import javax.servlet.*;

public class Model2Servlet extends GenericServlet {

  public void service(ServletRequest request, ServletResponse response) 
    throws ServletException, java.io.IOException {

    String userName = request.getParameter("userName");
    String password = request.getParameter("password");

if (userName==null) {
      RequestDispatcher rd = request.getRequestDispatcher("/Login.jsp");
      rd.forward(request, response);
    }
    else {
      if (password!=null && userName.equals("aibo") 
  && password.equals("kitada")) {
        // login successful
        RequestDispatcher rd = request.getRequestDispatcher("/Welcome.jsp");
        rd.forward(request, response);
      }
      else {
        // login failed
        request.setAttribute("error", "yes");
        RequestDispatcher rd = request.getRequestDispatcher("/Login.jsp");
        rd.forward(request, response);
      }
    }
  }
}