Java利用WatchService监听文件变化示例

package com.longge.mytest;import java.io.IOException;import java.nio.file.FileSystems;import java.nio.file.Path;import java.nio.file.Paths;import java.nio.file.StandardWatchEventKinds;import java.nio.file.WatchEvent;import java.nio.file.WatchKey;import java.nio.file.WatchService;import java.util.List;public class TestWatchService {  public static void main(String[] args) throws IOException {    // 需要监听的文件目录（只能监听目录）    String path = "d:/test";        WatchService watchService = FileSystems.getDefault().newWatchService();    Path p = Paths.get(path);    p.register(watchService, StandardWatchEventKinds.ENTRY_MODIFY,         StandardWatchEventKinds.ENTRY_DELETE,         StandardWatchEventKinds.ENTRY_CREATE);         Thread thread = new Thread(() -> {      try {         while(true){           WatchKey watchKey = watchService.take();           List<WatchEvent<?>> watchEvents = watchKey.pollEvents();           for(WatchEvent<?> event : watchEvents){             //TODO 根据事件类型采取不同的操作。。。。。。。             System.out.println("["+path+"/"+event.context()+"]文件发生了["+event.kind()+"]事件");            }           watchKey.reset();         }       } catch (InterruptedException e) {         e.printStackTrace();       }    });    thread.setDaemon(false);    thread.start();        // 增加jvm关闭的钩子来关闭监听    Runtime.getRuntime().addShutdownHook(new Thread(() -> {      try {        watchService.close();      } catch (Exception e) {      }    }));  }}