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