new File(String url, String child) modify url

问题

I'm trying to create a new File passing a url as parent pathName and the fileName as child.

File savedFile = new File(Path.getPathDocumentAttach(), renameTo);

The path Path.getPathDocumentAttach() is correct, but the url "https://...." it's modified to "https:/...." (with only 1 "/").

So, when I pass savedFile to FileItem.write(savedFile) I got a java.lang.NullPointerException.

What am I doing wrong? What can I do to make it works?

ps. I want to save the file in the url I'm passing as first parameter (new File(URL(it's a string), "name"))

来源：https://stackoverflow.com/questions/62044306/new-filestring-url-string-child-modify-url