SpringBoot2.3.2版本在redis处理保存json格式的数据的时候，遇到到的坑-优快云博客

本文链接：https://blog.youkuaiyun.com/Tom_kobe/article/details/109298030

本文介绍如何在Spring Boot应用中配置Redis缓存以使用JSON格式存储数据，包括自定义序列化方式、设置默认缓存过期时间和禁用空值缓存等功能。

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1.如果我们在容器中使用自己编写的CacheManager，代码如下（注意加粗部分的代码）：

@Bean
public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {

    RedisSerializer<String> strSerialize = new StringRedisSerializer();
    Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = 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);
    om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    jackson2JsonRedisSerializer.setObjectMapper(om);

    RedisSerializationContext.SerializationPair<Object> serializationPair = RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer) ;
    RedisSerializationContext.SerializationPair<String> strSerializePair = RedisSerializationContext.SerializationPair.fromSerializer(strSerialize) ;
    RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
   ** redisCacheConfiguration.serializeValuesWith(serializationPair);
    redisCacheConfiguration.serializeKeysWith(strSerializePair);
    redisCacheConfiguration.entryTtl(Duration.ofSeconds(100));// 设置默认超时时间为
    redisCacheConfiguration.disableCachingNullValues();**

    RedisCacheManager.RedisCacheManagerBuilder builder = RedisCacheManager.builder(redisConnectionFactory)
            .cacheDefaults(redisCacheConfiguration);

    return builder.build();
}
    采用这种方式保存数据到缓存中的话，数据为jdk序列化之后的数据，并非json格式的数据。
    2.如果我们要想保存json格式的数据的话，则我们必须采用链式书写的方式，来进行数据的保存。
     @Bean
public RedisCacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {

    RedisSerializer<String> strSerialize = new StringRedisSerializer();
    Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = 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);
    om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    jackson2JsonRedisSerializer.setObjectMapper(om);

    RedisSerializationContext.SerializationPair<Object> serializationPair = RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer) ;
    RedisSerializationContext.SerializationPair<String> strSerializePair = RedisSerializationContext.SerializationPair.fromSerializer(strSerialize) ;
 **   RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
        .serializeValuesWith(serializationPair)
        .serializeKeysWith(strSerializePair)
        .entryTtl(Duration.ofSeconds(100))// 设置默认超时时间为
        .disableCachingNullValues();**

    RedisCacheManager.RedisCacheManagerBuilder builder = RedisCacheManager.builder(redisConnectionFactory)
            .cacheDefaults(redisCacheConfiguration);
    return builder.build();
}