log4j动态指定log输出路径

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log4j.xml如下：

<?xml version="1.0" encoding="UTF-8" ?> ?

?<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

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<appender name="ALL" value="${loggingRoot}/all.log" />

<param name="MaxFileSize" value="1MB" />

<param name="MaxBackupIndex" value="5" />?

<layout value="${loggingRoot}/xj.log" />

<param name="MaxFileSize" value="1MB" />

<param name="MaxBackupIndex" value="5" />

<layout additivity="false">

<level value="debug" />

<appender-ref ref="appender1" />

</logger>

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<root>

<level value="error" />

<appender-ref ref="ALL" />

</root>

</log4j:configuration> ?

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在启动时添加java_opts项 -DloggingRoot=D:/WebApp/shopping_mvn/output/logs