通过java7提供的WatchService API 实现对文件夹的监控
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package service;import config.Config;import java.io.IOException;import java.nio.file.*;import java.util.List;import java.util.concurrent.TimeUnit;public class WatchDirService { private WatchService watchService; private boolean notDone = true; public WatchDirService(String dirPath){ init(dirPath); } private void init(String dirPath) { Path path = Paths.get(dirPath); try { watchService = FileSystems.getDefault().newWatchService(); //创建watchService path.register(watchService, StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_MODIFY, StandardWatchEventKinds.ENTRY_DELETE); //注册需要监控的事件,ENTRY_CREATE 文件创建,ENTRY_MODIFY 文件修改,ENTRY_MODIFY 文件删除 } catch (IOException e) { e.printStackTrace(); } } public void start(){ System.out.print("watch..."); while (notDone){ try { WatchKey watchKey = watchService.poll(Config.POLL_TIME_OUT, TimeUnit.SECONDS); //此处将处于等待状态,等待检测到文件夹下得文件发生改变,返回WatchKey对象 if(watchKey != null){ List<WatchEvent<?>> events = watchKey.pollEvents(); //获取所有得事件 for (WatchEvent event : events){ WatchEvent.Kind<?> kind = event.kind(); if (kind == StandardWatchEventKinds.OVERFLOW){ //当前磁盘不可用 continue; } WatchEvent<Path> ev = event; Path path = ev.context(); if(kind == StandardWatchEventKinds.ENTRY_CREATE){ System.out.println("create " + path.getFileName()); }else if(kind == StandardWatchEventKinds.ENTRY_MODIFY){ System.out.println("modify " + path.getFileName()); }else if(kind == StandardWatchEventKinds.ENTRY_DELETE){ System.out.println("delete " + path.getFileName()); } } if(!watchKey.reset()){ //已经关闭了进程 System.out.println("exit watch server"); break; } } } catch (InterruptedException e) { e.printStackTrace(); return; } } }} |
就是这么简单就可以对一个文件夹进行监控了。
完整带码地址:WatchServerDemo.rar
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.jianshu.com/p/928ce1010407
