@RestController
@RequestMapping("/antdUpload")
public class AntdUpload {

    private Logger logger = LoggerFactory.getLogger(AntdUpload.class);

    @RequestMapping(method = RequestMethod.PUT)
    public void postExcel(@RequestParam("file")MultipartHttpServletRequest request, HttpServletResponse response) throws IOException {

        logger.info("antd-upload");

        //1. build an iterator
        Iterator<String> itr = request.getFileNames();
        MultipartFile mpf = null;

        //2. get each file
        while (itr.hasNext()) {

            //2.1 get next MultipartFile
            mpf = request.getFile(itr.next());

            InputStream is = mpf.getInputStream();

        }
    }
}

as a result, there is no request at all in the backend. I don"t know what the problem is.