获取http 403错误子状态

Question

我正在尝试在java代码中下载http文件。我一直得到例外403，我不确定具体原因。根据{{​​3}}，必须有一种方法来获得确切的子状态错误。

任何方式我们都可以在Java中获得substatus错误，以便我可以相应地修复它？

private void downloadFile()
{
    try
    {
        URL url = new URL("http://hostname/folder/fileName");
        URLConnection connection = url.openConnection();
        InputStream stream = connection.getInputStream();
        BufferedInputStream in = new BufferedInputStream(stream);
        int length = 0;
        byte[] data = new byte[1024];
        while ((length = in.read(data)) != -1)
        {
            System.out.write(data);
        }
        in.close();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

java.io.IOException: 
Server returned HTTP response code: 403 for URL: http://hostname/folder/fileName
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)