How to execute a logic in backing before page is loaded?

Question

Hi guys,
I need to exeute a login in backing bean before the page is load. For instance, when user goto
http://forums.java.sun.com/thread.jsp?forum=427&thread=563631
the page will
<% request.setAttribute("forumid",request.getParameter("forum")) %>
<% request.setAttribute("threadid",request.getParameter("thread")) %>
<% --- Call backing bean logic here --%>
then the backing bean will be like
public class ThreadBean {
public String retrieveThreadData(){
FacesContext context = FacesContext.getCurrentInstance();
String threadid = context.getExternalContext().getRequestParameterMap().get("threadid");
String forumid = context.getExternalContext().getRequestParameterMap().get("forumid");
getThreafData(threadid, forumid);
return "success";
Hence, the page will be able to display all the data by the thread id. Appreciate any comment or example, Thank you !!
regards,
kmthien

Answer 1

U may need to check like
FacesContext.getCurrentInstance().getExternalContext().getRequestServletPath().equals("blah.jsp");
in the beginning of the function if it's the intend URL who call this function. This function will call several time if u don't check ServletPath.