springboot配置redis过期监听怎么配置

在Spring Boot中，可以使用Spring Data Redis来监听Redis中的键过期事件。具体操作如下：

1. 添加依赖

在pom.xml文件中添加spring-boot-starter-data-redis和spring-boot-starter-web依赖：

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

2. 配置RedisTemplate

在application.properties或application.yml文件中配置Redis连接信息和RedisTemplate：

spring:
  redis:
    host: localhost
    port: 6379
    database: 0
    password: 123456
    timeout: 10000
  cache:
    type: redis

@Configuration
public class RedisConfig {
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(factory);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return template;
    }
}

3. 配置消息监听器

创建一个Redis过期事件监听器，实现MessageListener接口，重写onMessage方法：

@Component
public class RedisKeyExpirationListener implements MessageListener {
    @Override
    public void onMessage(Message message, byte[] pattern) {
        String expiredKey = message.toString();
        // 在这里实现过期时的处理逻辑
        System.out.println("Key expired: " + expiredKey);
    }
}

4. 配置监听器容器

在配置类中创建一个RedisMessageListenerContainer对象，设置RedisConnectionFactory、MessageListenerAdapter和监听的Pattern：

@Configuration
public class RedisConfig {
    @Autowired
    private RedisKeyExpirationListener redisKeyExpirationListener;

    @Bean
    public RedisMessageListenerContainer redisMessageListenerContainer(RedisConnectionFactory factory) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(factory);
        container.addMessageListener(new MessageListenerAdapter(redisKeyExpirationListener), new PatternTopic("__keyevent@0__:expired"));
        return container;
    }
}

以上就是配置Redis过期监听的步骤，监听器容器启动后，就可以监听Redis中键的过期事件了。