java web 下载本地文件并弹出下载框

 window.open("/dept/download")

jsp代码

 @RequestMapping(value = "/download", method = RequestMethod.GET)
     public void downstudents(HttpServletRequest request, HttpServletResponse response) throws IOException {
         String filename = request.getSession().getServletContext().getRealPath("/static/email/");
         String filenameZip = filename + "\\dept.xls";

         try {
             response.setContentType("application/x-execl");
             response.setHeader("Content-Disposition",
                     "attachment;filename=" + new String(("dept.xls").getBytes(), "UTF-8"));
             // 读取文件
             InputStream in = new FileInputStream(filenameZip);
             ServletOutputStream outputStream = response.getOutputStream();
             // 写文件
             int b;
             while ((b = in.read()) != -1) {
                 outputStream.write(b);
             }

             in.close();
             outputStream.close();
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

     }

javaCode