Getting HTTP 302 when downloading file in Java using Apache Commons

Question

Getting HTTP 302 when downloading file in Java using Apache Commons

2.2k views Asked by Anon10W1z At 12 September 2024 at 18:33

I am using the following method to download a file off the internet:

try {
    URL url = new URL("http://search.maven.org/remotecontent?filepath=com/cedarsoftware/json-io/4.0.0/json-io-4.0.0.jar");
    FileUtils.copyURLToFile(url, new File(jsonerFolder.getParent() + "\\mods\\json-io-4.0.0.jar"));
} catch (Exception e1) {
    logger.error("Downloading json-io failed with an exception");
    e1.printStackTrace();
}

But the downloaded file is not a jar, rather, it is an HTML file with the following content:

<html>
<head><title>302 Found</title></head>
<body bgcolor="white">
<center><h1>302 Found</h1></center>
<hr><center>nginx/0.8.55</center>
</body>
</html>

It downloads directly when accessed in a browser (in my case, Google Chrome) but it doesn't download correctly when using FileUtils.

How do I properly download a file with FileUtils?

Original Q&A

There are 2 answers

Dmitry Zaytsev On 15 June 2015 at 18:51

You could use ApacheHttpClient instead FileUtils. Httpclient can support the redirection.

something like this

var httpclient = new DefaultHttpClient();

var httpget = new HttpGet('http://myserver/mypath');
var response = httpclient.execute(httpget);
var entity = response.getEntity();
if (entity != null) {
    var fos = new java.io.FileOutputStream('c:\\temp\\myfile.ext');
    entity.writeTo(fos);
    fos.close();
}

**Christian Fries** · Accepted Answer · 2015-06-15 18:38:30

The code 302 refers to a relocation. The correct url will be transmitted in the location header. Your browser then fetches the file form there. See https://en.wikipedia.org/wiki/HTTP_302

Try https://repo1.maven.org/maven2/com/cedarsoftware/json-io/4.0.0/json-io-4.0.0.jar

For FileUtils see How to use FileUtils IO correctly?

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Getting HTTP 302 when downloading file in Java using Apache Commons

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