如何使用WatchService监视子目录中的更改? (Java) [英] How can I watch subdirectory for changes with WatchService? (Java)

问题描述

我想查看一些目录中的更改及其子目录.我尝试使用 WatchService ，但我不知道从哪个目录更改了文件.如何从 ?

I want to watch some directory for changes and her subdirectories. I tried to do this with WatchService but I can't know from which directory the file was changed. How can I retrieve the full path from the WatchEvent?

推荐答案

通常，在启动watchservice时会提供文件的目录名称.这是一个演示其工作原理的教程:

Generally you provide the directory name of the file when starting the watchservice. Here is a tutorial demonstrating how that works:

http://blogs.oracle.com/thejavatutorials/entry/watching_a_directory_for_changes

从教程开始:

   Path dir = ...;
   try {
       WatchKey key = dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);
   }[.....]

当您收到通知时:

   //The filename is the context of the event.
   WatchEvent<Path> ev = (WatchEvent<Path>)event;
   Path filename = ev.context();

   Path child = dir.resolve(filename);

这篇关于如何使用WatchService监视子目录中的更改? (Java)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！