1、先下载logback，可以在官网地址下载：
http://logback.qos.ch/download.html
2、解压后，将logback-access.jar与logback-core.jar复制到$TOMCAT_HOME/lib/目录下
修改$TOMCAT_HOME/conf/server.xml添加：
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<ValveclassName="ch.qos.logback.access.tomcat.LogbackValve"/>
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必须添加在<Engine>或<Host>结点下。
3、logback默认会在$TOMCAT_HOME/conf下查找文件 logback-access.xml
新建 logback-access.xml
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<configuration>
<!-- always a good activate OnConsoleStatusListener -->
<statusListenerclass="ch.qos.logback.core.status.OnConsoleStatusListener"/>
<appendername="FILE"class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>access.log</file>
<rollingPolicyclass="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>access.%d{yyyy-MM-dd}.log.zip</fileNamePattern>
</rollingPolicy>
<encoder>
<pattern>combined</pattern>
</encoder>
</appender>
<appender-refref="FILE"/>
</configuration>
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OK,重启tomcat即可。
来源：oschina
链接：https://my.oschina.net/u/1433107/blog/544561