Java检测文件系统中的更改 [英] Java detect changes in filesystem

问题描述

我有一个文件夹，在这个文件夹中连续不断地转储新文件。在Java中，检测文件系统（即文件被转储的指定文件夹）更改的最佳方法是什么？文件到一个队列数据结构，以便我可以顺序处理每个传入的文件。

我知道File类中的listFiles（）函数，但是使用这个我只能获取即时可用的文件。当然，我可以连续轮询文件夹，并使用线程获取文件列表。但这是最好的方法，或者有更好的方法来完成这个。

解决方案

不断轮询是Java中的一种方式 - 尽管不要频繁轮询，如果目录中包含大量条目，那么操作可能相当繁重。 p>

JDK 7将具有特定的API来执行此操作 java.nio.file.WatchFile

I have a folder in which continuously new files are being dumped.In Java,what is the best way to detect changes in file-system (ie. a specified folder in which the files are being dumped) and add the newly arrived files to a queue data structure so that i can sequentially process each incoming file.

I'm aware of listFiles() function in the File class but using this I can only get files that are available at an instant of time. Of course I can continuously poll the folder and get the list of files in it using a thread.But is this the best way or is there a better way to accomplish this.

解决方案

Continuously polling is the way to do it in Java as of now - though don't poll too often, it can be quite a heavy operation if the directory contains lots of entries.

JDK 7 will have a specific API for doing just this java.nio.file.WatchFile

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