log4j.properties value filter

Hi: I am using log4f for the logging in my app,and I want to add a FileAppender to the log,so I have to set the file:

log4j.appender.fileout.File=E:\myapp\logs\log.html

I wonder if there is any way can replace the absolute file path?

Maybe using something like:

log4j.appender.fileout.Fil开发者_高级运维e={something}\logs\log.html?

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Sure it's possible:

log4j.appender.fileout.File=./logs/log.html

Where E:\myapp is your application path.