json和对象、list互转

import com.alibaba.fastjson.JSONObject;

Object obj = new Object();
// ...
String objJson = JSONObject.toJSONString(obj);

List<Object> list = new ArrayList<>();
// .....
String listJson = JSONObject.toJSONString(list);
// ...

import com.alibaba.fastjson.JSONObject;

Object obj = JSONObject.parseObject(headJson, Object .class);


List<Object> offList = JSONObject.parseArray(offListJson, Object.class);