假设服务端没有问题，配置没有问题。那就是SpringBoot的Redis的Lettuce出了问题， 没有空闲连接，当连接上来之后，一切正常，隔一段时间没有连接的时候，就会Spring就瘵连接池关了连接切断了，然后页面再一次请求连接的时候，客户端再重新请求连接到服务器。所以才会出现 这样的问题。才会出现 连接超时

• 配置类

  @Configuration
  @AutoConfigureAfter(RedisAutoConfiguration.class)
  public class RedisConfig {
    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuce) {
      //设置序列化
      Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
      ObjectMapper om = new ObjectMapper();
      om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
      om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
      jackson2JsonRedisSerializer.setObjectMapper(om);
  
      // 配置redisTemplate
      RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
      redisTemplate.setConnectionFactory(lettuce);
      RedisSerializer<String> stringSerializer = new StringRedisSerializer();
      // key序列化
      redisTemplate.setKeySerializer(stringSerializer);
      // value序列化
      redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
      // Hash key序列化
      redisTemplate.setHashKeySerializer(stringSerializer);
      // Hash value序列化
      redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
      redisTemplate.afterPropertiesSet();
      return redisTemplate;
    }
  }
  

解决方案：
lettuce提供了校验连接的方法，lettuce提供了校验连接的方法 只是默认没开启 开启的话是每次获取连接都会校验。可以定时校验来解决 或者开启获取连接的校验

1. 定时校验来解决

   /**
    * 每隔2秒校验异常lettuce连接是否正常，解决长期空闲lettuce连接关闭但是netty不能及时监控到的问题
    * @author Micky
    */
   @Component
   @Slf4j
   public class LettuceConnectionValidTask   {
       @Autowired
       private RedisConnectionFactory redisConnectionFactory;
       
       @Scheduled(cron="0/2 * * * * ?")
       public void task() {
           if(redisConnectionFactory instanceof LettuceConnectionFactory){
               LettuceConnectionFactory c=(LettuceConnectionFactory)redisConnectionFactory;
               c.validateConnection();
           }
       }
   }
   

2. 开启获取连接的校验

   @Component
   @Slf4j
   public class LettuceConnectionValidConfig implements InitializingBean {
       @Autowired
       private RedisConnectionFactory redisConnectionFactory;
   
       @Override
       public void afterPropertiesSet() throws Exception {
           if(redisConnectionFactory instanceof LettuceConnectionFactory){
               LettuceConnectionFactory c=(LettuceConnectionFactory)redisConnectionFactory;
               c.setValidateConnection(true);
           }
       }
   }