Java 中文件上传

• 直接在FormData里携带文件

    public void File(MultipartFile file, String id) throws IOException {
      // 获取输入流/文件名/扩展名~~~~
      InputStream is = file.getInputStream();
      String fileName = file.getOriginalFilename();
      String ext = fileName.substring(fileName.lastIndexOf("."));
    }

• 文件上传到OSS后返回文件名

  public void File(String fileName, String id) throws IOException {
    //根据文件名获取完整路径
    String fullPath = getPath(fileName);
    if (isResourceExist(fullPath)) {
      throw new ServiceException("文件不存在");
     }
    URL httpUrl = new URL(fullPath);
    URLConnection urlConnection = httpUrl.openConnection();
    InputStream is = urlConnection.getInputStream();
  }