@PostMapping("/push")
    public void push(@PathVariable MultipartFile file) throws IOException {
        if (Objects.isNull(file) || file.isEmpty()) {
            return;
        }
        String filename = StringUtils.cleanPath(Objects.requireNonNull(file.getOriginalFilename()));
        Path modelLocation = Paths.get(EXCEL_LOCATION);
        if (!Files.exists(modelLocation)) {
            Files.createDirectories(modelLocation);
        }
        Path resolve = modelLocation.resolve(filename);
        Files.copy(file.getInputStream(), resolve, StandardCopyOption.REPLACE_EXISTING);
        //file.transferTo(resolve);  //直接transferTo
    }
    
@PostMapping("/down")
    public void download(@RequestBody String uri, HttpServletResponse response) throws IOException {
        File file = new File(uri);
        if (!file.exists()) {
            throw new ServiceException("文件不存在");
        }
        String filename = FilenameUtils.getName(uri);
        try (FileInputStream fileInputStream = new FileInputStream(file);
             BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
             BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(response.getOutputStream())) {
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
            response.addHeader("Content-Length", "" + file.length());
            FileCopyUtils.copy(bufferedInputStream, bufferedOutputStream);
        } catch (Exception e) {
            log.warn(e.toString());
        } finally {
            log.info("结束");
        }
    }