如何在jsp中使用javascript对文件MIME类型进行验证

Question

how to do validation for file MIME type using with javascript in jsp. Kindly suggest on same. Whether we can do in client side validation or server side validation .

Answer 1

Regarding the validation it depends. If you allow any user to upload a file then the validation should definately happen server side. If the file upload is done from a CMS where only a couple of trusted users have access then you could also rely on a client-side validation(although I would still go with server side).

Now, in order to check the uploaded file's MIME type it should be fairly easy. You can use the following:

$fileInfo = finfo_open(FILEINFO_MIME_TYPE);
$fileType = finfo_file($fileInfo, $file);
finfo_close($fileInfo);