JsonArray和JsonObject的使用
import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class JsonTest { public static void main(String[] args) { JSONObject jsonObject = new JSONObject(); jsonObject.put("username", "huangwuyi"); jsonObject.put("sex", "男"); jsonObject.put("QQ", "413425430"); jsonObject.put("Min.score", new Integer(99)); jsonObject.put("nickname", "梦中心境"); // 输出jsonobject对象 System.out.println("=====jsonObject:" + jsonObject); // 判读输出对象的类型 boolean isArray = jsonObject.isArray(); boolean isEmpty = jsonObject.isEmpty(); boolean isNullObject = jsonObject.isNullObject(); System.out.println("=====是否为数组:" + isArray + ", 是否为空:" + isEmpty + "。 isNullObject:" + isNullObject); // 加入属性,在jsonObject后面追加元素。 jsonObject.element("address", "福建省厦门市"); System.out.println("=====加入属性后的对象:" + jsonObject); // 返回一个JSONArray对象 JSONArray jsonArray = new JSONArray(); jsonArray.add(0, "this is a jsonArray value"); jsonArray.add(1, "another jsonArray value"); jsonObject.element("jsonArray", jsonArray); // 在jsonObject后面住家一个jsonArray JSONArray array = jsonObject.getJSONArray("jsonArray"); System.out.println(jsonObject); System.out.println("=====返回一个JSONArray对象:" + array); // 加入JSONArray后的值 // {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]} System.out.println("=====结果:" + jsonObject); // 依据key返回一个字符串 String username = jsonObject.getString("username"); System.out.println("=====username:" + username); // 把字符转换为 JSONObject String temp = jsonObject.toString(); JSONObject object = JSONObject.fromObject(temp); // 转换后依据Key返回值 System.out.println("=====qq:" + object.get("QQ")); } }
输出结果:
=====jsonObject:{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境"} =====是否为数组:false。 是否为空:false。 isNullObject:false =====加入属性后的对象:{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市"} {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]} =====返回一个JSONArray对象:["this is a jsonArray value","another jsonArray value"] =====结果:{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]} =====username:huangwuyi =====qq:413425430
另外一个样例:
import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class JsonObjectTest { /** * @param args */ public static void main(String[] args) { JSONObject jsonObj0 = new JSONObject(); JSONObject jsonObj = new JSONObject(); JSONObject jsonObj2 = new JSONObject(); JSONObject jsonObj3 = new JSONObject(); JSONArray jsonArray = new JSONArray(); // 创建jsonObj0 jsonObj0.put("name0", "zhangsan"); jsonObj0.put("sex1", "female"); System.out.println("jsonObj0:" + jsonObj0); // 创建jsonObj1 jsonObj.put("name", "xuwei"); jsonObj.put("sex", "male"); System.out.println("jsonObj:" + jsonObj); // 创建jsonObj2,包括两个条目,条目内容分别为jsonObj0。jsonObj1 jsonObj2.put("item0", jsonObj0); jsonObj2.put("item1", jsonObj); System.out.println("jsonObj2:" + jsonObj2); // 创建jsonObj3,仅仅有一个条目,内容为jsonObj2 jsonObj3.element("j3", jsonObj2); System.out.println("jsonObj3:" + jsonObj3); // 往JSONArray中加入JSONObject对象。发现JSONArray跟JSONObject的差别就是JSONArray比JSONObject多中括号[] jsonArray.add(jsonObj); System.out.println("jsonArray:" + jsonArray); JSONObject jsonObj4 = new JSONObject(); jsonObj4.element("weather", jsonArray); System.out.println("jsonObj4:" + jsonObj4); } }
输出结果:
jsonObj0:{"name0":"zhangsan","sex1":"female"} jsonObj:{"name":"xuwei","sex":"male"} jsonObj2:{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}} jsonObj3:{"j3":{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}}} jsonArray:[{"name":"xuwei","sex":"male"}] jsonObj4:{"weather":[{"name":"xuwei","sex":"male"}]}
总结:
JsonArray的对象中有方括号,有add和element两种set方法。有opt和get两种get方法。JsonObject是以key : value的形式存在的,有put和element两种set方法。有opt和get两种get方法。