java监控文件目录下的变化

本文主要是介绍java监控文件目录下的变化，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1.使用jdk自带的工具

/*** jdk 自带监控文件目录变化* @author love**/
public class WatchServiceTest {public static void main(String[] args) {final Path path = Paths.get("F:/test");try(WatchService watch=FileSystems.getDefault().newWatchService()){path.register(watch,StandardWatchEventKinds.ENTRY_CREATE,StandardWatchEventKinds.ENTRY_DELETE,StandardWatchEventKinds.ENTRY_MODIFY);while(true) {final WatchKey key = watch.take();for(WatchEvent<?> e:key.pollEvents()) {WatchEvent.Kind<?> kind = e.kind();if(kind==StandardWatchEventKinds.OVERFLOW) {continue;}if(kind==StandardWatchEventKinds.ENTRY_CREATE) {System.out.println("create");}if(kind==StandardWatchEventKinds.ENTRY_DELETE) {System.out.println("delete");}if(kind==StandardWatchEventKinds.ENTRY_MODIFY) {System.out.println("modify");}WatchEvent<Path> watchPath = (WatchEvent<Path>)e;Path filename = watchPath.context();System.out.println(kind + "---"+filename);}boolean valid = key.reset();if(!valid) {break;}}}catch(Exception e){e.printStackTrace();}}}

2使用common-io包下的工具

2.下载commons-io 2.x版本

在这里插入代码片
/*** 使用io包监控文件变化* @author love**/
public class DirTest {/*** 测试使用io包* @author love**/private static class FileListener extends FileAlterationListenerAdaptor{@Overridepublic void onFileCreate(File file) {System.out.println("file create....");}@Overridepublic void onFileDelete(File file) {System.out.println("file delete....");}@Overridepublic void onFileChange(File file) {System.out.println("file change...");}@Overridepublic void onDirectoryChange(File directory) {System.out.println("onDirectoryChange");}@Overridepublic void onDirectoryCreate(File directory) {System.out.println("onDirectoryCreate");}@Overridepublic void onDirectoryDelete(File directory) {System.out.println("onDirectoryDelete");}@Overridepublic void onStart(FileAlterationObserver observer) {
//			System.out.println("onStart");super.onStart(observer);}@Overridepublic void onStop(FileAlterationObserver observer) {
//			System.out.println("onStop");super.onStop(observer);}}public static void main(String[] args) {String rootPath = "F:/test";//轮询时间5slong interval = TimeUnit.SECONDS.toMillis(1);//创建过滤器链IOFileFilter directors = FileFilterUtils.and(FileFilterUtils.directoryFileFilter(),HiddenFileFilter.VISIBLE);IOFileFilter files = FileFilterUtils.and(FileFilterUtils.fileFileFilter(),FileFilterUtils.suffixFileFilter(".txt"));IOFileFilter filter = FileFilterUtils.or(directors,files);//使用过滤器链FileAlterationObserver observer = new FileAlterationObserver(new File(rootPath), filter);//不使用过滤器链observer.addListener(new FileListener());
//		FileAlterationObserver observer = new FileAlterationObserver(new File(rootPath));//创建文件变化监视器FileAlterationMonitor monitor = new FileAlterationMonitor(interval, observer);try {monitor.start();} catch (Exception e) {e.printStackTrace();}}}

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