@RequestMapping("/download")

    public ResponseEntity<byte[]> download(HttpServletRequest req)

            throws IOException {

        HttpHeaders headers = new HttpHeaders();

        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        //解决中文名称乱码问题

        String filename = new String("你好.xls".getBytes("UTF-8"), "iso-8859-1");

        headers.setContentDispositionFormData("attachement", filename);

        String realpath = req.getSession().getServletContext()

                .getRealPath("/resources/upload/");

        String pathname = realpath + File.separator + "123";

        File file = new File(pathname);

        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),

                headers, HttpStatus.CREATED);

    }