How to get the page request parameters in Command Button code

Hi everyone,
I am new to JSF and working on some Command Buttons. I put my java code via Edit Event, it works fine. But I don't know how to get some parameters from HttpServletRequest.
Can anyone give some guidance? It would be much appreciated.
Mike

Thanks a lot for your tip. Unfortunately I could not open the link you provided due to some network issue.
Yes, I intend to get some parameters from URL. I did try to put your code and get the parameters predefined in the URL, however I got the null returned. By the way, I put the following code in the page source part and it works. Just don't know how to get the value being passed to the command button event code.
<%
String userID = request.getParameter("u");
System.out.println("this is from head - the userID is :: " + userID);
%>
Thanks again and hope you could give me further advice.

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