Login

package controller;

import model.CounterBean;
import model.DbManager;
import model.UtenteBean;
import sun.rmi.server.Dispatcher;

import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;



@WebServlet(name="Login")

public class  Login extends HttpServlet {
    private static final long serialVersionUID = 1L;

    // questo counter è visibile solo in questa servlet
    // e conta il numero di accessi totale da parte di chiunque accede a questa servlet
    // da quando viene deployed sul server
    private int servletCount;

    public void  init() throws ServletException {
        // inizializzazione
        servletCount = 0;
    }

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

        UtenteBean utente = new UtenteBean();

        utente = loginIsPresent(request,utente);

        if(utente == null){
            response.sendRedirect("login.jsp");

        }

        else{
            utente = retrieveUserData(utente);
            if(utente == null)
            {
                request.setAttribute("denied", true);
                RequestDispatcher requestDispatcher = request.getRequestDispatcher("login.jsp");
                requestDispatcher.forward(request, response);
            }
                   else{
                Cookie[] cookies = new Cookie[2];
                cookies[0] = new Cookie("username",utente.getUsername());
                cookies[1] = new Cookie("password",utente.getPassword());

                response.addCookie(cookies[0]);
                response.addCookie(cookies[1]);

                RequestDispatcher dispatcher = request.getRequestDispatcher("index.jsp");

                dispatcher.forward(request,response);

            }
        }

    }


    private UtenteBean loginIsPresent(HttpServletRequest request, UtenteBean utente) {


        utente = checkCookiesCredentials(request,utente);

        if(utente == null)
        {
            utente = checkParametersCredentials(request,utente);
        }

        return utente;
    }

private UtenteBean checkCookiesCredentials(HttpServletRequest request,UtenteBean utenteBean){

       Cookie[] cookies = request.getCookies();

    if(cookies != null){
        for (int i = 0; i < cookies.length; i++) {

            Cookie c = cookies[i];

            if(c.getName().equals("username"))  utenteBean.setUsername(c.getValue());
            if(c.getName().equals("password"))  utenteBean.setPassword(c.getValue());

        }
    }

    System.out.println(utenteBean);
    return utenteBean;

}

private UtenteBean checkParametersCredentials(HttpServletRequest request, UtenteBean utenteBean){

        utenteBean.setUsername(request.getParameter("username"));
        utenteBean.setPassword(request.getParameter("password"));

        return utenteBean;
}

private UtenteBean retrieveUserData(UtenteBean utenteBean){

        DbManager db = new DbManager();

    return db.userLogin(utenteBean);
}


    private CounterBean updateCounters(HttpServletRequest request) {

        servletCount++;     // aggiornamento livello di scoping -> servlet
        Integer sessionCount;   // livello di scoping -> session
        Integer applicationCount;  // livello di scoping -> application (servletContext)

        HttpSession session=request.getSession();      // lettura ed aggiornamento -> session
        sessionCount = (Integer)session.getAttribute("counter");
        if (sessionCount != null)
            sessionCount++;
        else
            sessionCount = 1;
        session.setAttribute("counter", sessionCount);

        ServletContext application = getServletContext();   // lettura ed aggiornamento -> application
        applicationCount = (Integer)application.getAttribute("counter");
        if (applicationCount != null)
            applicationCount++;
        else
            applicationCount = 1;
        application.setAttribute("counter", applicationCount);

        CounterBean cb = new CounterBean(servletCount, sessionCount, applicationCount);

        return cb;
    }


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doGet(request, response);

    }

}