Get新技能,Java实现文件监控
【摘要】
作者: 八阿哥的剑
博客: https://springlearn.cn
一日一句毒鸡汤
问世间钱为何物，只叫人生死相许。！😄
# Java原生版本监控
public class JavaWatchAPI { public static void main(String[] args)...
作者: 八阿哥的剑
博客: https://springlearn.cn
一日一句毒鸡汤
问世间钱为何物，只叫人生死相许。！😄
# Java原生版本监控
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public class JavaWatchAPI {
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public static void main(String[] args) throws Exception {
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//第一步：取得WatchService
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WatchService watchService = FileSystems.getDefault().newWatchService();
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//第二步：确定要监控的路径
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Path path = Paths.get("/Users/liuxin/Github/nobug-learn-project/nobug-learn-01/src/main/java");
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//第三步：为本路径绑定WatchService，并确定监控的事件
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path.register(
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watchService,
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// StandardWatchEventKinds.ENTRY_CREATE—当有新文件时触发。可能是创建了一个新文件
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StandardWatchEventKinds.ENTRY_CREATE,
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// StandardWatchEventKinds.ENTRY_DELETE—当文件被删除、移动或重命名时触发
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StandardWatchEventKinds.ENTRY_DELETE,
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// StandardWatchEventKinds.ENTRY_MODIFY—当文件被修改时触发。
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StandardWatchEventKinds.ENTRY_MODIFY);
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// StandardWatchEventKinds.OVERFLOW—触发表示丢失或丢弃的事件。
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WatchKey key = null;
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while ((key = watchService.take()) != null) {
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for (WatchEvent<?> event : key.pollEvents()) {
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System.out.println("事件" + event.kind() + "发生了，文件是：" + event.context());
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}
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key.reset();
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}
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}
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}
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# Common IO 工具包监控
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package cn.github.chinesszz;
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import org.apache.commons.io.filefilter.FileFilterUtils;
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import org.apache.commons.io.monitor.FileAlterationListener;
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import org.apache.commons.io.monitor.FileAlterationMonitor;
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import org.apache.commons.io.monitor.FileAlterationObserver;
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import org.junit.Test;
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import java.io.File;
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import java.util.concurrent.TimeUnit;
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/**
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* @author liuxin
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* 2021/11/9 8:55 下午
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*/
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public class CommonIOAPI {
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public static void main(String[] args) throws Exception {
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File directory = new File("/Users/liuxin/Github/nobug-learn-project/nobug-learn-01/src/main/java");
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// 轮询间隔 5 秒
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long interval = TimeUnit.SECONDS.toMillis(5);
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// 创建一个文件观察器用于处理文件的格式
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FileAlterationObserver observer = new FileAlterationObserver(directory, FileFilterUtils.and(
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FileFilterUtils.fileFileFilter(), FileFilterUtils.suffixFileFilter(".txt"),
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FileFilterUtils.prefixFileFilter("lx")));
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// 设置文件变化监听器
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observer.addListener(new MyFileListener());
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FileAlterationMonitor monitor = new FileAlterationMonitor(interval, observer);
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monitor.start();
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System.out.println(1);
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}
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@Test
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public void watchDir() throws Exception {
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File directory = new File("/Users/liuxin/Github/nobug-learn-project/nobug-learn-01/src/main/java");
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FileAlterationObserver fileAlterationObserver = new FileAlterationObserver(directory, FileFilterUtils.and(
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FileFilterUtils.directoryFileFilter()));
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long interval = TimeUnit.SECONDS.toMillis(5);
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// 设置文件变化监听器
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fileAlterationObserver.addListener(new MyFileListener());
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FileAlterationMonitor monitor = new FileAlterationMonitor(interval, fileAlterationObserver);
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monitor.start();
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while (true);
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}
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static final class MyFileListener implements FileAlterationListener {
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@Override
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public void onStart(FileAlterationObserver fileAlterationObserver) {
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System.out.println("monitor start scan files..");
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}
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@Override
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public void onDirectoryCreate(File file) {
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System.out.println(file.getName() + " director created.");
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}
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@Override
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public void onDirectoryChange(File file) {
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System.out.println(file.getName() + " director changed.");
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}
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@Override
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public void onDirectoryDelete(File file) {
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System.out.println(file.getName() + " director deleted.");
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}
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@Override
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public void onFileCreate(File file) {
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System.out.println(file.getName() + " created.");
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}
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@Override
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public void onFileChange(File file) {
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System.out.println(file.getName() + " changed.");
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}
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@Override
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public void onFileDelete(File file) {
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System.out.println(file.getName() + " deleted.");
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}
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@Override
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public void onStop(FileAlterationObserver fileAlterationObserver) {
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System.out.println("monitor stop scanning..");
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}
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}
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}
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文章来源: springlearn.blog.csdn.net，作者：西魏陶渊明，版权归原作者所有，如需转载，请联系作者。
原文链接：springlearn.blog.csdn.net/article/details/125858042
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