Java学习笔记50：JSONObject与JSONArray的使用

分类： java 2013-07-02 10:41 4886人阅读 评论(0)收藏 举报

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：

[java] view plaincopyprint?

1. package com.xxx.video.resource.controller.web;  
2.   
3. import java.util.ArrayList;  
4. import java.util.HashMap;  
5.   
6. import net.sf.json.JSONArray;  
7. import net.sf.json.JSONObject;  
8.   
9.   
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. }  

package com.xxx.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：

[html] view plaincopyprint?

1. jsonObject1：{"UserName":"ZHULI","age":"30","workIn":"ALI"}  
2. jsonObject2：{"workIn":"ALI","age":"30","UserName":"ZHULI"}  
3. jsonArray1：["ZHULI","30","ALI"]  
4. jsonArray2：["ZHULI","30","ALI"]  
5. jsonArray FROM HASHMAP：[{"workIn":"ALI","age":"30","UserName":"ZHULI"}]  
6. jsonObject2：{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}  

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：

[html] view plaincopyprint?

1. package com.xxx.video.resource.controller.web;  
2.   
3. import net.sf.json.JSONArray;  
4. import net.sf.json.JSONObject;  
5.   
6.   
7. public class Test {  
8.   
9.     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. }  

package com.xxx.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：

[html] view plaincopyprint?

1. UserName:ZHULI  
2. Array:ZHULI Array:30 Array:ALI   

UserName:ZHULIArray:ZHULI Array:30 Array:ALI 

对象遍历

[java] view plaincopyprint?

1. if (!obj.isNull("sku")) {  
2.     HashMap<String, String> skuMap = new HashMap<String, String>();  
3.     JSONObject skuObject = obj.getJSONObject("sku");  
4.     Iterator<String> keys = skuObject.keys();  
5.     String key;  
6.     Object o;  
7.     while (keys.hasNext()) {  
8.         key = keys.next();  
9.         o = skuObject.get(key);  
10.         skuMap.put(key, String.valueOf(o));  
11.     }  
12. }