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Java 代码之文件监听 

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String path = "";
WatchService service = FileSystems.getDefault().newWatchService();
Path p = Paths.get(path);
p.register(
    service,
    StandardWatchEventKinds.ENTRY_MODIFY,
    StandardWatchEventKinds.ENTRY_DELETE,
    StandardWatchEventKinds.ENTRY_CREATE);

while (true) {
    WatchKey watchKey = service.take();
    List<WatchEvent<?>> watchEvents = watchKey.pollEvents();
    for (WatchEvent<?> event : watchEvents) {
        WatchEvent.Kind<?> eventKind = event.kind();
        System.out.println(
            String.format(
                "文件夹 [%s] 中文件 [%s] 进行了 [%s] 事件, 重复[%s]次.",
                path,
                event.context(),
                eventKind,
                event.count()));
        System.out.println("file=" + event.context().toString());
    }
    watchKey.reset();
    Thread.sleep(10000);
}