Login servlet

package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import dao.LoginBean;
import doa.UserDOA;

/**
 * Servlet implementation class LoginServlet
 */
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * Default constructor.
     */
    public LoginServlet() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stubt
       
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        PrintWriter out = response.getWriter();
        LoginBean lbean = new LoginBean();
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        lbean.setUsername(username);
        lbean.setPassword(password);
       
            
        lbean = UserDOA.login(lbean);
       
        if(lbean.isValid()){
            HttpSession session = request.getSession(true);
             session.setAttribute("currentSessionUser",lbean);
             response.sendRedirect("RegisteredUser.jsp"); //logged-in page
           }else{
            //out.println("<h1> Username and Password Not Matched </h1>");
            response.sendRedirect("InvalidUser.jsp"); //error page
        }
         
         
               
    }

}