How to cancel Files.copy() in Java?

Question

I\'m using Java NIO to copy something:

Files.copy(source, target);

But I want to give users the ability to cancel this (e.g. if the file is

Answer 1

Use the option ExtendedCopyOption.INTERRUPTIBLE.

Note: This class may not be publicly available in all environments.

Basically, you call Files.copy(...) in a new thread, and then interrupt that thread with Thread.interrupt():

Thread worker = new Thread() {
    @Override
    public void run() {
        Files.copy(source, target, ExtendedCopyOption.INTERRUPTIBLE);
    }
}
worker.start();

and then to cancel:

worker.interrupt();

Notice that this will raise a FileSystemException.