public static JSONObject getMsgRetry(String url, JSONObject json) throws IOException{

		url = url + "?a=1";

		for(Entry<String, Object> entry : json.entrySet()){

			String key = entry.getKey();

			Object value = entry.getValue();

			url = url+"&"+key+"="+value;

		}

		HttpsURLConnection conn = HttpUtil.initHttpsConnectionKeepAlive(url, "GET");

		String result = "";

		try{

			result = HttpUtil.getHttpsContent(conn, "utf-8");

		}catch(Exception e){

			logger.error("interface_error, let's retry.");

			logger.error(e.toString());

			try {

				TimeUnit.SECONDS.sleep(2); // 延迟2秒，再重试

			} catch (InterruptedException e1) {

				logger.error(e1.toString());

			}

			result = HttpUtil.getHttpsContent(conn, "utf-8");

		}finally{

			conn.disconnect();

		}

		return JSONObject.parseObject(result);

	}

	public static String getHttpsContent(HttpsURLConnection conn,

			String characterCode) throws IOException {

		InputStream inputStream = conn.getInputStream();

		InputStreamReader inputStreamReader = new InputStreamReader(

				inputStream, characterCode);

		BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

		String str = null;

		StringBuffer buffer = new StringBuffer();

		while ((str = bufferedReader.readLine()) != null) {

			buffer.append(str);

		}

		// 释放资源

		bufferedReader.close();

		inputStreamReader.close();

		inputStream.close();

		conn.disconnect();

		return buffer.toString();

	}

while ((str = bufferedReader.readLine()) != null) {

			buffer.append(str);

		}

	public static String getHttpsContent(HttpsURLConnection conn, String characterCode) throws IOException {

		InputStream inputStream = conn.getInputStream();

		InputStreamReader inputStreamReader = new InputStreamReader(

				inputStream, characterCode);

		BufferedReader bufferedReader = new BufferedReader(

				inputStreamReader);

		// fix bug:  java.io.IOException: Premature EOF

		//        at sun.net.www.http.ChunkedInputStream.readAheadBlocking(ChunkedInputStream.java:565)

		// https://stackoverflow.com/questions/13210108/reading-a-web-page-in-java-ioexception-premature-eof

		StringBuffer sb = new StringBuffer();

		int BUFFER_SIZE = 1024;

		char[] buffer = new char[BUFFER_SIZE]; // or some other size,

		int charsRead = 0;

		while ( (charsRead  = bufferedReader.read(buffer, 0, BUFFER_SIZE)) != -1) {

			sb.append(buffer, 0, charsRead);

		}

		return sb.toString();

	}