Baixar um arquivo de um servidor remoto

DownloadResource.java

try {
    URL url = new URL("http://127.0.0.1/scripts/download.php");

    ReadableByteChannel readableByteChannel = Channels.newChannel(url.openStream());

    FileOutputStream fileOutputStream = new FileOutputStream("resourceFileName.db");

    fileOutputStream.getChannel().transferFrom(readableByteChannel, 0, Long.MAX_VALUE);
  
} catch (Exception ex) {

}