LoginServlet.java

package com.roshka.proyectofinal.login;


import java.io.IOException;
import java.io.PrintWriter;
import java.security.NoSuchAlgorithmException;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import com.roshka.proyectofinal.entity.LoginBean;
import com.roshka.proyectofinal.login.md5JavaHash;
import jakarta.servlet.http.HttpSession;

import static java.lang.System.out;


/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // 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 stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        LoginDao loginDao = new LoginDao();
        md5JavaHash passEncrip = new md5JavaHash();
        String passwordMD5 = "";
        PrintWriter out = response.getWriter();

        String username = request.getParameter("username");
        String correo = request.getParameter("correo");
        String password = request.getParameter("password");
        LoginBean loginBean = new LoginBean();
        loginBean.setUsername(username);
        try {
            passwordMD5 = passEncrip.getHashPass(password);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        out.println(passwordMD5);
        loginBean.setPassword(passwordMD5);
        loginBean.setCorreo(correo);

        out.println("EL pass encriptado es: " +passwordMD5);

        if (loginDao.validate(loginBean))
        {
                HttpSession session = request.getSession(true); //incluir nota de sesion valida
                session.setAttribute("logon.isDone", username);



                // Tratar de re-dirigir a la pagina que el usuario quiso acceder
                try {
                    String target = (String) session.getAttribute("login.target");
                    response.sendRedirect("loginSuccess.jsp");
                    if (target != null)
                        response.sendRedirect(target);
                    return;
                }
                catch (Exception ignored) { }

                // Si no es posible redireccionar a la pagina solicitada, llevar a la main page
                //response.sendRedirect(request.getScheme() + "://" +
                       // request.getServerName() + ":" + request.getServerPort());
                System.out.println("redirigir al index.html");

        } else {

            //si no es un user valido - mandar error y redireccionar al inicio de sesion

            out.println("<p> You may want to <a href='/login.jsp'> try again </a> </p>");
//            request.getRequestDispatcher("login.jsp").include(request, response);
//            response.sendRedirect("login.jsp");
            }
    }



}