log4j.properties，log4j.xml配置文件的配置示例

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=d:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=info, stdout, file

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="appender1" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="${catalina.home}/logs/mylog1.log" />
<param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%t - %F:%L] %m%n" />
</layout>
</appender>

<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %t %5p [%c:%M:%L] - %m%n"/>
        </layout>
    </appender>
<appender name="appender2" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="${catalina.home}/logs/mylog2.log" />
<param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%t - %F:%L] %m%n" />
</layout>
</appender>

<logger name="fly.sun.service.demo" additivity="false">
<level value="ERROR" />
<appender-ref ref="appender1" />
</logger>
<logger name="fly.sun.dao" additivity="false">
<level value="ERROR" />
<appender-ref ref="appender1"/>
</logger>
<root>
<level value="ERROR" />
<appender-ref ref="appender2" />
</root>
</log4j:configuration>