URL url = null;
                try {
                    System.out.println(urlString);
                    url = new URL(urlString);
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                }

                HttpURLConnection httpURLConnection = null;
                try {
                    httpURLConnection = (HttpURLConnection) url.openConnection();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                try {
                    InputStream inputStream = httpURLConnection.getInputStream();
					// 避免請求時因網路質量導致得到的空資料
                    /** while(inputStream.available() == 0){
                        inputStream = httpURLConnection.getInputStream();
                    } */
                    /** 更新：網路阻塞時inputstream可能獲取不全，採用與httpURLConnection.getContentLength()對比的方式，得到完整inputstream */
                    int length = inputStream.available();
                    while(length != httpURLConnection.getContentLength()){
                       inputStream = httpURLConnection.getInputStream();
                       length = inputStream.available();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }