StandardWatchEventKinds.ENTRY_MODIFY,//更新

StandardWatchEventKinds.ENTRY_DELETE,//创建

StandardWatchEventKinds.ENTRY_CREATE,//删除

import java.io.*;

import java.nio.file.*;

import java.nio.file.attribute.*;

import java.nio.channels.*;

import java.util.ArrayList;

import java.util.LinkedList;

import java.util.List;

public class WatchFile

{

    public static void main(String[] args)

            throws Exception{

        String filePath = ("E:");

        // 获取文件系统的WatchService对象

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

        Paths.get(filePath).register(watchService

                , StandardWatchEventKinds.ENTRY_CREATE

                , StandardWatchEventKinds.ENTRY_MODIFY

                , StandardWatchEventKinds.ENTRY_DELETE);

　　　　// 如要监控子文件

        File file = new File(filePath);

        LinkedList<File> fList = new LinkedList<File>();

        fList.addLast(file);

        while (fList.size() > 0 ) {

            File f = fList.removeFirst();

            if(f.listFiles() == null)

                continue;

            for(File file2 : f.listFiles()){

                    if (file2.isDirectory()){//下一级目录

                    fList.addLast(file2);

                    //依次注册子目录

                    Paths.get(file2.getAbsolutePath()).register(watchService

                            , StandardWatchEventKinds.ENTRY_CREATE

                            , StandardWatchEventKinds.ENTRY_MODIFY

                            , StandardWatchEventKinds.ENTRY_DELETE);

                }

            }

        }

        while(true)

        {

            // 获取下一个文件改动事件

            WatchKey key = watchService.take();

            for (WatchEvent<?> event : key.pollEvents())

            {

                System.out.println(event.context() +" --> " + event.kind());

            }

            // 重设WatchKey

            boolean valid = key.reset();

            // 如果重设失败，退出监听

            if (!valid)

            {

                break;

            }

        }

    }

}