自定义的 RedisTemplate 配置类相对于 Spring 提供的默认配置有以下几个优点：
自定义序列化方式：默认的 RedisTemplate 使用的是 JdkSerializationRedisSerializer，这种序列化方式生成的结果不易阅读，且占用空间大。在这个自定义配置中，使用了 Jackson2JsonRedisSerializer 和 StringRedisSerializer，这样存储在 Redis 中的数据更易于阅读和理解。
更好的集成：自定义的 RedisTemplate 可以更好地集成到项目中，比如在这个配置中，使用了 ObjectMapper 来配置 Jackson2JsonRedisSerializer，这样可以更好地控制 JSON 的序列化和反序列化。
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