Java URL – File gotcha!

November 27, 2006

This one can come up frequently if you’re loading file resources using a ClassLoader. You get a java.net.URL object from the ClassLoader, and you want a java.io.File.

This is wrong: –


File file = new File(url.getFile());

For some reason under windows, URL.getFile() isn’t equivalent to the path of the file. The correct way of getting a file from a URL is: –


File file = new File(url.toURI());

If anyone has any bright ideas of why there isn’t a File(URL) constructor that just takes a URL and barfs if it’s not a file protocol URL, please let me know!

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