@Cacheable 设置缓存过期时间

- 日理万妓 2023-10-10 12:38 57阅读 0赞

**RedisCacheConfig 文件**

@Configuration
    public class RedisCacheConfig {
        
    
    	/**
    	* 自定义的缓存key的生成策略 若想使用这个key
    	* 只需要讲注解上keyGenerator的值设置为simpleKeyGenerator即可
    	**/
        @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

**补充:**

> 根据个人情况选择使用哪种单位设置过期时间

.entryTtl(Duration.ofSeconds(seconds))设置时使用单位为秒
    .entryTtl(Duration.ofMinutes(minutes));设置时使用单位为分钟
    .entryTtl(Duration.ofHours(hours));设置时使用单位为小时