據網上博客整理，再加上自己一些理解。
參考：
https://www.cnblogs.com/sa-dan/p/6837225.html
https://www.jianshu.com/p/d13c2e50a89c
<?xml version="1.0" encoding="UTF-8"?>
<!--日志級別以及優先級排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--status="WARN" :用於設置log4j2自身內部日志的信息輸出級別，默認是OFF-->
<!--monitorInterval="30" :間隔秒數,自動檢測配置文件的變更和重新配置本身-->
<configuration status="warn" monitorInterval="60" strict="true">
<properties>
<!--自定義一些常量，之后使用${變量名}引用-->
<property name="logpath">./logs</property>
<property name="charset">UTF-8</property>
<!--自定義的輸出格式-->
<property name="pattern">%-d{yyyy-MM-dd HH:mm:ss.SSS}@@%p@@%X{ip}@@%t %C@@%X{requestId} %M %m %n </property>
</properties>
<!--appenders:定義輸出內容,輸出格式,輸出方式,日志保存策略等,常用其下三種標簽[console,File,RollingFile]-->
<!--Appender可以理解為日志的輸出目的地-->
<appenders>
<!--console :控制台輸出的配置-->
<Console name="console" target="SYSTEM_OUT">
<PatternLayout pattern="${pattern}" charset="${charset}"/>
</Console>
<!--RollingRandomAccessFile性能比RollingFile提升官網宣稱是20-200%-->
<RollingRandomAccessFile name="YZY.TRACE" immediateFlush="true" bufferSize="1024"
fileName="${logpath}/trace.log"
filePattern="${logpath}/trace.log.%d{yyyy-MM-dd}.gz">
<PatternLayout pattern="${pattern}" charset="${charset}"/>
<TimeBasedTriggeringPolicy/>
<DefaultRolloverStrategy>
<Delete basePath="${logpath}" maxDepth="2" followLinks="true">
<IfFileName glob="trace.log.*.gz"/>
<IfLastModified age="3d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingRandomAccessFile>
<RollingRandomAccessFile name="YZY.SYSTEM" immediateFlush="true" bufferSize="4096"
fileName="${logpath}/system.log"
filePattern="${logpath}/system.log.%d{yyyy-MM-dd}.gz"
ignoreExceptions="false">
<!--引用上面自定義的輸出格式-->
<PatternLayout pattern="${pattern}" charset="${charset}"/>
<Filters>
<!--ThresholdFilter :日志輸出過濾-->
<!--level="info" :日志級別,onMatch="ACCEPT" :級別在info之上則接受,onMismatch="DENY" :級別在info之下則拒絕-->
<!--與logger、root中定義的日志級別相配合，相當於兩個閘門，先判斷logger、root的級別，符合了才會用到該filter中的level，此時再進行一次篩選-->
<ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
<!--<ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY"/>-->
<!--<ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>-->
</Filters>
<!-- Policies :日志滾動策略-->
<Policies>
<!--<TimeBasedTriggeringPolicy interval="1" modulate="true"/>-->
<CronTriggeringPolicy schedule="0 0 2 * * ?" evaluateOnStartup="true"/>
</Policies>
<!-- DefaultRolloverStrategy屬性如不設置，則默認為最多同一文件夾下7個文件-->
<DefaultRolloverStrategy>
<Delete basePath="${logpath}" maxDepth="2" followLinks="true">
<IfFileName glob="system.log.*.gz"/>
<!--只保留7天，超過則刪除-->
<IfLastModified age="7d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingRandomAccessFile>
<RollingRandomAccessFile name="YZY.ERROR" immediateFlush="true" bufferSize="4096"
fileName="${logpath}/error.log"
filePattern="${logpath}/error.log.%d{yyyy-MM-dd}.gz"
ignoreExceptions="false">
<PatternLayout pattern="${pattern}" charset="${charset}"/>
<Filters>
<ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/>
</Filters>
<TimeBasedTriggeringPolicy/>
<DefaultRolloverStrategy>
<Delete basePath="${logpath}" maxDepth="2" followLinks="true">
<IfFileName glob="error.log.*.gz"/>
<IfLastModified age="7d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingRandomAccessFile>
<RollingRandomAccessFile name="YZY.AUDIT" immediateFlush="false" bufferSize="8192"
fileName="${logpath}/audit.log"
filePattern="${logpath}/audit.log.%d{yyyy-MM-dd}.gz"
ignoreExceptions="false">
<PatternLayout pattern="${pattern}" charset="${charset}"/>
<Filters>
<ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/>
</Filters>
<TimeBasedTriggeringPolicy/>
<DefaultRolloverStrategy>
<Delete basePath="${logpath}" maxDepth="2" followLinks="true">
<IfFileName glob="audit.log.*.gz"/>
