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servletsjakarta-eescriptlet

Access Get parameter with a scriptlet

I hava a url such as search.do?offset=20

offset sometimes is in the url sometimes not. When it is not in the URL i want it to be 0.

i try, without success, to retrieve the value with a scriptlet as follows: 

<%  Integer offset = (pageContext.findAttribute("offset")==null) ? new Integer("0") : new Integer((String) pageContext.findAttribute("offset")); %>

Anyone knows what i am doing wrong?

Solution

  • You should use this instead.

    <% Integer offset = request.getParameter("offset") != null && request.getParameter("offset").length() > 0 ? new Integer(request.getParameter("offset")) : new Integer(0); %>

    Be careful because if "offset" parameter has an incorrect integer representation a NumberFormatException will be thrown.

    This is basic JSP. You could use Struts or other J2EE framework that make these conversions safer for you.