通过RedisCacheManager自定义缓存序列化（适用通过注解缓存数据）

1.Redis 注解默认序列化机制

1.Spring Boot整合Redis组件提供的缓存自动配置类RedisCacheConfiguration（org.springframework.boot.autoconfigure.cache）,

其内部是通过Redis连接工厂RedisConnectionFactory定义了一个缓存管理器RedisCacheManager；

同时定义RedisCacheManager时，也默认使用了JdkSerializationRedisSerializer序列化方式。

@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(RedisConnectionFactory.class)
@AutoConfigureAfter(RedisAutoConfiguration.class)
@ConditionalOnBean(RedisConnectionFactory.class)
@ConditionalOnMissingBean(CacheManager.class)
@Conditional(CacheCondition.class)
class RedisCacheConfiguration {@BeanRedisCacheManager cacheManager(CacheProperties cacheProperties, CacheManagerCustomizers cacheManagerCustomizers,ObjectProvider<org.springframework.data.redis.cache.RedisCacheConfiguration> redisCacheConfiguration,ObjectProvider<RedisCacheManagerBuilderCustomizer> redisCacheManagerBuilderCustomizers,RedisConnectionFactory redisConnectionFactory, ResourceLoader resourceLoader) {RedisCacheManagerBuilder builder = RedisCacheManager.builder(redisConnectionFactory).cacheDefaults(determineConfiguration(cacheProperties, redisCacheConfiguration, resourceLoader.getClassLoader()));List<String> cacheNames = cacheProperties.getCacheNames();if (!cacheNames.isEmpty()) {builder.initialCacheNames(new LinkedHashSet<>(cacheNames));}if (cacheProperties.getRedis().isEnableStatistics()) {builder.enableStatistics();}redisCacheManagerBuilderCustomizers.orderedStream().forEach((customizer) -> customizer.customize(builder));return cacheManagerCustomizers.customize(builder.build());}private org.springframework.data.redis.cache.RedisCacheConfiguration determineConfiguration(CacheProperties cacheProperties,ObjectProvider<org.springframework.data.redis.cache.RedisCacheConfiguration> redisCacheConfiguration,ClassLoader classLoader) {return redisCacheConfiguration.getIfAvailable(() -> createConfiguration(cacheProperties, classLoader));}private org.springframework.data.redis.cache.RedisCacheConfiguration createConfiguration(CacheProperties cacheProperties, ClassLoader classLoader) {Redis redisProperties = cacheProperties.getRedis();org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration.defaultCacheConfig();config = config.serializeValuesWith(SerializationPair.fromSerializer(new JdkSerializationRedisSerializer(classLoader)));if (redisProperties.getTimeToLive() != null) {config = config.entryTtl(redisProperties.getTimeToLive());}if (redisProperties.getKeyPrefix() != null) {config = config.prefixCacheNameWith(redisProperties.getKeyPrefix());}if (!redisProperties.isCacheNullValues()) {config = config.disableCachingNullValues();}if (!redisProperties.isUseKeyPrefix()) {config = config.disableKeyPrefix();}return config;}}

2.如果想要使用自定义序列化方式的RedisCacheManager进行数据缓存操作，可以创建一个名为cacheManager的Bean组件，并在该组件中设置对应的序列化方式即可

2.自定义RedisCacheManager

@Bean
public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {// 分别创建String和JSON格式序列化对象，对缓存数据key和value进行转换RedisSerializer<String>strSerializer = new StringRedisSerializer();Jackson2JsonRedisSerializer jacksonSeial = new Jackson2JsonRedisSerializer(Object.class);// 解决查询缓存转换异常的问题ObjectMapper om = new ObjectMapper();om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);//过时om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);//用下面的方法代替上面的方法
om.activateDefaultTyping(LaissezFaireSubTypeValidator.instance,ObjectMapper.DefaultTyping.NON_FINAL);jacksonSeial.setObjectMapper(om);// 定制缓存数据序列化方式及时效RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig().entryTtl(Duration.ofDays(1)).serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(strSerializer)).serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jacksonSeial)).disableCachingNullValues();RedisCacheManager cacheManager = RedisCacheManager.builder(redisConnectionFactory).cacheDefaults(config).build();return cacheManager;
}