From a java.net.URL containing a file (file:///path/to/file) to a java.nio.FileChannel

Question

Is it possible? Basically I have a local binary file represented by:

file:///path/to/myfile.dat

I want to read this file using ByteBuffers, in other words, I believe I need a FileChannel from the given URL to do that.

Any hope?

@JohnD It is a URL. It has a scheme and a scheme-dependent part. — user207421
– user207421, Commented Oct 30, 2017 at 0:10
@JohnD I tried with my browser and I can open a local file. The correct URL has 3 '/' instead of 2 (my bad) => file:///path/to/mylocalfile.dat (Obs: I fixed my original URL that had incorrectly two '/' instead of 3) — LatencyFighter
– LatencyFighter, Commented Oct 30, 2017 at 0:11

user207421 · Accepted Answer · 2017-10-30 00:12:35Z

1

Yes, just get the path out of the URL and open it with FileChannel.open().

answered Oct 30, 2017 at 0:12

user207421

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1 Comment

VGR Over a year ago

Calling URL.getPath() or URL.getfile() will not return a valid filename. It will return the path portion of the URL, with all percent escapes. A URL should be converted to a Path with Paths.get(url.toURI()).

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