Java 监测目录

今天看书看到Java监测目录的一段代码，测试了一下，在此记录：

public static void FolderWatcher(String filePath){Path path = Paths.get(filePath);// To check file exist.if (!path.toFile().exists())throw new IllegalArgumentException("The file path is not exist.");try{WatchService watcher = FileSystems.getDefault().newWatchService();WatchKey key = path.register(watcher, StandardWatchEventKinds.ENTRY_MODIFY,StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE);while (true){key = watcher.take();for (WatchEvent<?> event : key.pollEvents()){System.out.println(event.context() + "  " + event.kind());}key.reset();}} catch (IOException | InterruptedException e){e.printStackTrace();}}

代码中StandardWatchEventKinds类参数可以根据选择添加。