count = tonumber(ARGV[1])\n" +
                "local time = tonumber(ARGV[2])\n" +
                "local current = redis.call('get', key);\n" +
                "if current and tonumber(current) > count then\n" +
                "    return tonumber(current);\n" +
                "end\n" +
                "current = redis.call('incr', key)\n" +
                "if tonumber(current) == 1 then\n" +
                "    redis.call('expire', key, time)\n" +
                "end\n" +
                "return tonumber(current);";
    }
}

监听组件RedisKeyExpirationListener

import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;

/**
 * redis过期监听组件
 */
@Component
@Slf4j
public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {

    @Override
    public void onMessage(Message message, byte[] pattern) {
        try{
            // 过期key
            String expiredKey = message.toString();
            log.info("过期的key是: {}",expiredKey);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

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

修改redis.conf 配置文件

1. 打开redis.conf文件,找到notify-keyspace-events,默认是""
   
2. 其修改为notify-keyspace-events Ex