Log4j2在项目中的应用

maven配置文件

<dependency>            <groupId>org.apache.commons</groupId>            <artifactId>commons-lang3</artifactId>            <version>3.5</version>        </dependency>        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-core</artifactId>            <version>2.8</version>        </dependency>        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-api</artifactId>            <version>2.8</version>        </dependency>

xml配置文件

<?xml version="1.0" encoding="UTF-8"?><configuration status="info">    <appenders>        <!--这个输出控制台的配置 -->        <Console name="Console" target="SYSTEM_OUT">            <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch） -->            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY" />            <!--日志的格式 -->            <PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%t:%r][%-5level] %l - %msg%xEx%n" />        </Console>        <!--这个会打印出所有的信息，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档 -->        <RollingFile name="RollingFile" fileName="./logs/info_otr.log" filePattern="logs/$${date:yyyy-MM}/info_otr-%d{yyyy-MM-dd}-%i.log.gz">            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY" />            <PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%t:%r][%-5level] %l - %msg%xEx%n" />            <SizeBasedTriggeringPolicy size="50MB" />        </RollingFile>        <RollingFile name="RollingFileError" fileName="./logs/error_otr.log" filePattern="logs/$${date:yyyy-MM}/error_otr-%d{yyyy-MM-dd}-%i.log.gz">            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY" />            <PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%t:%r][%-5level] %l - %msg%xEx%n" />            <SizeBasedTriggeringPolicy size="50MB" />        </RollingFile>        <!-- <File name="ERROR" fileName="./logs/error.log">            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY" />            <PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%t:%r][%-5level] %l - %msg%xEx%n" />        </File> -->    </appenders>    <!--然后定义logger，只有定义了logger并引入的appender，appender才会生效 -->    <loggers>        <logger name="org.springframework" level="debug" additivity="false">            <appender-ref ref="Console" />        </logger>        <logger name="net.sf.jmimemagic" level="error" additivity="false">            <appender-ref ref="Console" />        </logger>        <logger name="org.mongodb.driver" level="error" additivity="false">            <appender-ref ref="Console" />        </logger>        <logger name="org.apache.commons.beanutils" level="error" additivity="false">            <appender-ref ref="Console" />        </logger>        <logger name="org.apache.zookeeper" level="error" additivity="false">            <appender-ref ref="Console" />        </logger>        <!--建立一个默认的root的logger -->        <root level="info">            <appender-ref ref="RollingFile" />            <appender-ref ref="RollingFileError" />            <appender-ref ref="Console" />        </root>    </loggers></configuration>