public class HttpServer extends NanoHTTPD {

  public HttpServer(int port) {
    super(port);
  }

  @Override
  public Response serve(IHTTPSession session) {

    HashMap<String, String> files = new HashMap<>();
    Method method = session.getMethod();

    if (Method.POST.equals(method)) {
      try {
        //notice:If the post with body data, it needs parses the body,or it can't get the body data;
        session.parseBody(files);
      }catch (IOException e) {
        return newFixedLengthResponse(Response.Status.INTERNAL_ERROR, MIME_PLAINTEXT,
            "SERVER INTERNAL ERROR: IOException: " + e.getMessage());
      }catch (ResponseException e) {
        return newFixedLengthResponse(e.getStatus(), MIME_PLAINTEXT, e.getMessage());
      }
    }

    final String postData = files.get("postData");

    String transJson = Transmit.getInstance().getAuthoriseData(postData);

    return newFixedLengthResponse(transJson);
  }

final String postData = files.get("postData");