<IfLastModified age="7d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingRandomAccessFile>
<RollingRandomAccessFile name="YZY.POOL" immediateFlush="true" bufferSize="1024"
fileName="${logpath}/pool.log"
filePattern="${logpath}/pool.log.%d{yyyy-MM-dd}.gz"
ignoreExceptions="false">
<PatternLayout pattern="${pattern}" charset="${charset}"/>
<TimeBasedTriggeringPolicy/>
<DefaultRolloverStrategy>
<Delete basePath="${logpath}" maxDepth="2" followLinks="true">
<IfFileName glob="pool.log.*.gz"/>
<IfLastModified age="3d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingRandomAccessFile>
<RollingRandomAccessFile name="YZY.MONITOR" immediateFlush="true" bufferSize="1024"
fileName="${logpath}/monitor.log"
filePattern="${logpath}/pool.log.%d{yyyy-MM-dd}.gz"
ignoreExceptions="false">
<PatternLayout pattern="${pattern}" charset="${charset}"/>
<TimeBasedTriggeringPolicy/>
<DefaultRolloverStrategy>
<Delete basePath="${logpath}" maxDepth="2" followLinks="true">
<IfFileName glob="pool.log.*.gz"/>
<IfLastModified age="3d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingRandomAccessFile>
<RollingRandomAccessFile name="YZY.BIZ" immediateFlush="true"
fileName="${logpath}/biz.log"
filePattern="${logpath}/biz.log.%d{yyyy-MM-dd}.gz"
ignoreExceptions="false">
<PatternLayout pattern="${pattern}" charset="${charset}"/>
<TimeBasedTriggeringPolicy/>
<DefaultRolloverStrategy>
<Delete basePath="${logpath}" maxDepth="2" followLinks="true">
<IfFileName glob="biz.log.*.gz"/>
<IfLastModified age="7d"/>
</Delete>
</DefaultRolloverStrategy>
</RollingRandomAccessFile>
</appenders>
<!--然后定義logger，只有定義了logger並引入的appender，appender才會生效-->
<loggers>
<!--additivity="false"表示在該logger中輸出的日志不會再延伸到父層logger。這里如果改為true，則會延伸到Root Logger，遵循Root Logger的配置也輸出一次。-->
<Logger additivity="false" name="YZY.TRACE" level="INFO">
<AppenderRef ref="YZY.TRACE"/>
</Logger>
<Logger additivity="false" name="YZY.SYSTEM" level="INFO">
<AppenderRef ref="YZY.SYSTEM"/>
<AppenderRef ref="YZY.ERROR"/>
</Logger>
<Logger additivity="false" name="YZY.BIZ" level="INFO">
<AppenderRef ref="YZY.BIZ"/>
</Logger>
<!--Logger節點用來單獨指定日志的形式，name為包路徑,比如要為org.apache包下所有日志指定為INFO級別等。 -->
<Logger additivity="false" name="org.apache" level="INFO">
<AppenderRef ref="console"/>
</Logger>
<Logger additivity="false"
name="com.alibaba.dubbo.common.threadpool.monitor.MonitorPoolRunnable" level="INFO">
<AppenderRef ref="YZY.POOL"/>
</Logger>
<Logger additivity="false" name="com.alibaba.dubbo.monitor.dubbo.sfextend.SfMonitorExtend"
level="INFO">
<AppenderRef ref="YZY.MONITOR"/>
</Logger>
<!--針對,request以及reponse的信息配置輸出級別,生產線請配置為error-->
<Logger additivity="true" name="com.alibaba.dubbo.rpc.protocol.rest.support" level="INFO">
<AppenderRef ref="console"/>
</Logger>
<!-- 在開發和測試環境啟用,輸出sql -->
<Logger additivity="true" name="com.YZY.mapper" level="DEBUG">
</Logger>
<!-- Root節點用來指定項目的根日志，如果沒有單獨指定Logger，那么就會默認使用該Root日志輸出 -->
<Root level="DEBUG" includeLocation="true">
<AppenderRef ref="console"/>
<AppenderRef ref="YZY.SYSTEM"/>
<AppenderRef ref="YZY.ERROR"/>
<AppenderRef ref="YZY.AUDIT"/>
</Root>
</loggers>
</configuration>
public class TestLog {
public static void main(String[] args) {
Logger logger = LoggerFactory.getLogger("YZY.SYSTEM");
//Logger logger = LoggerFactory.getLogger(TestLog.class);
logger.trace("trace level");
logger.debug("debug level");
logger.info("info level");
logger.warn("warn level");
logger.error("error level");
}
}
RollingRandomAccessFile性能比RollingFile提高很多。
另https://www.cnblogs.com/sa-dan/p/6837225.html解釋了
即可以在程序中使用Logger logger = LoggerFactory.getLogger("YZY.SYSTEM");來獲取對應的logger，如果找到對應名稱的logger，就不會使用root節點的logger。
LoggerFactory.getLogger(TestLog.class)底層實現也是調用的getLogger(clazz.getName());
如上代碼，LoggerFactory.getLogger(TestLog.class)找不到對應的logger，會使用默認的root節點的配置。