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    <p>I think that @BalusC has nailed the direct problem in your code. I'd just like to point out some other issuse</p> <p>The <code>dir.toURI().toASCIIString()</code> and <code>URLEncoder.encoder(fn, "UTF-8").toString()</code> expressions actually do rather different things.</p> <ul> <li><p>The first one, encodes the URI as a string, applying the URI encoding rules according to the URI grammar. So for example, a '/' in the path component will not be encoded but a '/' in the query or fragment components will be encoded as %2F.</p></li> <li><p>The second one, encodes the <code>fn</code> String applying the encoding rules without reference to the content of the string.</p></li> </ul> <p>The <code>File(URI)</code> constructor's mapping from a file URI to a File is <a href="http://java.sun.com/javase/6/docs/api/java/io/File.html#File(java.net.URI)" rel="nofollow noreferrer">system dependent and undocumented</a>. I'm a bit surprised that it decodes the <code>%2F</code>, but it does what it does, and @BalusC explains why. The take-away is that it is potentially problematic to use a mechanism ("file:" URIs) that are explicitly system dependent.</p> <p>Finally, it is wrong to combine those URI component strings like that. It should be either</p> <pre><code>URI uri = new URI( dir.toURI().toString() + URLEncoder.encoder(fn, "UTF-8").toString(); </code></pre> <p>or</p> <pre><code>URI uri = new URI( dir.toURI().toASCIIString() + URLEncoder.encoder(fn, "ASCII").toString()); </code></pre>
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    1. POWhy does Java automatically decode %2F in URI encoded filenames?
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