java中转换json方式（JSONArray，JSONObject），json解析

 package com.yunos.tv.video.resource.controller.web;

 import java.util.ArrayList;
 import java.util.HashMap;

 import net.sf.json.JSONArray;
 import net.sf.json.JSONObject;

 public class Test {

     public static void main(String[] args) {
         //JsonObject和JsonArray区别就是JsonObject是对象形式，JsonArray是数组形式
         //创建JsonObject第一种方法
         JSONObject jsonObject = new JSONObject();
         jsonObject.put("UserName", "ZHULI");
         jsonObject.put("age", "30");
         jsonObject.put("workIn", "ALI");
         System.out.println("jsonObject1：" + jsonObject);

         //创建JsonObject第二种方法
         HashMap<String, String> hashMap = new HashMap<String, String>();
         hashMap.put("UserName", "ZHULI");
         hashMap.put("age", "30");
         hashMap.put("workIn", "ALI");
         System.out.println("jsonObject2：" + JSONObject.fromObject(hashMap));

         //创建一个JsonArray方法1
         JSONArray jsonArray = new JSONArray();
         jsonArray.add(0, "ZHULI");
         jsonArray.add(1, "30");
         jsonArray.add(2, "ALI");
         System.out.println("jsonArray1：" + jsonArray);

         //创建JsonArray方法2
         ArrayList<String> arrayList = new ArrayList<String>();
         arrayList.add("ZHULI");
         arrayList.add("30");
         arrayList.add("ALI");
         System.out.println("jsonArray2：" + JSONArray.fromObject(arrayList));

         //如果JSONArray解析一个HashMap，则会将整个对象的放进一个数组的值中
         System.out.println("jsonArray FROM HASHMAP：" + JSONArray.fromObject(hashMap));

         //组装一个复杂的JSONArray
         JSONObject jsonObject2 = new JSONObject();
         jsonObject2.put("UserName", "ZHULI");
         jsonObject2.put("age", "30");
         jsonObject2.put("workIn", "ALI");
         jsonObject2.element("Array", arrayList);
         System.out.println("jsonObject2：" + jsonObject2);

     }
 }

 结果：

 jsonObject1：{"UserName":"ZHULI","age":"30","workIn":"ALI"}
 jsonObject2：{"workIn":"ALI","age":"30","UserName":"ZHULI"}
 jsonArray1：["ZHULI","30","ALI"]
 jsonArray2：["ZHULI","30","ALI"]
 jsonArray FROM HASHMAP：[{"workIn":"ALI","age":"30","UserName":"ZHULI"}]
 jsonObject2：{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}

json解析

package com.yunos.tv.video.resource.controller.web;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class Test {

    public static void main(String[] args) {
        String jsonString = "{\"UserName\":\"ZHULI\",\"age\":\"30\",\"workIn\":\"ALI\",\"Array\":[\"ZHULI\",\"30\",\"ALI\"]}";
        //将Json字符串转为java对象
        JSONObject obj = JSONObject.fromObject(jsonString);
        //获取Object中的UserName
        if (obj.has("UserName")) {
            System.out.println("UserName:" + obj.getString("UserName"));
        }
        //获取ArrayObject
        if (obj.has("Array")) {
            JSONArray transitListArray = obj.getJSONArray("Array");
            for (int i = 0; i < transitListArray.size(); i++) {
                System.out.print("Array:" + transitListArray.getString(i) + " ");
            }
        }
    }
}

返回：
UserName:ZHULI
Array:ZHULI Array:30 Array:ALI