somefile = new URL("http://somefile.rar");
ReadableByteChannel rbc = Channels.newChannel(somefile.openStream());
FileOutputStream fos = new FileOutputStream("test");
long start = System.currentTimeMillis();
fos.getChannel().transferFrom(rbc, 0, 1 << 24);
long end = System.currentTimeMillis();
System.out.println(end-start);

URL url = new URL("http://yourfile.rar");
File target = new File("package.rar");

try (BufferedInputStream bis = new BufferedInputStream(url.openStream())) {
    try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(target))) {
        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = bis.read(buffer)) != -1) {
            bos.write(buffer, 0, bytesRead);
        }
        bos.flush();
    }
}

IOUtils.copy(new BufferedInputStream(somefile.openStream()),
       new BufferedOutputStream(fos));
// of course, you'd have to close the streams at the end.

FileUtils.copyUrlToFile(URL url, String destination);