Java如何检测文件更改 [英] Java how to detect file changes

问题描述

是否有一种方法可以触发每次文件更改都会执行某些操作的事件？
我的意思是这样（用伪代码）

Is there a way to somehow trigger an event that will do something every time a file change? I mean something like that (in pseudo code)

if(DetectedFileModified(pathToFile)){ do stuff }

我知道我可以定期执行此操作，但是我可以不用计时器吗？
我希望能够在用户更新txt文件时执行一些操作（不是通过代码，而是通过打开文件并在其中写入内容），而我不知道他什么时候会做。 / p>

I know I can do it periodically but can I somehow do it without a timer? I want to be able to make some actions when a user is updating a txt file (not via code, but just by opening the file and writing inside) and I don't know when he'll do it.

推荐答案

您需要 WatchService

WatchService API的级别很低，允许您对其进行自定义。您可以按原样使用它，也可以选择在此机制之上创建一个高级API，使其适合您的特定需求。

The WatchService API is fairly low level, allowing you to customize it. You can use it as is, or you can choose to create a high-level API on top of this mechanism so that it is suited to your particular needs.

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