java 监控文件夹 WatchService

原文链接 ：http://blog.csdn.net/lirx_tech/article/details/51425364

    public class WacthFileUtil {
        public static void main(String[] args) {
            //define a folder root
            Path myDir = Paths.get("test\\phone");
            while (true) {
                try {
                    WatchService watcher = myDir.getFileSystem().newWatchService();
                    myDir.register(watcher, StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE,
                            StandardWatchEventKinds.ENTRY_MODIFY);
                    WatchKey watckKey = watcher.take();
                    List<WatchEvent<?>> events = watckKey.pollEvents();
                    for (WatchEvent event : events) {
                        if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE) {
                            System.out.println("Created: " + event.context().toString());
                        }
                        if (event.kind() == StandardWatchEventKinds.ENTRY_DELETE) {
                            System.out.println("Delete: " + event.context().toString());
                        }
                        if (event.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {
                            System.out.println("Modify: " + event.context().toString());
                        }
                    }

                } catch (Exception e) {
                    System.out.println("Error: " + e.toString());
                }
            }
        }
    }