response.setHeader("Content-disposition", "attachment; filename=executionCourseGroupings.xls");
response.setHeader("Content-disposition", "attachment; filename=executionCourseGroupings_" + executionPeriod.getQualifiedName().replace(' ', '_') + "_.xls");
    public ActionForward downloadExecutionCourseGroupings(ActionMapping mapping, ActionForm form, HttpServletRequest request,            HttpServletResponse response) throws Exception {        final ExecutionPeriod executionPeriod = retrieveDomainObject(form, request);        response.setContentType("application/vnd.ms-excel");        response.setHeader("Content-disposition", "attachment; filename=executionCourseGroupings.xls");        final ServletOutputStream servletOutputStream = response.getOutputStream();        exportToXls(servletOutputStream, executionPeriod);        servletOutputStream.flush();        response.flushBuffer();        return null;    }