Json传值

public static String SendUlr(String requestUrl,String xml) {
	   	 String responseStr="";
	       try {
	           URL url = new URL(requestUrl);
	           HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
	           urlConnection.setDoOutput(true);
	           urlConnection.setDoInput(true);
	           urlConnection.setRequestMethod("POST");
	           urlConnection.setUseCaches(false); 
	           urlConnection.setInstanceFollowRedirects(true);
	           urlConnection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
	           urlConnection.setRequestProperty("Charset", "UTF-8"); 
	           urlConnection.connect();
	           DataOutputStream out = new DataOutputStream(urlConnection.getOutputStream());
	           String params= xml;       
	           out.write(params.getBytes("UTF-8"));
	         /*  out.writeBytes(params);*/
	           out.flush();
	           out.close(); 
	           BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(),"UTF-8"));
	           String line;
	           while ((line = reader.readLine()) != null){
	               responseStr+=line;
	           }
	           reader.close();
	           urlConnection.disconnect();
	       }catch (MalformedURLException e) {
	           // TODO Auto-generated catch block
	           e.printStackTrace();
	       } catch (ProtocolException e) {
	           // TODO Auto-generated catch block
	           e.printStackTrace();
	       } catch (IOException e) {
	           // TODO Auto-generated catch block
	           e.printStackTrace();
	       }
	       return responseStr;
	   }

PS://{"stu":"11","stuName":"w","sex":"男"}
String url = "http://localhost:8080/yikang/q/yikang/YtxHaixun/test";
String par = "a="+"123";
String str = YikangUtil.SendUlr(url, par);
JSONObject jsonp = JSON.parseObject(str);
System.out.println(jsonp.get("id"));

	//PS:[{"stu":"11","stuName":"w","sex":"男"},
                {"stu":"11","stuName":"w","sex":"男"},
                {"stu":"11","stuName":"w","sex":"男"}]
	String url = "http://localhost:8080/yikang/q/yikang/YtxHaixun/test";
	String par = "a="+"123";
	String str = YikangUtil.SendUlr(url, par);
	JSONArray parseArray = JSONArray.parseArray(str);
	
	int size = parseArray.size();
	for(int i=0;i<size;i++){
	　　String id = (String)parseArray.getJSONObject(i).get("id");
	　　System.out.println("==="+id);
	}