利用WatchService监控C盘根目录下的文件情况

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;
            }
        }
    }

当在C盘根目录下创建文件和删除文件时：

新建文件夹 File occurENTRY_CREATEevent!
新建文件夹 File occurENTRY_DELETEevent!