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JSON使用方法举例

2024-07-13 23:52:35   211人阅读

例子1：

 1 import net.sf.json.JSONArray; 2 import net.sf.json.JSONObject; 3  4 /** 5  * Created by leiqiang on 2014/7/25. 6  */ 7 public class JSONObjectSample { 8     // 创建JSONObject对象 9     private static JSONObject createJSONObject() {10         JSONObject jsonObject = new JSONObject();11         jsonObject.put("username", "leiqiang");12         jsonObject.put("sex", "男");13         jsonObject.put("nickname", "lqPROplus");14         return jsonObject;15     }16 17     public static void main(String[] args) {18         JSONObject jsonObject = JSONObjectSample.createJSONObject();//静待方法，直接通过类名+方法调用19         // 输出jsonobject对象20         System.out.println("jsonObject：" + jsonObject);21 22         // 判读输出对象的类型23         boolean isArray = jsonObject.isArray();24         boolean isEmpty = jsonObject.isEmpty();25         boolean isNullObject = jsonObject.isNullObject();26         System.out.println("是否为数组:" + isArray + "， 是否为空:" + isEmpty27                 + "， isNullObject:" + isNullObject);28 29         // 添加属性，在jsonObject后面追加元素。30         jsonObject.element("address", "北京市");31         System.out.println("添加属性后的对象：" + jsonObject);32 33         // 返回一个JSONArray对象34         JSONArray jsonArray = new JSONArray();35         jsonArray.add(0, "this is a jsonArray value");36         jsonArray.add(1, "another jsonArray value");37         jsonObject.element("jsonArray", jsonArray);38         //在jsonObject后面加一个jsonArray39         JSONArray array = jsonObject.getJSONArray("jsonArray");40         //System.out.println("加入jsonArray后的对象："+jsonObject);41 42 43         System.out.println("返回一个JSONArray对象：" + array);44         // 添加JSONArray后的值45         System.out.println("结果=" + jsonObject);46 47         // 根据key返回一个字符串48         String username = jsonObject.getString("username");49         System.out.println("username=" + username);50 51         // 把字符转换为 JSONObject52         String temp = jsonObject.toString();53         JSONObject object = JSONObject.fromObject(temp);54 55         // 转换后根据Key返回值56         System.out.println("nickname=" + object.get("nickname"));57 58     }59 }

运行结果：

1 jsonObject：{"username":"leiqiang","sex":"男","nickname":"lqPROplus"}2 是否为数组:false， 是否为空:false， isNullObject:false3 添加属性后的对象：{"username":"leiqiang","sex":"男","nickname":"lqPROplus","address":"北京市"}4 返回一个JSONArray对象：["this is a jsonArray value","another jsonArray value"]5 结果={"username":"leiqiang","sex":"男","nickname":"lqPROplus","address":"北京市","jsonArray":["this is a jsonArray value","another jsonArray value"]}6 username==>leiqiang7 nickname=lqPROplus

例子2：

 1 import net.sf.json.JSONArray; 2 import net.sf.json.JSONObject; 3  4 /** 5  * Created by leiqiang on 2014/7/25. 6  */ 7 public class JSONTest { 8     public static void main(String args[]) { 9         JSONObject jsonObj0 = new JSONObject();10         JSONObject jsonObj1 = new JSONObject();11         JSONObject jsonObj2 = new JSONObject();12         JSONObject jsonObj3 = new JSONObject();13         JSONArray jsonArray = new JSONArray();14 15         //创建jsonObj016         jsonObj0.put("name0", "zhangsan");17         jsonObj0.put("sex1", "female");18         System.out.println("jsonObj0:" + jsonObj0);19 20         //创建jsonObj121         jsonObj1.put("name", "lisi");22         jsonObj1.put("sex", "male");23         System.out.println("jsonObj:" + jsonObj1);24 25         //创建jsonObj2，包含两个条目，条目内容分别为jsonObj0，jsonObj126         jsonObj2.put("item0", jsonObj0);27         jsonObj2.put("item1", jsonObj1);28         System.out.println("jsonObj2:" + jsonObj2);29 30         //创建jsonObj3，只有一个条目，内容为jsonObj231         jsonObj3.element("j3", jsonObj2);32         System.out.println("jsonObj3:" + jsonObj3);33 34         //往JSONArray中添加JSONObject对象。发现JSONArray跟JSONObject的区别就是JSONArray比JSONObject多中括号[]35         jsonArray.add(jsonObj1);36         System.out.println("jsonArray:" + jsonArray);37 38         JSONObject jsonObj4 = new JSONObject();39         jsonObj4.element("weather", jsonArray);40         System.out.println("jsonObj4:" + jsonObj4);41     }42 }

运行结果：

1 jsonObj0:{"name0":"zhangsan","sex1":"female"}2 jsonObj:{"name":"lisi","sex":"male"}3 jsonObj2:{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"lisi","sex":"male"}}4 jsonObj3:{"j3":{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"lisi","sex":"male"}}}5 jsonArray:[{"name":"lisi","sex":"male"}]6 jsonObj4:{"weather":[{"name":"lisi","sex":"male"}]}

例子3：

 1 import net.sf.json.JSONObject; 2  3 /** 4  * Created by leiqiang on 2014/7/25. 5  */ 6 public class JSONfromObject { 7     public static void main(String[] args) { 8  9         JSONObject object = JSONObject.fromObject("{\"username\":\"leiqiang\",\"sex\":\"男\",\"nickname\":\"lqPROplus\"}");10         System.out.println("nickname=" + object.get("nickname"));11 12         System.out.println(object.getString("username"));13 14         JSONObject object1 = new JSONObject();15         object1.put("a",object);16         System.out.println(object1);17     }18 19 }

运行结果：

1 nickname=lqPROplus2 leiqiang3 {"a":{"username":"leiqiang","sex":"男","nickname":"lqPROplus"}}


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