在Java中最有效的方式来查看/轮询日志文件 [英] Most efficient way to tail/poll a log file in Java

问题描述

有许多方法可以使用创建一个程序，只需调用Unix tail 命令，但是问题是这个进程必须安装在Unix机器尾部安装。另一个选择是只读取文件，一行一行，直到没有更多的行，睡一段时间，然后尝试读取下一行和重复。

现在的问题是如何去查询正在被写入的文件。 AFAIK没有办法在Java中获取异步通知，当文件被修改，因为这是太低级别（来自操作系统）。我也知道没有支持这个的库。

<如果你可以使用Java 7，那么有File Watcher，你可以实现你所需要的东西。

解决方案 >
文件通知

对于Java 6（以及之前的版本），您将不得不使用Apache Commons VFS（ File Monitor） lib来创建你自己的文件监视器。如果你不能去Java 7或使用第三方库（例如commons或 jnotify ）你将不得不使用轮询线程写一个文件看门狗你的自我。

There are many approaches, one could use create a Program and just call the Unix tail command, however the problem with this is that the process must be installed on a Unix machine with tail installed.

The other option is to just read the file, line by line until there are no more lines, sleep for a period of time and then try to read the next line and repeat.

The question is what/how do I go about polling a file which is actively being written to. AFAIK there is no way in Java to get async notifications when a file has been modified as this is too low level (something that comes from the OS). I am also aware of no libs which support this.

I was thinking a better approach may be to sleep/poll on the modified date of a file..?

Any solutions?

解决方案

If you can use Java 7 there are File Watchers and you could implement what you need.
File Notifications

For Java 6 (and previous) you would have to use Apache Commons VFS (File Monitor) lib to create your own file watcher.

If you can't go to Java 7 or use third party libs (e.g commons or jnotify) you would have to write a file watchdog your self using polling threads.

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