SpringBoot 2.X @Cacheable,redis-cache 如何根据key设置缓存时间?

SpringBoot 2.x 以后,@Cacheable, Redis-cahce 的配置变动比较大

网上找了点资料,目前我的配置是

@Bean
    public RedisCacheConfiguration redisCacheConfiguration() {
        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);

        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
        redisCacheConfiguration = redisCacheConfiguration.serializeValuesWith(
            RedisSerializationContext
                .SerializationPair
                .fromSerializer(jackson2JsonRedisSerializer)
        ).entryTtl(Duration.ofMinutes(30));

        return redisCacheConfiguration;
    }

使用上述代码后,可以成功缓存,但不能对key指定缓存时间,

clipboard.png

如图,两个 key UserInfoList 和 key UserInfoListAnother 都是默认的30分钟

2.X以后无法再使用 RedisCacheManager rcm = new RedisCacheManager(redisTemplate) 构造方法来设置缓存时间,请问该如何配置?

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    4 个回答

    google 了一晚上,终于找到了比较满意的方法,下面是整个的 RedisCacheConfig 文件

    @Configuration
    public class RedisCacheConfig {
    
        @Bean
        public KeyGenerator simpleKeyGenerator() {
            return (o, method, objects) -> {
                StringBuilder stringBuilder = new StringBuilder();
                stringBuilder.append(o.getClass().getSimpleName());
                stringBuilder.append(".");
                stringBuilder.append(method.getName());
                stringBuilder.append("[");
                for (Object obj : objects) {
                    stringBuilder.append(obj.toString());
                }
                stringBuilder.append("]");
    
                return stringBuilder.toString();
            };
        }
    
        @Bean
        public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
            return new RedisCacheManager(
                RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory),
                this.getRedisCacheConfigurationWithTtl(600), // 默认策略,未配置的 key 会使用这个
                this.getRedisCacheConfigurationMap() // 指定 key 策略
            );
        }
    
        private Map<String, RedisCacheConfiguration> getRedisCacheConfigurationMap() {
            Map<String, RedisCacheConfiguration> redisCacheConfigurationMap = new HashMap<>();
            redisCacheConfigurationMap.put("UserInfoList", this.getRedisCacheConfigurationWithTtl(3000));
            redisCacheConfigurationMap.put("UserInfoListAnother", this.getRedisCacheConfigurationWithTtl(18000));
    
            return redisCacheConfigurationMap;
        }
    
        private RedisCacheConfiguration getRedisCacheConfigurationWithTtl(Integer seconds) {
            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);
    
            RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
            redisCacheConfiguration = redisCacheConfiguration.serializeValuesWith(
                RedisSerializationContext
                    .SerializationPair
                    .fromSerializer(jackson2JsonRedisSerializer)
            ).entryTtl(Duration.ofSeconds(seconds));
    
            return redisCacheConfiguration;
        }
    }

    要指定 key 的过期时间,只要在getRedisCacheConfigurationMap方法中添加就可以。
    然后只需要 @Cacheable 就可以把数据存入 redis

        @Cacheable(value = "UserInfoList", keyGenerator = "simpleKeyGenerator") // 3000秒
        @Cacheable(value = "UserInfoListAnother", keyGenerator = "simpleKeyGenerator") // 18000秒
        @Cacheable(value = "DefaultKeyTest", keyGenerator = "simpleKeyGenerator") // 600秒,未指定的key,使用默认策略
        

      使用Spring Boot了当然是使用Redis的自动装配了,只需要引入redis-starter即可开箱用
      `

      redisTemplate.opsForValue().set(key, value, expires, timeUnit)
         

      `

      补充一下你的Bean

      @Bean
      public RedisCacheConfiguration redisCacheConfiguration(RedisTemplate<String, Object> template, CacheStrategy stategy) {
      
          redisCacheManager.setExpires(strategy.getExpiresMap);
          return redisCacheConfiguration;
      }
      

      然后配置CacheStrategy类

      public static final String KEY = "_TEST";
      
      public static Long CACHE_TIME = 10000L;
      private Map<String, Long> expiresMap = null;
      
      @PostConstruct
      public void init(){
          expiresMap = Maps.newHashMap();
          expiresMap.put(KEY, CACHE_TIME);
      }
      
      public Map<String, Long> getExpiresMap(){
          return this.expiresMap;
      }
      
      

      然后使用Cacheable注解的时候可以使用指定key,也可以使用Spring的自动生成策略key具体方法

      @Cacheable(value = "", key =)// 自定义key策略
      @Cacheable(value = "")//自动生成key策略
      
      
      

      还有一种方式是使用SpEL表达式方式

      @Cacheable(value = "example#${select.cache.timeout:1000}", key = "")//example 是cache容器名字 #后边的是SpEL表达式
      
      
      

      不知道是否可以直接解决你的问题,如果愿意你可以作一个参考

        • 1
        • 新人请关照

        请问,为什么key是用两个冒号(::)隔开得,为什么不是一个?可以更换成一个么?

          RedisCacheConfiguration redisCacheConfiguration = config
                                  .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                          .computePrefixWith(name -> name + ":")
                          .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer));
          
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