CheckLogin

package letien.acf;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class CheckLogin
 */
/**@WebServlet("/CheckLogin")**/
public class CheckLogin extends HttpServlet {
private static final long serialVersionUID = 1L;
     
    /**
     * @see HttpServlet#HttpServlet()
     */
    public CheckLogin() {
        super();
        // TODO Auto-generated constructor stub
    }

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String us = request.getParameter("user");
String pa = request.getParameter("pass");


// if ((us == "letien") && (pa == "Abc"))
{
PrintWriter write = response.getWriter();
write.println("thanh cong");
}
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String us = request.getParameter("user");
String pa = request.getParameter("pass");

PrintWriter write = response.getWriter();

if (us.equals("letien")&&pa.equals("Abc"))
{
//RequestDispatcher dispatcher = request.getRequestDispatcher("XacNhan.jsp");
response.sendRedirect("XacNhan.jsp");
//write.println("ok");
}
else
write.println("Username or Password is incorrect");

}



}

Tài liệu hướng dẫn : http://www.coreservlets.com/javascript-jquery-tutorial/#getting-started