弹出一个IE的下载对话框

protected void downloadExcel(HSSFWorkbook workbook, HttpServletResponse response, String filename) throws IOException {

        OutputStream out = response.getOutputStream();

    response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));

    response.setContentType("application/msexcel;charset=UTF-8");

    workbook.write(out);

    out.close();        

}