用于监视文本文件中的更改的 Java 代码
我需要编写一个java代码来检测对文本文件所做的更改，并在文本文件更改时通知对文本文件所做的更改，即）如果文本文件中的单词ABCD更改为BCDA，那么我需要请注意，ABCD 更改为 BCDA。你能让我知道我是否可以使用java实现这一点（仅使用开源工具，不使用付费或商业工具）
I need to write a java code which detects changes done to a text file and also notify what change was done to the text file when the text file is changed ie) If a word ABCD was changed to BCDA in the text file then i need to be notified that ABCD was changed to BCDA. Can you please let me know whether i can achieve this using java(using only opensource and no paid or commercial tools)
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请参阅 http: //commons.apache.org/io/api-release/index.html?org/apache/commons/io/monitor/package-summary.html 一个可以让你监视文件的开源库进行更改。
编辑：请注意，这将报告发生了更改，但不报告更改的特定行。如果您希望实时进行比较，您可能必须自己运行比较：我不确定是否存在任何预先打包的代码可以为您进行比较。
See http://commons.apache.org/io/api-release/index.html?org/apache/commons/io/monitor/package-summary.html for an open-source library that will let you watch a file for changes.
EDIT: Note that this will report that a change occured, but not the specific line that changed. If you want a diff to occur in real time you'll probably have to run the diff yourself: I'm uncertain any prepackaged code exists that will do the diff for you.
如需更标准的解决方案，您还可以查看JSR 203 backport for Java 6。它提供文件扫描器功能，与即将推出的 Java 运行时兼容。
For a more standard solution, you can also take a look at JSR 203 backport for Java 6. it provides File Scanner facility, compatible with upcoming Java runtime.
听起来你想运行实时差异。
跟踪文件的“旧”版本。然后编写一段每 5 分钟运行一次或根据您需要的细粒度运行的代码。使用您自己的方法或库方法在这两个文件之间运行差异（请参阅 java- diff-utils）。
Sounds like you want to run a real-time diff.
Keep track of the "old" version of the file. Then have a piece of code that runs every 5 minutes or however fine-grained you need. Run a diff between these two files using either your own method or a library method (see java-diff-utils).