使用Apache Commons在Java中下载文件时获取HTTP 302
[英]Getting HTTP 302 when downloading file in Java using Apache Commons
问题描述
I am using the following method to download a file off the internet: 
我正在使用以下方法从Internet下载文件：
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: 但是下载的文件不是jar，而是具有以下内容的HTML文件：
<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. 在使用浏览器（在我的情况下为Google Chrome）访问时，它直接下载，但是在使用FileUtils时下载不正确。
How do I properly download a file with FileUtils? 如何使用FileUtils正确下载文件？
2 个解决方案
解决方案1
0 已采纳 2015-06-15 18:38:30
The code 302 refers to a relocation. 代码302是指重定位。 The correct url will be transmitted in the location header. 正确的网址将在位置标头中传输。 Your browser then fetches the file form there. 然后，您的浏览器在那里获取文件格式。 See https://en.wikipedia.org/wiki/HTTP_302 参见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 尝试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? 对于FileUtils，请参阅如何正确使用FileUtils IO？
解决方案2
0 2015-06-15 18:51:35
You could use ApacheHttpClient instead FileUtils. 您可以使用ApacheHttpClient代替FileUtils。 Httpclient can support the redirection. Httpclient可以支持重定向。
something like this 像这样的东西
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();
}
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