在java中如何检测文件系统已经改变 [英] How to detect filesystem has changed in java

问题描述

我想知道如何高效地在java中实现文件系统更改？说我有一个文件夹中的文件，并修改该文件。我想尽快通知java这个变化（如果可能的话，不要频繁轮询）。

因为我想我可以打电话给 java.io.file.lastModified 每隔几秒钟，但我不喜欢这个解决方案的声音。

  alfred @ alfred-laptop：〜/ testje $ java -version 
 java版本1.6.0_18
 Java™SE运行时环境（build 1.6.0_18-b07）
 Java HotSpot™服务器虚拟机（构建16.0-b13，混合模式）
  

解决方案

请看 JNotify ，它执行这种类型的监视。

Java 7将具有一些更高级的API（ $ b $

I would like to know how to efficiently implement filesystem changes in java? Say I got a file in a folder and modify that file. I would like to be notified by java about this change as soon as possible(no frequently polling if possible.).

Because I think I could call java.io.file.lastModified every few seconds but I don't like the sound of that solution at all.

alfred@alfred-laptop:~/testje$ java -version
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Server VM (build 16.0-b13, mixed mode)

解决方案

Take a look at JNotify, which performs this type of monitoring.

Java 7 will have some more advanced APIs (WatchService) for this sort of work which will eliminate polling on the OSes that support this.

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