Softwareprojektmanagement/src/main/java/de/hsel/spm/baudas/web/LoginServlet.java

package de.hsel.spm.baudas.web;

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;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class LoginServlet.
 *
 * @author Edgar Schkrob
 */

@WebServlet("/login")
public class LoginServlet extends HttpServlet {

    private final String password = "SPM2019SS";

    /**
     * This is a Servlet that manages the Login and creates Sessions.
     * @param request This parameter provides access to everything the code needs to work.
     * @param response This parameter provides access to everything the code needs to issue a response.
     * @throws ServletException Defines a general exception a servlet can throw when it encounters difficulty.
     * @throws IOException Signals that an I/O exception of some sort has occurred. This class is the general class of exceptions produced by failed or interrupted I/O operations.
     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        if (this.password.equals(password)) {
            HttpSession newSession = request.getSession(true);
            newSession.setAttribute("authentication", true);
            newSession.setMaxInactiveInterval(5*60*60); //setting session to expiry in 5 hours
            response.sendRedirect("index.jsp");
        } else {
            RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.html");
            PrintWriter out = response.getWriter();
            out.println("<font color=red>Das eingegebene Passwort ist falsch.</font>");
            rd.include(request, response);
        }
    }
}