本文目录
会把被标注的方法的返回值缓存到 Redis 中,相同的操作不会查数据库而是从缓存中获取数据。
Springboot 集成 Redis,使用 @Cacheable 注解之后,把数据缓存到 Redis 中,数据是保存在Redis 中了,但是,通过 Redis 的可视化管理工具查看缓存的数据时,却发现 redis 中的 key 正常,但是 value 是乱码。如下图所示的乱码:

修改过后,可以正常显示,如下图:

其实出现上述乱码,一般情况都是没有配置 redis 序列化值导致的,而源码里的配置又没有默认,需要自己去实现。
在网上有很多种写法,我搜索了很多都不适合自己,只有下面这一种可以正常。
添加一个 Redis 的配置类即可。如下代码是我在项目中的代码,加上重启项目 Redis 缓存中的 value 即可正常显示。
- package com.iot.back.message.process.config;
-
- import org.springframework.boot.autoconfigure.cache.CacheProperties;
- import org.springframework.cache.annotation.CachingConfigurerSupport;
- import org.springframework.cache.annotation.EnableCaching;
- import org.springframework.context.annotation.Bean;
- import org.springframework.context.annotation.Configuration;
- import org.springframework.data.redis.cache.RedisCacheConfiguration;
- import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
- import org.springframework.data.redis.serializer.RedisSerializationContext;
-
- /**
- *
RedisConfig 此类用于:Redis相关配置,用于解决存入Redis中值乱码问题
- *
@author:hujm
- *
@date:2022年08月18日 18:04
- *
@remark:
- */
- @EnableCaching
- @Configuration
- public class RedisConfig extends CachingConfigurerSupport {
-
- @Bean
- public RedisCacheConfiguration redisCacheConfiguration(CacheProperties cacheProperties) {
-
- CacheProperties.Redis redisProperties = cacheProperties.getRedis();
- RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig();
-
- // 序列化值
- config = config.serializeValuesWith(RedisSerializationContext.SerializationPair
- .fromSerializer(new GenericJackson2JsonRedisSerializer()));
-
- if (redisProperties.getTimeToLive() != null) {
- config = config.entryTtl(redisProperties.getTimeToLive());
- }
- if (redisProperties.getKeyPrefix() != null) {
- config = config.prefixKeysWith(redisProperties.getKeyPrefix());
- }
- if (!redisProperties.isCacheNullValues()) {
- config = config.disableCachingNullValues();
- }
- if (!redisProperties.isUseKeyPrefix()) {
- config = config.disableKeyPrefix();
- }
-
- return config;
- }
- }
使用 @Cacheable 注解的类
- package com.iot.back.message.process.rpc;
-
- import com.iot.back.message.process.convert.DeviceBasicInfoConvert;
- import com.iot.back.message.process.dto.DeviceBasicInfoDTO;
- import com.iot.basic.iotsmarthome.api.client.device.DeviceCloudClient;
- import com.iot.basic.iotsmarthome.api.response.device.DeviceBasicInfoResponse;
- import com.iot.framework.core.response.CommResponse;
- import lombok.extern.slf4j.Slf4j;
- import org.springframework.cache.annotation.Cacheable;
- import org.springframework.stereotype.Component;
-
- import javax.annotation.Resource;
-
- /**
- *
DeviceBasicInfoRpc 此类用于:设备基本信息远程调用
- *
@author:hujm
- *
@date:2022年05月23日 15:07
- *
@remark:
- */
- @Slf4j
- @Component
- public class DeviceBasicInfoRpc {
-
- @Resource
- private DeviceCloudClient deviceCloudClient;
-
- @Cacheable(cacheNames = "back-process-service:cache", key = "#sn+':'+#deviceId", sync = true)
- public DeviceBasicInfoDTO getDeviceBasicInfo(String sn, Integer deviceId) {
-
- CommResponse
deviceBasicInfoCommResponse = deviceCloudClient.getDeviceBasicInfo(sn, deviceId); -
- if (deviceBasicInfoCommResponse == null || deviceBasicInfoCommResponse.isFail()) {
- log.error("P0|DeviceBasicInfoRpc|getDeviceBasicInfo|调用设备云服务时,根据sn和deviceId获取设备基础信息失败!");
- return null;
- }
-
- DeviceBasicInfoResponse deviceBasicInfoResponse = deviceBasicInfoCommResponse.getData();
-
- return DeviceBasicInfoConvert.INSTANCE.convert2DeviceBasicInfoDTO(deviceBasicInfoResponse);
- }
- }
完结!