LoginServlet.java

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package controller;

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;

/**
 *
 * @author nim_13515091
 */
@WebServlet(name = "LoginServlet", urlPatterns = {"/Login"})
public class LoginServlet extends HttpServlet {

    /**
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        String userPath = request.getServletPath();

        // use RequestDispatcher to forward request internally
        String url = "/WEB-INF/view/login" + userPath + ".jsp";

        try {
            request.getRequestDispatcher(url).forward(request, response);
        } catch (IOException | ServletException ex) {
        }
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        String userPath = request.getServletPath();

        // if addToCart action is called
        if (userPath.equals("/Login")) {
            // TODO: Implement add product to cart action
            
        // if updateCart action is called
        } 

        // use RequestDispatcher to forward request internally
        String url = "/WEB-INF/view/login" + userPath + ".jsp";

        try {
            request.getRequestDispatcher(url).forward(request, response);
        } catch (IOException | ServletException ex) {
        }
    }

}