获取上载文件的MultipartFile数量

Question

I have a method that processes the POST request for files using MultipartFile.

@PostMapping(value = "/payment-files", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) 
public PaymentFileStatus postPaymentFile(
         @RequestParam("paymentFile") MultipartFile file,
) {
    byte[] fileBytes;
    try {
        fileBytes = file.getBytes();
    } catch (IOException e) {
        throw new PublicException(MESSAGE_NOT_READABLE, e);
    }

    return foo(fileBytes);
}

My task is to reject the request if more than one file is uploaded. I was wondering if I somehow can get the number of uploaded files from the MultipartFile object? Or do you have any other ideas how to check how many files were uploaded? Or maybe I should use @PreAuthorize ? Or maybe the validation should be implemented in other place? Thanks!

Answer 1

@RequestParam("paymentFile") MultipartFile file,

更改为@RequestParam("paymentFile") List<MultipartFile> file,此后，您可以获得上载的数字文件。

Answer 2

Try this.

Pass multiple MultipartFile files in array.

@PostMapping(value = "/payment-files", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) 
public PaymentFileStatus postPaymentFile(
         @RequestParam("paymentFile") MultipartFile[] file
) {
    byte[] fileBytes;
    try {
        fileBytes = file.getBytes();
    } catch (IOException e) {
        throw new PublicException(MESSAGE_NOT_READABLE, e);
    }

    return foo(fileBytes);
}

Refer :- Solution