Json转化

import java.util.*;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Test {

public static void main(String[] args) {

//对象转json

Stu s = new Stu("123","1");

JSONObject jsonObject = JSONObject.fromObject(s);

System.out.println(jsonObject);//输出{"name":"123","age":"1"}

//当是数组或list的时候

Stu[] s2 = new Stu[5];

List<Stu> stuList = new ArrayList<Stu>();

for (int i = 0; i < s2.length; i++) {

s2[i] = new Stu();

s2[i].setAge(i+"age");

s2[i].setName(i+"name");

stuList.add(s2[i]);

}

JSONArray jsonArray = JSONArray.fromObject(s2);

System.out.println(jsonArray);

//当既有对象又有数组的时候

Map<String,Object> map = new HashMap<String,Object>();

Stu s3 = new Stu();

s3.setName("haha");

s3.setAge("23");

map.put("teacher", s3);

map.put("student", stuList);

JSONObject jsonObjectFromMap = JSONObject.fromObject(map);

System.out.println(jsonObjectFromMap);

//把json转化成对象

JSONObject obj=JSONObject.fromObject(s);

Stu emp=(Stu) JSONObject.toBean(obj,Stu.class);

System.out.println("12"+emp.getName());

//把json数组转化成对象

JSONArray a = JSONArray.fromObject(stuList);

Stu[] ss = (Stu[]) JSONArray.toArray(a,Stu.class);

for (Stu stu : ss) {

System.out.println(stu.getName());

}

}

}