如何定义在log4j中保存日志文件的路径

Question

I created a simple java web application with tomcat as a server. I want to log all the error messages. I am using log4j.

In log4j.properties I stated

log4j.appender.file.File=C:\\messages.log 

I might be moving my war file to linux / mac. So I want to store it in my project/logs folder. how can I set that path ?

Answer 1

您可以使用tomcat系统变量，例如将所有日志存储在tomcat日志文件夹中：

log4j.appender.serverlog.File=${catalina.base}/logs/my-application.log

Answer 2

You can use java system properties for this.

log4j.appender.file.File=${user.home}/project.log

If you want a specific folder, you can set a property to use.

JAVA_OPTS='$JAVA_OPTS -Dmy_log_folder="/var/myapp/log';
catalina start

And in your log4j.properties

log4j.appender.file.File=${my_log_folder}/project.log