/**
	 * 向指定的 URL傳送遠端POST方法的請求
	 * @param url傳送請求的 URL
	 * @param json請求引數，
	 * @return 所代表遠端資源的響應結果
	 */
	public static JSONObject sendPost(String url, JSON json) {
		PrintWriter out = null;
		BufferedReader in = null;
		JSONObject jsonObject = null;
		String result = "";
		try {
			 URL realUrl = new URL(url);
			// 開啟和URL之間的連線
			 HttpURLConnection conn = (HttpURLConnection)realUrl.openConnection();
			// 設定通用的請求屬性
			conn.setRequestMethod("POST");
			// 傳送POST請求必須設定下面的屬性
			conn.setDoOutput(true);
			conn.setDoInput(true);
			conn.setUseCaches(false);
                        //設定請求屬性
			conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");
			conn.connect();
			// 獲取URLConnection物件對應的輸出流
			out = new PrintWriter(conn.getOutputStream());
			// 傳送請求引數
			out.print(JSON.toJSONString(json));
			// flush輸出流的緩衝
			out.flush();
			// 定義BufferedReader輸入流來讀取URL的響應
			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line = "";
			while ((line = in.readLine()) != null) {
				result += line;
			}
                        //將返回結果轉換為字串
			jsonObject = JSONObject.parseObject(result);
		} catch (Exception e) {
			throw new RuntimeException("遠端通路異常"+e.toString());
		}
		// 使用finally塊來關閉輸出流、輸入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return jsonObject;
	}