Question

I need to create a File object out of a file path to an image that is contained in a jar file after creating a jar file. If tried using:

URL url = getClass().getResource("/resources/images/image.jpg");
File imageFile = new File(url.toURI());

but it doesn’t work. Does anyone know of another way to do it?

Answer 1

Usually, you can’t directly get a java.io.File object, since there is no physical file for an entry within a compressed archive. Either you live with a stream (which is best most in the cases, since every good API can work with streams) or you can create a temporary file:

    URL imageResource = getClass().getResource("image.gif");
    File imageFile = File.createTempFile(
            FilenameUtils.getBaseName(imageResource.getFile()),
            FilenameUtils.getExtension(imageResource.getFile()));
    IOUtils.copy(imageResource.openStream(),
            FileUtils.openOutputStream(imageFile));