How to create File object from InputStream

Hi everybody
Can I know a way to create a File object from InputStream object
Here's my code:
URL url = loader.getResource(xsdFile); //Thats a schema file..not to worry
InputStream istream = url.openStream();
Now from that 'istream' I need to build File object.
Thank you all

didn't know fileinputstream was made to read url objects ; in the doc, it just says "A FileInputStream obtains input bytes from a file in a file system." ; according to me, website is something outside the filesystem, but i could be wrong
edit: thought from the beginning it was all about FILEinputstream whereas it just says "inputstream" in the post ; my bad, it's still early in the morning here X)

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