您可以直接使用apache，如此处所述https://commons.apache.org/proper/commons-
fileupload/streaming.html。

@Controller
public class UploadController {

    @RequestMapping("/upload")
    public String upload(HttpServletRequest request) throws IOException, FileUploadException {

        ServletFileUpload upload = new ServletFileUpload();

        FileItemIterator iterator = upload.getItemIterator(request);
        while (iterator.hasNext()) {
            FileItemStream item = iterator.next();

            if (!item.isFormField()) {
                InputStream inputStream = item.openStream();
                //...
            }
        }
    }
}

确保禁用弹簧多段分解机构。

application.yml：

spring:
   http:
      multipart:
         enabled: false