一、报错
java.lang.String cannot be cast to com.alibaba.fastjson.JSONArray
二、解决
https://blog.csdn.net/angelofmersy/article/details/52355017
https://blog.csdn.net/Hello_World_QWP/article/details/90692167
三。总结
JSONObject常用方法
https://www.cnblogs.com/zjdxr-up/p/9736755.html