Multiple Redirects through Servlet

I am very new to jsp and java servlets. I am trying to put a processing page that appears while some work is done and then the servlet redirects to a output page that displays reports. I am not sure how to do this.
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //send initial redirect to a processing page
    //do some work
    RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/reportOutput.jsp");
    dispatcher.forward(request, response);
}Any ideas?

Use Javascript to display a hidden <div> element with some animated gif when the submit button is pressed.
If you really want an intermediate page, then you need to fire a new thread to do the progress and use the meta refresh header or ajaxical techniques to check the current progress.

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