开箱即用之 redis键值失效通知后端进行业务操作

引入redis依赖

XML 复制代码

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

配置类编写

java 复制代码

import com.alibaba.fastjson.support.spring.FastJsonRedisSerializer;
import com.bwss.ai.common.listener.RedisKeyExpireListener;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
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.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import javax.annotation.Resource;

/**
 * @Description redis配置
 **/
@Configuration
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
public class RedisConfig
{
    @Resource
    private RedisKeyExpireListener redisListen;

    @Bean
    @ConditionalOnMissingBean(name = "redisTemplate")
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory)
    {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        //使用fastjson序列化
        FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<>(Object.class);
        // value值的序列化采用fastJsonRedisSerializer
        template.setValueSerializer(fastJsonRedisSerializer);
        template.setHashValueSerializer(fastJsonRedisSerializer);
        // key的序列化采用StringRedisSerializer
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }

    @Bean
    @ConditionalOnMissingBean(StringRedisTemplate.class)
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory)
    {
        StringRedisTemplate template = new StringRedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }

    /**
     * 开启监听redis Key过期事件
     */
    @Bean
    public RedisMessageListenerContainer redisMessageListenerContainer(RedisConnectionFactory connectionFactory)
    {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.addMessageListener(redisListen, new PatternTopic("__keyevent@*__:expired"));
        return container;
    }
}

监听类编写

java 复制代码

import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;
import org.springframework.stereotype.Component;

/**
 * @Description redis过期监听器
 **/
@Slf4j
@Component
public class RedisKeyExpireListener implements MessageListener {

    @Override
    public void onMessage(Message message, byte[] pattern)
    {
        String expireKey = message.toString();
        // 根据过期的key处理对应的业务逻辑
        log.info(expireKey + "已过期-------------------");
    }
}

redis配置文件修改

修改redis.conf配置文件，找到 EVENT NOTIFICATION （事件通知）这个配置（默认关闭），这个好像要搞版本才能使用

XML 复制代码

notify-keyspace-events Ex

测试

java 复制代码

 // 将更新状态存放进redis
String logKey = "test"
redisTemplate.opsForValue().set(logKey, "",30, TimeUnit.SECONDS);