使用 log4j 在 Java 中记录一个线程
我有一个用 Java 编写的 Web 应用程序，并且有一个线程池。
应用程序很大，我无法进行重大更改，例如无法更改log4j。
我正在线程池中执行批处理进程，并且我想记录执行该进程所执行的所有内容。
线程池中始终只有一个线程处于活动状态。
我该怎么做有什么想法吗？
I have an web application written in Java, and I have a thread-pool.
The application is huge, and I cannot make major changes, for example, I cannot change log4j.
I am executing a batch process in the thread pool, and I want to log everything that goes is executed to execute that process.
There will always be just one thread active in the thread pool.
Any ideas of how can I do that?
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我想您还有其他线程，例如您不想记录的请求线程，并且您只想将批处理中的事件记录到专用日志文件中。
要将所有日志批量写入日志文件，您需要在运行时对 log4j 配置进行一些运行时调整。您可以在批处理开始时添加这些更改，并在批处理完成时删除这些更改 - 静态 log4j 应用程序配置不会更改，并且运行时 log4j 配置更改不会影响应用程序的其余部分。
以下是您为仅为批次启用日志记录而进行的更改：
I imagine you have other threads, such as request threads that you don't want to log, and that you want to log just events from the batch to a dedicated logfile.
To write out all logs by the batch to a logfile, you will need to make some runtime tweaks to the log4j config at runtime. You add these changes at the start of the batch, and remove the changes when the batch is complete - the static log4j application config doesn't change, and the runtime log4j config change will not affect the rest of the app.
These are the changes you make to enable logging for just the batch:
我假设所有内容都在您提到的单个线程上执行，并且我所说的所有内容是指您感兴趣的所有内容。
如果您可以更改 log4j 配置文件以在日志格式字符串中包含线程 ID，那么您可以使用一个工具（例如 grep）将日志过滤到该线程。
I am assuming that everything is executed on the single thread you mention, and by everything I mean everything you are interested in.
If you can change the log4j config file to include thread ids in the log format string, then you can use a tool (e.g. grep) to filter the log to just that thread.