我正在开发一个注册网页的网站。我想将用户详细信息存储在googleappengine上的mysql数据库表中。下面是jdbc连接url:-

Connection  con = DriverManager.getConnection("jdbc:mysql://google/my_database_name?cloudSqlInstance=my_db_instance&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=My_Username&password=My_Password&useSSL=false", "root", "My_Password");

但是这个url在注册后仍然不能正常工作，我的数据库表中没有存储任何详细信息。所以，你有什么建议吗。谢谢您
下面是registrationservlet代码，它从register.jsp获取输入值，我希望它将这些值存储到我的gcloud db中table:-

@WebServlet("/RegistrationServlet")
public class RegistrationServlet extends HttpServlet {
 private static final long serialVersionUID = 1 L;

 public RegistrationServlet() {
  super();

 }

 @Override
 protected void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {

 }

 @Override
 protected void doPost(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {

  PrintWriter out = response.getWriter();

  String first_name = request.getParameter("f1");
  String last_name = request.getParameter("l1");
  String phone = request.getParameter("p1");
  String email = request.getParameter("e1");
  String uname = request.getParameter("uname");
  String user_dob = request.getParameter("udate");
  String password = request.getParameter("pwd");

  UserData ud = new UserData();

  ud.setFirst_name(first_name);
  ud.setLast_name(last_name);
  ud.setUname(uname);
  ud.setPhone(phone);
  ud.setEmail(email);
  ud.setUser_dob(user_dob);
  ud.setPassword(password);

  // validate given input
  if (first_name.isEmpty() || last_name.isEmpty() || phone.isEmpty() || email.isEmpty() || password.isEmpty()) {
   RequestDispatcher rd = request.getRequestDispatcher("Register.jsp");
   out.println("<font color=red>Please fill all the fields</font>");
   rd.include(request, response);
  } else {
   try {
    Class.forName("com.mysql.jdbc.Driver");
   } catch (ClassNotFoundException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   // loads mysql driver

   try {
    Connection con = DriverManager.getConnection("jdbc:mysql://google/my_database_name?cloudSqlInstance=my_db_instance&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=My_Username&password=My_Password&useSSL=false", "root", "My_Password");

    String query = "insert into users values(?,?,?,?,?,?,?)";

    PreparedStatement ps = con.prepareStatement(query); //generates sql query

    ps.setString(1, first_name);

    ps.setString(2, last_name);

    ps.setString(3, uname);

    ps.setString(4, phone);

    ps.setString(5, email);

    ps.setString(6, user_dob);

    ps.setString(7, password);

    ps.executeUpdate();

    System.out.println("successfully inserted");

    ps.close();

    con.close();

   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   HttpSession session = request.getSession();
   session.setAttribute("username", first_name);
   response.sendRedirect("Success.jsp");

  }
 }