log4j 通过文件传入配置

The solution is using of the following JVM argument:

-Dlog4j.configuration={path tofile}

If the file is NOT in the classpath (in WEB-INF/classes in case of Tomcat) but somewhere on you disk, use file:, like、

-Dlog4j.configuration=file:C:Usersmelog4j.xml

More information and examples here: http://logging.apache.org/log4j/1.2/manual.html

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