JSONObject与JSONArray的使用

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.xxx.video.resource.controller.web;  
02.  
03.import java.util.ArrayList;  
04.import java.util.HashMap;  
05.  
06.import net.sf.json.JSONArray;  
07.import net.sf.json.JSONObject;  
08.  
09.  
10.public class Test {  
11.  
12.    public static void main(String[] args) {  
13.        //JsonObject和JsonArray区别就是JsonObject是对象形式，JsonArray是数组形式  
14.        //创建JsonObject第一种方法  
15.        JSONObject jsonObject = new JSONObject();  
16.        jsonObject.put("UserName","ZHULI");  
17.        jsonObject.put("age","30");  
18.        jsonObject.put("workIn","ALI");  
19.        System.out.println("jsonObject1：" + jsonObject);  
20.          
21.        //创建JsonObject第二种方法  
22.        HashMap<String,String> hashMap = new HashMap<String,String>();  
23.        hashMap.put("UserName","ZHULI");  
24.        hashMap.put("age","30");  
25.        hashMap.put("workIn","ALI");  
26.        System.out.println("jsonObject2：" + JSONObject.fromObject(hashMap));  
27.          
28.        //创建一个JsonArray方法1  
29.        JSONArray jsonArray = new JSONArray();  
30.        jsonArray.add(0,"ZHULI");  
31.        jsonArray.add(1,"30");  
32.        jsonArray.add(2,"ALI");  
33.        System.out.println("jsonArray1：" + jsonArray);  
34.          
35.        //创建JsonArray方法2  
36.        ArrayList<String> arrayList = new ArrayList<String>();  
37.        arrayList.add("ZHULI");  
38.        arrayList.add("30");  
39.        arrayList.add("ALI");  
40.        System.out.println("jsonArray2：" + JSONArray.fromObject(arrayList));  
41.          
42.        //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  
43.        System.out.println("jsonArray FROM HASHMAP：" + JSONArray.fromObject(hashMap));  
44.          
45.        //组装一个复杂的JSONArray  
46.        JSONObject jsonObject2 = new JSONObject();  
47.        jsonObject2.put("UserName","ZHULI");  
48.        jsonObject2.put("age","30");  
49.        jsonObject2.put("workIn","ALI");  
50.        jsonObject2.element("Array",arrayList);  
51.        System.out.println("jsonObject2：" + jsonObject2);  
52.                  
53.    }  
54.}  

结果：

jsonObject1：{"UserName":"ZHULI","age":"30","workIn":"ALI"}  
02.jsonObject2：{"workIn":"ALI","UserName":"ZHULI"}  
03.jsonArray1：["ZHULI","30","ALI"]  
04.jsonArray2：["ZHULI","ALI"]  
05.jsonArray FROM HASHMAP：[{"workIn":"ALI","UserName":"ZHULI"}]  
06.jsonObject2：{"UserName":"ZHULI","workIn":"ALI","Array":["ZHULI","ALI"]}  

解析JSON字符串：

package com.xxx.video.resource.controller.web;  
02.  
03.import net.sf.json.JSONArray;  
04.import net.sf.json.JSONObject;  
05.  
06.  
07.public class Test {  
08.  
09.    public static void main(String[] args) {  
10.        String jsonString = "{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}";  
11.        //将Json字符串转为java对象  
12.        JSONObject obj = JSONObject.fromObject(jsonString);  
13.        //获取Object中的UserName  
14.        if (obj.has("UserName")) {  
15.            System.out.println("UserName:" + obj.getString("UserName"));  
16.        }  
17.        //获取ArrayObject  
18.        if (obj.has("Array")) {  
19.            JSONArray transitListArray = obj.getJSONArray("Array");  
20.            for (int i = 0; i < transitListArray.size(); i++) {  
21.                System.out.print("Array:" + transitListArray.getString(i) + " ");  
22.            }  
23.        }  
24.    }  
25.}  

返回

UserName:ZHULI  
02.Array:ZHULI Array:30 Array:ALI   

对象遍历

if (!obj.isNull("sku")) {  
02.    HashMap<String,String> skuMap = new HashMap<String,String>();  
03.    JSONObject skuObject = obj.getJSONObject("sku");  
04.    Iterator<String> keys = skuObject.keys();  
05.    String key;  
06.    Object o;  
07.    while (keys.hasNext()) {  
08.        key = keys.next();  
09.        o = skuObject.get(key);  
10.        skuMap.put(key,String.valueOf(o));  
11.    }  
12.}  

（编辑：李大同）

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