logback maxhistory含义,logback property

先来一段我们的代码。

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <layout class="ch.qos.logback.classic.PatternLayout"> <pattern>%-15(%d{HH:mm:ss.SSS}) [%t] %-5level %logger{80} [%line] -%msg%n</pattern> </layout> </appender> <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender"> <discriminator> <key>module</key> <defaultValue>module</defaultValue> </discriminator> <sift> <appender name="FILE-${module}" class="ch.qos.logback.core.rolling.RollingFileAppender"> <Encoding>UTF-8</Encoding> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <FileNamePattern>${log.root}/${module}/${module}.%d{yyyy-MM-dd}.log</FileNamePattern> </rollingPolicy> <layout class="ch.qos.logback.classic.PatternLayout"> <pattern>%-15(%d{HH:mm:ss.SSS}) [%t] %-5level %logger{80} [%line] -%msg%n</pattern> </layout> </appender> </sift> </appender> <root level="info"> <appender-ref ref="STDOUT"/> <appender-ref ref="SIFT"/> </root> <logger name="com.shangyu" level="debug" additivity="true"> <appender-ref ref="STDOUT" /><!-- <appender-ref ref="SIFT" />--> </logger>

stdout是打印在控制台。控制台的日志如下：

19:33:04.696 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -==> Preparing: SELECT id,name,age,address,father_name FROM alin_user WHERE id=? 19:33:04.696 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -==> Preparing: SELECT id,name,age,address,father_name FROM alin_user WHERE id=? 19:33:04.729 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -==> Parameters: 1(Integer)19:33:04.729 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -==> Parameters: 1(Integer)19:33:04.759 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -<== Total: 119:33:04.759 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -<== Total: 119:33:04.768 [http-nio-8080-exec-2] INFO com.shangyu.demo.controller.UserController [35] -info19:33:04.768 [http-nio-8080-exec-2] INFO com.shangyu.demo.controller.UserController [35] -info19:33:04.769 [http-nio-8080-exec-2] ERROR com.shangyu.demo.controller.UserController [36] -error19:33:04.769 [http-nio-8080-exec-2] ERROR com.shangyu.demo.controller.UserController [36] -error19:33:04.769 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.controller.UserController [37] -debug19:33:04.769 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.controller.UserController [37] -debug

SIFT是打印日志到文件，粘一些文件中的日志如下：

19:33:04.696 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -==> Preparing: SELECT id,name,age,address,father_name FROM alin_user WHERE id=? 19:33:04.729 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -==> Parameters: 1(Integer)19:33:04.759 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.mapper.UserMapper.selectById [143] -<== Total: 119:33:04.768 [http-nio-8080-exec-2] INFO com.shangyu.demo.controller.UserController [35] -info19:33:04.769 [http-nio-8080-exec-2] ERROR com.shangyu.demo.controller.UserController [36] -error19:33:04.769 [http-nio-8080-exec-2] DEBUG com.shangyu.demo.controller.UserController [37] -debug

可以看出，当additivity设为true时，这个logger标签会继承root，也就不止打印自己的日志，还会打印root的日志，打印两遍。所以一般情况下都会设置成false。