How to download file from internet in java

Question

I have a problem when I want to download file from internet in java. I try to used something like this:

    String stringUrl = "http://imageshack.us/a/img841/7762/formd.png";
    File file = new File("");       
        try {
            URL url = new URL(stringUrl);
            FileUtils.copyURLToFile(url, file);
        }

but I got an I/O exception. What is the best way to download file from internet and put it into 'File' object?

You can find your answer from: stackoverflow.com/questions/921262/… — Navand
– Navand, Commented Apr 25, 2013 at 12:19
...but beware of the +146 odd first answer to that question that uses the arbitrary 1<<24 value. It'll work fine in this case because it's a simple image, but for most cases where you don't really know or want to guess the file size, I'd just use Long.MAX_VALUE. FWIW, I tihnk this Apache Commons approach is neater. — Michael Berry
– Michael Berry, Commented Apr 25, 2013 at 12:29

Michael Berry · Accepted Answer · 2013-04-25 12:25:30Z

1

That's because you haven't given the file a name, and writing to a file with no name makes no sense.

File file = new File("");

If you replace that line with something like:

File file = new File("x.png");

...then it should work.

answered Apr 25, 2013 at 12:25

Michael Berry

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2 Comments

caro2 Over a year ago

OMG, That was really easy! Now it works, but what should I do if I don't know an extension of downloaded file? Maybe split my URL string and got this extension? Or is a different and easier way?

Michael Berry Over a year ago

You could, but a more reliable way would be to get the content type as detailed here: stackoverflow.com/questions/5801993/…

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