Java 文件上传

public ResponseDTO<?> uploadFile(@RequestParam("file") MultipartFile multipartFile) {
    //线上
    //String realPath = "/data/upload/";
    //本地
    String realPath = "F:\\javaUpload\\";
    String originalFilename = multipartFile.getOriginalFilename();
    //后缀
    String suffix = Objects.requireNonNull(originalFilename).substring(originalFilename.lastIndexOf(".") + 1);
    if (!suffix.equals("xlsx")) {
        return ResponseDTO.fail("文件格式不支持");
    }
    //创建文件夹
    File repositoryFile = new File(realPath);
    if (!repositoryFile.exists()) {
        repositoryFile.mkdirs();
    }
    //重新生成文件名
    String filename = UUID.randomUUID() + "." + suffix;
    String storePath = realPath + filename;

    InputStream inputStream = null;
    FileOutputStream outputStream = null;
    try {
        inputStream = multipartFile.getInputStream();
        outputStream = new FileOutputStream(new File(storePath));
        byte[] buffer = new byte[1024];
        int len;
        while ((len = inputStream.read(buffer)) > 0) {
            outputStream.write(buffer, 0, len);
        }
        HashMap<String, String> map = new HashMap<>();
        map.put("filename", filename);
        map.put("localPath", storePath);
        return ResponseDTO.success(map);
    } catch (Exception e) {
        log.error("文件上传失败", e.getMessage());
        return ResponseDTO.fail("文件上传失败");
    } finally {
        try {
            outputStream.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}