转自：https://www.cnblogs.com/xgjblog/p/3908033.html

Java不像PHP解析和生产JSON总是一个比较痛苦的过程。但是使用JSONObject和JSONArray会让整个过程相对舒服一些。

需要依赖的包：commons-lang.jar commons-beanutils.jar commons-collections.jar commons-logging.jar  ezmorph.jar json-lib-2.2.2-jdk15.jar

1. 创建一个JSONObject对象：

 

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
    
      hashMap = new HashMap
     
      ();        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
      
        arrayList = new ArrayList
       
        ();        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"]}

 

解析JSON字符串：

 

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:ZHULIArray:ZHULI Array:30 Array:ALI