1、String 转 bean

String addition = ...;

CoffeeFormula formula = JSON.parseObject(addition, new TypeReference<CoffeeFormula>() {});

2. String转JSONObject

JSONObject obj=JSON.parseObject(addition);

3.bean 转JSONObject

//为null的属性不转换

JSONObject  jo = (JSONObject) JSONObject.toJSON(user);

4.JSONObject  转bean

DeviceVersion dVersion = JSON.toJavaObject(contentJsonObject, DeviceVersion.class);

5.fastjson  List转JSONArray
List<T> list = new ArrayList<T>();
JSONArray array= JSONArray.parseArray(JSON.toJSONString(list))；

6.fastjson  JSONArray转List
JSONArray array = new JSONArray();
List<EventColAttr> list = JSONObject.parseArray(array.toJSONString(), EventColAttr.class);

7.fastjson  字符串转List
String str = "";
List<T> list = JSONObject.parseArray(str,T.class);