Full configuration template
<?xml version="1.0" encoding="UTF-8"?>
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--status="WARN" :用于设置log4j2自身内部日志的信息输出级别，默认是OFF-->
<!--monitorInterval="30" :间隔秒数,自动检测配置文件的变更和重新配置本身-->
<configuration status="WARN" monitorInterval="30">
<Properties>
<!--自定义一些常量，之后使用${
变量名}引用-->
<Property name="logFilePath">log</Property>
<Property name="logFileName">test.log</Property>
</Properties>
<!--appenders:定义输出内容,输出格式,输出方式,日志保存策略等,常用其下三种标签[console,File,RollingFile]-->
<appenders>
<!--console :控制台输出的配置-->
<console name="Console" target="SYSTEM_OUT">
<!--PatternLayout :输出日志的格式,LOG4J2定义了输出代码,详见第二部分-->
<PatternLayout pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
</console>
<!--File :同步输出日志到本地文件-->
<!--append="false" :根据其下日志策略,每次清空文件重新输入日志,可用于测试-->
<File name="log" fileName="${logFilePath}/${logFileName}" append="false">
<PatternLayout pattern="%d{HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n"/>
</File>
<!--SMTP :邮件发送日志-->
<SMTP name="Mail" subject="****SaaS系统正式版异常信息" to="[email protected]" from="[email protected]" smtpUsername="[email protected]" smtpPassword="LENG****1234" smtpHost="mail.lengjing.info" smtpDebug="false" smtpPort="25" bufferSize="10">
<PatternLayout pattern="[%-5p]:%d{YYYY-MM-dd HH:mm:ss} [%t] %c{1}:%L - %msg%n" />
</SMTP>
<!-- ${
sys:user.home} :项目路径 -->
<RollingFile name="RollingFileInfo" fileName="${sys:user.home}/logs/info.log"
filePattern="${sys:user.home}/logs/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log">
<!--ThresholdFilter :日志输出过滤-->
<!--level="info" :日志级别,onMatch="ACCEPT" :级别在info之上则接受,onMismatch="DENY" :级别在info之下则拒绝-->
<ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
<!-- Policies :日志滚动策略-->
<Policies>
<!-- TimeBasedTriggeringPolicy :时间滚动策略,默认0点小时产生新的文件,interval="6" : 自定义文件滚动时间间隔,每隔6小时产生新文件, modulate="true" : 产生文件是否以0点偏移时间,即6点,12点,18点,0点-->
<TimeBasedTriggeringPolicy interval="6" modulate="true"/>
<!-- SizeBasedTriggeringPolicy :文件大小滚动策略-->
<SizeBasedTriggeringPolicy size="100 MB"/>
</Policies>
<!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，这里设置了20 -->
<DefaultRolloverStrategy max="20"/>
</RollingFile>
<RollingFile name="RollingFileWarn" fileName="${sys:user.home}/logs/warn.log"
filePattern="${sys:user.home}/logs/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log">
<ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
<Policies>
<TimeBasedTriggeringPolicy/>
<SizeBasedTriggeringPolicy size="100 MB"/>
</Policies>
</RollingFile>
<RollingFile name="RollingFileError" fileName="${sys:user.home}/logs/error.log"
filePattern="${sys:user.home}/logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log">
<ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout pattern="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
<Policies>
<TimeBasedTriggeringPolicy/>
<SizeBasedTriggeringPolicy size="100 MB"/>
</Policies>
</RollingFile>
</appenders>
<!--然后定义logger，只有定义了logger并引入的appender，appender才会生效-->
<loggers>
<!--过滤掉spring和mybatis的一些无用的DEBUG信息-->
<!--Logger节点用来单独指定日志的形式，name为包路径,比如要为org.springframework包下所有日志指定为INFO级别等。 -->
<logger name="org.springframework" level="INFO"></logger>
<logger name="org.mybatis" level="INFO"></logger>
<!-- Root节点用来指定项目的根日志，如果没有单独指定Logger，那么就会默认使用该Root日志输出 -->
<root level="all">
<appender-ref ref="Console"/>
<appender-ref ref="RollingFileInfo"/>
<appender-ref ref="RollingFileWarn"/>
<appender-ref ref="RollingFileError"/>
</root>
<!--AsyncLogger :异步日志,LOG4J有三种日志模式,全异步日志,混合模式,同步日志,性能从高到底,线程越多效率越高,也可以避免日志卡死线程情况发生-->
<!--additivity="false" : additivity设置事件是否在root logger输出，为了避免重复输出，可以在Logger 标签下设置additivity为”false”-->
<AsyncLogger name="AsyncLogger" level="trace" includeLocation="true" additivity="false">
<appender-ref ref="RollingFileError"/>
</AsyncLogger>
</loggers>
</configuration>
Configuration introduction of each part
Appenders: contains the following tags
FileAppender normally outputs to local files;
FlumeAppender collects and concentrates logs from several different sources into one place;
RewriteAppender masks or injects information on log events;
RollingFileAppender seals log files; RoutingAppender
filters and routes between output locations ;
SMTPAppender sends LogEvent to the designated mailing list;
SocketAppender sends LogEvent to remote host in normal format ; SyslogAppender sends LogEvent to remote host
in RFC 5424 format;
AsynchAppender writes a LogEvent asynchronously to multiple different output locations;
ConsoleAppender sends LogEvent Output to the console;
FailoverAppender maintains a queue, the system will try to output LogEvent to Appender in the queue in turn, until one succeeds;
among them, ConsoleAppender, RollingFileAppender and SMTPAppender are more commonly used.
Refer to the official address of log4j
PatternLayout
%m means to output all message
%. 300m means to keep the last 30 characters of the message