log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="info">
    <appenders>
        <Console name="Console" target="SYSTEM_OUT" follow="true">
            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %t %-5level %logger{30}.%method - %msg%n"/>
        </Console>

        <!--默认按天&按512M文件大小切分日志，默认最多保留30个日志文件，非阻塞模式-->
        <XMDFile name="infoAppender" fileName="info.log" sizeBasedTriggeringSize="512M"
                 rolloverMax="30">
            <Filters>
                <ThresholdFilter level="warn" onMatch="DENY" onMismatch="NEUTRAL"/>
                <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </XMDFile>

        <XMDFile name="warnAppender" fileName="warn.log" sizeBasedTriggeringSize="512M"
                 rolloverMax="30">
            <Filters>
                <ThresholdFilter level="error" onMatch="DENY" onMismatch="NEUTRAL"/>
                <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </XMDFile>

        <XMDFile name="errorAppender" fileName="error.log" sizeBasedTriggeringSize="512M"
                 rolloverMax="30">
            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
        </XMDFile>

        <!--日志远程上报-->
        <Scribe name="ScribeAppender">
            <!--远程日志默认使用appkey作为日志名(app.properties文件中的app.name字段)，也可自定义scribeCategory属性，scribeCategory优先级高于appkey-->
            <LcLayout/>
        </Scribe>
        <Async name="ScribeAsyncAppender" blocking="false">
            <AppenderRef ref="ScribeAppender"/>
        </Async>

        <!--hive日志远程上报-->
        <Scribe name="ScribeHiveAppender">
            <!--远程日志默认使用appkey作为日志名(app.properties文件中的app.name字段)，也可自定义scribeCategory属性，scribeCategory优先级高于appkey-->
            <Property name="scribeCategory">qcs.regulation.jiaotongbu</Property>
            <LcLayout/>
        </Scribe>
        <Async name="XMDFileAppender" blocking="false">
            <AppenderRef ref="ScribeHiveAppender"/>
        </Async>

        <CatAppender name="catAppender"/>

    </appenders>

    <loggers>
        <logger name="hive-logger" additivity="false">
            <AppenderRef ref="XMDFileAppender"/>
            <appender-ref ref="ScribeAsyncAppender"/>
        </logger>

        <logger name="com.sankuai.qcs.regulation" additivity="false">
            <appender-ref ref="ScribeAsyncAppender"/>
            <appender-ref ref="infoAppender"/>
            <appender-ref ref="warnAppender"/>
            <appender-ref ref="errorAppender"/>
            <appender-ref ref="catAppender"/>
        </logger>

        <!--其他日志-->
        <root level="info">
            <appender-ref ref="warnAppender"/>
            <appender-ref ref="errorAppender"/>
            <appender-ref ref="Console"/>
            <appender-ref ref="catAppender"/>
        </root>
    </loggers>
</configuration>

其中 最后的：

<root level="info">
            <appender-ref ref="warnAppender"/>
            <appender-ref ref="errorAppender"/>
            <appender-ref ref="Console"/>
            <appender-ref ref="catAppender"/>
        </root>
指的是<!-- 设置根日志级别,指定路径中的日志优先级大于根日志优先级
如果设置了level=info 就是说 根目录会打印info以上的信息；
参考：Log4J日志信息配置文件详解