public static void main(String[] args) throws IOException, InterruptedException {

        WatchService watchService = FileSystems.getDefault().newWatchService();

        Paths.get("c:/").register(watchService, StandardWatchEventKinds.ENTRY_CREATE,StandardWatchEventKinds.ENTRY_DELETE,StandardWatchEventKinds.ENTRY_MODIFY);

        while(true){

            WatchKey key = watchService.take();

            for (WatchEvent<?> event :

                    key.pollEvents()) {

                System.out.println(event.context()+" File occur"+event.kind()+"event!");

            }

            boolean valid = key.reset();

            if(!valid){

                break;

            }

        }

    }

新建文件夹 File occurENTRY_CREATEevent!

新建文件夹 File occurENTRY_DELETEevent!