URL "protected"

[Ricardo Gil]

my url is http://test.jsp?cod=3
it's ok!
but if anybody change it to test.jsp?sdjhsds, then return a error!
how i can "protect" it, returning my default error: "parameters incorrects"
tnks/////

[Tim Holloway]

String cod = request.getParameter("cod");
if ( cod == null ) {
  throw new Exception("Invalid request");
}

and provide an error page. That's one way to do it. The key here is that if the parameter wasn't sent, it will always be null.

[Ricardo Gil]

ok man!!!
it's work,,, and at top of my jsp i put
<%@ page errorPage="index.jsp" %>
and when error occurs it redirect to index page!!!