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

た入场券 2022-02-05 09:51 379阅读 0赞

### demo ###

import com.fasterxml.jackson.annotation.JsonAutoDetect;
    import com.fasterxml.jackson.annotation.PropertyAccessor;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import com.github.benmanes.caffeine.cache.Caffeine;
    import org.springframework.cache.CacheManager;
    import org.springframework.cache.annotation.CachingConfigurerSupport;
    import org.springframework.cache.annotation.EnableCaching;
    import org.springframework.cache.caffeine.CaffeineCacheManager;
    import org.springframework.cache.interceptor.KeyGenerator;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Primary;
    import org.springframework.data.redis.cache.RedisCacheConfiguration;
    import org.springframework.data.redis.cache.RedisCacheManager;
    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
    import org.springframework.data.redis.serializer.RedisSerializationContext;
    import org.springframework.data.redis.serializer.RedisSerializer;
    
    import java.time.Duration;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Objects;
    
    /** * Spring Cache 自动配置类 */
    @Configuration
    @EnableCaching
    public class SpringCacheAutoConfiguration extends CachingConfigurerSupport { 
    
        /** * 在没有指定缓存 key 的情况下，key 的默认生成策略 */
        @Override
        @Bean
        @Primary
        public KeyGenerator keyGenerator() { 
            return (target, method, params) -> { 
                StringBuilder builder = new StringBuilder();
                builder.append(target.getClass().getName());
                builder.append("#").append(method.getName());
                if (params.length == 0) { 
                    builder.append("()");
                } else { 
                    builder.append("(");
                    for (Object obj : params) { 
                        builder.append(obj).append(",");
                    }
                    builder.deleteCharAt(builder.length() - 1).append(")");
                }
                return builder.toString();
            };
        }
    
        /** * spring cache 注解，redis 缓存管理器配置，默认使用 */
        @Bean
        @Primary
        public CacheManager redisCacheManager(RedisTemplate<Object, Object> redisTemplate) { 
            RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                    .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer((RedisSerializer<String>) redisTemplate.getKeySerializer()))  // key 序列化方式
                    .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(redisTemplate.getValueSerializer()))                        // value 序列化方式
                    .disableCachingNullValues()         // 不缓存 null 值
                    .entryTtl(Duration.ofHours(3L));    // 默认缓存过期时间
    
            return RedisCacheManager.builder(Objects.requireNonNull(redisTemplate.getConnectionFactory()))
                    .cacheDefaults(redisCacheConfiguration)
                    .transactionAware()
                    .withInitialCacheConfigurations(this.getRedisCacheConfigurationMap())// 指定 key 策略
                    .build();
        }
    
        /** * 指定 key 策略 * @return */
        private Map<String, RedisCacheConfiguration> getRedisCacheConfigurationMap() { 
            Map<String, RedisCacheConfiguration> redisCacheConfigurationMap = new HashMap<>();
            redisCacheConfigurationMap.put("test-key", this.getRedisCacheConfigurationWithTtl(6));
    
            return redisCacheConfigurationMap;
        }
    
        private RedisCacheConfiguration getRedisCacheConfigurationWithTtl(Integer hours) { 
            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.ofHours(hours));
    
            return redisCacheConfiguration;
        }
    
    
        /** * spring cache 注解，caffeine 缓存管理器配置 */
        @Bean
        public CacheManager caffeineCacheManager() { 
            Caffeine<Object, Object> caffeine = Caffeine.newBuilder()
                    .initialCapacity(50)
                    .maximumSize(1000)
                    .expireAfterWrite(Duration.ofHours(3L));
    
            CaffeineCacheManager caffeineCacheManager = new CaffeineCacheManager();
            caffeineCacheManager.setCaffeine(caffeine);
            caffeineCacheManager.setAllowNullValues(false);
    
            return caffeineCacheManager;
        }
    }