este es el punto final de la API de arranque de primavera que recibe la solicitud de la interfaz de reacción js

 @PostMapping(value = "/upload", consumes = {MediaType.APPLICATION_JSON_VALUE, MediaType.MULTIPART_FORM_DATA_VALUE}) public ResponseEntity<MessageResponse> uploadFile(@RequestPart("fileDB") String fileDB, @RequestPart("file") MultipartFile file) { String message = ""; try { storageService.store(file, fileDB); message = "Uploaded the file successfully: " + file.getOriginalFilename(); return ResponseEntity.status(HttpStatus.OK).body(new MessageResponse(message)); } catch (Exception e) { message = "Could not upload the file: " + file.getOriginalFilename() + "!"; return ResponseEntity.status(HttpStatus.EXPECTATION_FAILED).body(new MessageResponse(message)); } }