/** 
      * 发起http请求并获取结果 
      *  
      * @param requestUrl 请求地址 
      * @param requestMethod 请求方式（GET、POST） 
      * @param outputStr 提交的数据 
      * @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值) 
      */  
     public static JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) {  
         JSONObject jsonObject = null;  
         StringBuffer buffer = new StringBuffer();
         InputStream  inputStream=null;
         try {
             URL url = new URL(requestUrl);
             HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();  
             httpUrlConn.setDoOutput(true);  
             httpUrlConn.setDoInput(true);  
             httpUrlConn.setUseCaches(false);
             // 设置请求方式（GET/POST）  
             httpUrlConn.setRequestMethod(requestMethod);  
             if ("GET".equalsIgnoreCase(requestMethod))  
                 httpUrlConn.connect();  
   
             // 当有数据需要提交时  
             if (null != outputStr) {  
                 OutputStream outputStream = httpUrlConn.getOutputStream();  
                 // 注意编码格式，防止中文乱码  
                 outputStream.write(outputStr.getBytes("UTF-8"));  
                 outputStream.close();  
             }
             //将返回的输入流转换成字符串  
             inputStream = httpUrlConn.getInputStream();  
             InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");  
             BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  
   
             String str = null;  
             while ((str = bufferedReader.readLine()) != null) {  
                 buffer.append(str);  
             }  
             bufferedReader.close();  
             inputStreamReader.close();  
             // 释放资源  
             inputStream.close();  
             inputStream = null;  
             httpUrlConn.disconnect();  
           jsonObject = JSONObject.fromObject(buffer.toString());
         } catch (ConnectException ce) {  
               ce.printStackTrace();
               System.out.println("Weixin server connection timed out");
         } catch (Exception e) {  
             e.printStackTrace();
             System.out.println("http request error:{}");
         }finally{
      try {
      if(inputStream!=null){
      inputStream.close();
      }
 } catch (IOException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
         } 
         return jsonObject;  
     }