[HELP] Lưu lại giá trị khi Submit form sai ??

code sơ sài lắm, mình muốn khi login ko thành công mà vẫn giữ đc các giá trị đã tick ở checkbox trc đó và tên username đã nhập !!

1. Trang FirstJSP.jsp :

<%@ page contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%>

2. Trang Servlet1.java :

package com.hai.demo;

import java.io.IOException;

import java.io.PrintWriter;
import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/Servlet1")

public class Servlet1 extends HttpServlet {

private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {

String username = request.getParameter("Name");

String password = request.getParameter("Pass");

response.setContentType("text/html");

PrintWriter out = response.getWriter();

if (username.equals("hai") && password.equals("123")) {

out.println("Welcome to JSP!!!");

} else {
String message = " Nhap sai Username/Password !";

request.setAttribute("username", username);

request.setAttribute("message", message);
request.getRequestDispatcher("/FirstJSP.jsp").forward(request,response);
}}}