1.首先在对应表添加一个json类型字段
2.在java对应的实体类添加对应的字段，重点是加上(typeHandler = JacksonTypeHandler.class)这个注解
不然的话保存会报如下错Cause: java.lang.IllegalStateException: Type handler was null on parameter mapping for property 'urlParams'. It was either not specified and/or could not be found for the javaType (com.alibaba.fastjson.JSONObject) : jdbcType (null) combination.
3.mybatisPlus查询json类型数据结果为null，这个得在@TableName加上autoResultMap = true注解
来源地址：https://blog.csdn.net/weixin_44729970/article/details/129141353
