Java tutorial
import java.nio.file.FileSystem; 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; public class Main { public static void main(String[] args) throws Exception { FileSystem fileSystem = FileSystems.getDefault(); WatchService watchService = fileSystem.newWatchService(); Path directory = Paths.get("c:/"); WatchEvent.Kind<?>[] events = { StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE, StandardWatchEventKinds.ENTRY_MODIFY }; directory.register(watchService, events); while (true) { System.out.println("Waiting for a watch event"); WatchKey watchKey = watchService.take(); System.out.println("Path being watched: " + watchKey.watchable()); System.out.println(); if (watchKey.isValid()) { for (WatchEvent<?> event : watchKey.pollEvents()) { System.out.println("Kind: " + event.kind()); System.out.println("Context: " + event.context()); System.out.println("Count: " + event.count()); System.out.println(); } boolean valid = watchKey.reset(); if (!valid) { // The watchKey is not longer registered } } } } }