<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<?xml version="1.0" encoding="UTF-8"?>
<!--设置log4j2的自身log级别为warn-->
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--Configuration后面的status,这个用于设置log4j2自身内部的信息输出,可以不设置,
当设置成trace时,你会看到log4j2内部各种详细输出-->
<!--monitorInterval:Log4j能够自动检测修改配置 文件和重新配置本身,设置间隔秒数-->
<Configuration status="TRACE">
<Properties>
<Property name="LOG_ROOT" value="${sys:ljm.log.path:-logs}"></Property>
<Property name="BACKUP_FOLDER">${LOG_ROOT}/bak</Property>
<!-- %-5level 输出日志级别,-5表示左对齐并且固定输出5个字符,如果不足在右边补0-->
<Property name="logFormat">%d{yyyy-MM-dd HH:mm:ss},%L %t %p %C{1.} --->> %9m%n</Property>
<Property name="errFormat">%d{yyyy-MM-dd HH:mm:ss} [%t] %-5level %C - %m%n %ex%n</Property>
</Properties>
<!--先定义所有的appender-->
<Appenders>
<!--这个输出控制台的配置-->
<Console name="Console" target="SYSTEM_OUT">
<!--输出日志的格式-->
<PatternLayout pattern="${logFormat}"/>
</Console>
<!--关键点在于 filePattern后的日期格式,以及TimeBasedTriggeringPolicy的interval,日期格式精确到哪一位,interval也精确到哪一个单位-->
<RollingFile name="errorLog" fileName="${LOG_ROOT}/error.log" immediateFlush = "true">
<FilePattern>${BACKUP_FOLDER}/error.log.%d{yyyy-MM-dd}.gz</FilePattern>
<PatternLayout pattern="${errFormat}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
<RollingFile name="infoLog" fileName="${LOG_ROOT}/info.log" immediateFlush = "true">
<FilePattern>${BACKUP_FOLDER}/info.log.%d{yyyy-MM-dd}.gz</FilePattern>
<PatternLayout pattern="${logFormat}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
<RollingFile name="debugLog" fileName="${LOG_ROOT}/debug.log" >
<FilePattern>${BACKUP_FOLDER}/debug.log.%d{yyyy-MM-dd}.gz</FilePattern>
<PatternLayout pattern="${logFormat}"/>
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
</Appenders>
<Loggers>
<!-- 默认情况下子Logger会继承父Logger的appender,也就是说子Logger会在父Logger的appender里输出,并且日志级别高于info的也会打印出来。-->
<logger name="errorLogger" level="error" additivity="false">
<AppenderRef ref="errorLog"/>
<AppenderRef ref="Console"/>
</logger>
<logger name="infoLogger" level="info" additivity="false">
<AppenderRef ref="infoLog"/>
<AppenderRef ref="Console"/>
</logger>
<logger name="debugLogger" level="debug" additivity="false">
<AppenderRef ref="debugLog"/>
<AppenderRef ref="Console"/>
</logger>
<!-- root相当于logger的父级,Logger会在父Logger的appender里输出-->
<Root level="info">
<AppenderRef ref="respLog"/>
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
Logger errorLog = LogManager.getLogger("errorLogger");
Logger infoLog = LogManager.getLogger("infoLogger");
Logger debugLog = LogManager.getLogger("debugLogger");
errorLog.error("error");
infoLog.info("info");
debugLog.debug("debug");
2020-07-19 11:35:33,19 main ERROR c.l.s.App --->> error
2020-07-19 11:35:33,20 main INFO c.l.s.App --->> info
2020-07-19 11:35:33,21 main DEBUG c.l.s.App --->> debug
,