学习笔记：创建JSONObject对象：

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package ............

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", "张三");

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", ""张三");

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, ""张三");

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("张三");

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", "张三");

jsonObject2.put("age", "30");

jsonObject2.put("workIn", "ALI");

jsonObject2.element("Array", arrayList);
System.out.println("jsonObject2：" + jsonObject2);

}

结果：

jsonObject1：{"UserName":"张三","age":"30","workIn":"ALI"}

jsonObject2：{"workIn":"ALI","age":"30","UserName":"张三"}

jsonArray1：["张三","30","ALI"] jsonArray2：["张三","30","ALI"]
jsonArray FROM HASHMAP：[{"workIn":"ALI","age":"30","UserName":"张三"}]

jsonObject2：
{"UserName":"张三","age":"30","workIn":"ALI","Array":["张三","30","ALI"]}

解析JSON字符：

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Test {

public static void main(String[] args) {

String jsonString = "{\"UserName\":\"张三\",\"age\":\"30\",\"workIn\":\"ALI\",\"Array\":[\"张三\",\"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) + " ");

}

UserName：张三

array：张三 array：30 array: ALI

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