要使程序可以运行必须引入JSON-lib包,JSON-lib包同时依赖于以下的JAR包:
commons-lang.jarcommons-beanutils.jarcommons-collections.jarcommons-logging.jarezmorph.jarjson-lib-2.2.2-jdk15.jarJSON-lib包是一个beans,collections,maps,java arrays 和XML和JSON互相转换的包。在本例中,我们将使用JSONObject类创建JSONObject对象,然后我们打印这些对象的值。为了使用JSONObject对象,我们要引入"net.sf.json"包。为了给对象添加元素,我们要使用put()方法。
package jsontest;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class JSONObjectSample {// 创建JSONObject对象 private static JSONObject createJSONObject() { 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");return jsonObject; }public static void main(String[] args) { JSONObject jsonObject = JSONObjectSample.createJSONObject();//静待方法,直接通过类名+方法调用// 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);// 添加属性,在jsonObject后面追加元素。 jsonObject.element("address", "福建省厦门市"); System.out.println("添加属性后的对象:" + 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);// 添加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);// 根据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);// 转换后根据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添加属性后的对象:{"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==>huangwuyiqq=413425430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"}]}相关资源:JSONObject与JSONArray使用中所需要的完全jar包整理