下面以xml格式的log4j配置文件為例說明
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="
<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<param name="Target" value="System.err"/>
<param name="Threshold" value="ALL"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{HH:mm:ss,SSS}][%p,%c{1}] %m%n"/>
</layout>
</appender>
<appender name="FILE" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="${log4jdir}/log.txt"/>
<param name="Threshold" value="ALL"/>
<param name="MaxFileSize" value="300KB"/>
<param name="MaxBackupIndex" value="20"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{HH:mm:ss,SSS}][%p,%c{1}] %m%n"/>
</layout>
</appender>
<root>
<level value="DEBUG"/>
<appender-ref ref="CONSOLE"/>
<appender-ref ref="FILE"/>
</root>
</log4j:configuration>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
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