<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> Insert title here
Korisnicko ime
Sifra

<% if(request.getParameter("id")!=null &&request.getParameter("id").equals("-1") ) out.print("Username vec postoji"); %> <% if(request.getParameter("id")!=null &&request.getParameter("id").equals("-3") ) out.print("Username i password moraju biti alfanumericnog tipa"); %>