@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {

    req.getRequestDispatcher("index.jsp").forward(req, resp);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    PrintWriter pw = response.getWriter();
    response.setContentType("text/html");

    String user = request.getParameter("userName");
    String pass = request.getParameter("userPassword");

    if (user.equals("admin") && pass.equals("admin")) {
        response.sendRedirect("/admin");
    }
    if (user.equals("user") && pass.equals("user")) {
        response.sendRedirect("/user");
    }
    if (user.equals("page3") && pass.equals("page3")) {
        response.sendRedirect("page3.jsp");
    }
    else
        pw.println("Login Failed...!");
    pw.close();

}