java中常见的JSON格式转换方法:

import net.sf.json.JSONArray; //用于集合或数组

import net.sf.json.JSONObject; //用于对象

JSONObject object = new JSONObject();

1.把java 对象列表转换为json对象数组，并转为字符串

JSONArray array = JSONArray.fromObject(userlist); String jsonstr = array.toString();

2.把java对象转换成json对象，并转化为字符串(好像是map)

JSONObject object = JSONObject.fromObject(invite); String str=object.toString();

3.把JSON字符串转换为JAVA 对象数组 String personstr = getRequest().getParameter("persons"); JSONArray json = JSONArray.fromObject(personstr); List persons = (List )JSONArray.toCollection(json, nvoidPerson.class);

4.把JSON字符串转换为JAVA 对象

JSONObject jsonobject = JSONObject.fromObject(str); PassportLendsEntity passportlends = null; try { //获取一个json数组 JSONArray array = jsonobject.getJSONArray("passports"); //将json数组 转换成 List 泛型 List list = new ArrayList (); for (int i = 0; i < array.size(); i++) {
JSONObject object = (JSONObject)array.get(i);
PassPortForLendsEntity passport = (PassPortForLendsEntity)JSONObject.toBean(object, PassPortForLendsEntity.class);

if(passport != null){ list.add(passport); } }