如果想要在SpringBoot中使用Log4j2，首先需要排除原本默认的日志依赖，然后再将log4j2的依赖添加进来。具体配置如下:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--引用log4j2依赖包-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
自定义log4j2的配置文件（放在类路径下）取名可以是log4j2.xml或者log4j2-spring.xml（SpringBoot建议），具体配置文件例子如下： 这边我借鉴了默认提供的配置，并且修改了日志输出文件的路径，你可以自己修改FILE_PATH的值更新路径
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
<Properties>
<Property name="PID">????</Property>
<Property name="LOG_EXCEPTION_CONVERSION_WORD">%xwEx</Property>
<Property name="LOG_LEVEL_PATTERN">%5p</Property>
<Property name="LOG_DATEFORMAT_PATTERN">yyyy-MM-dd HH:mm:ss</Property>
<Property name="CONSOLE_LOG_PATTERN">%clr{%d{${LOG_DATEFORMAT_PATTERN}}}{faint} %clr{${LOG_LEVEL_PATTERN}} %clr{${sys:PID}}{magenta} %clr{---}{faint} %clr{[%15.15t]}{faint} %clr{%-40.40c{1.}}{cyan} %clr{:}{faint} %m%n${sys:LOG_EXCEPTION_CONVERSION_WORD}</Property>
<Property name="FILE_LOG_PATTERN">%d{${LOG_DATEFORMAT_PATTERN}} ${LOG_LEVEL_PATTERN} ${sys:PID} --- [%t] %-40.40c{1.} : %m%n${sys:LOG_EXCEPTION_CONVERSION_WORD}</Property>
<Property name="FILE_PATH">D:/springboot.log</Property>
</Properties>
<Appenders>
<Console name="Console" target="SYSTEM_OUT" follow="true">
<PatternLayout pattern="${sys:CONSOLE_LOG_PATTERN}" />
</Console>
<RollingFile name="File" fileName="${FILE_PATH}" filePattern="${sys:LOG_PATH}/$${date:yyyy-MM}/app-%d{yyyy-MM-dd-HH}-%i.log.gz">
<PatternLayout>
<Pattern>${sys:FILE_LOG_PATTERN}</Pattern>
</PatternLayout>
<Policies>
<SizeBasedTriggeringPolicy size="10 MB" />
</Policies>
</RollingFile>
</Appenders>
<Loggers>
<Logger name="org.apache.catalina.startup.DigesterFactory" level="error" />
<Logger name="org.apache.catalina.util.LifecycleBase" level="error" />
<Logger name="org.apache.coyote.http11.Http11NioProtocol" level="warn" />
<logger name="org.apache.sshd.common.util.SecurityUtils" level="warn"/>
<Logger name="org.apache.tomcat.util.net.NioSelectorPool" level="warn" />
<Logger name="org.eclipse.jetty.util.component.AbstractLifeCycle" level="error" />
<Logger name="org.hibernate.validator.internal.util.Version" level="warn" />
<logger name="org.springframework.boot.actuate.endpoint.jmx" level="warn"/>
<Root level="info">
<AppenderRef ref="Console" />
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
注意:log4j2的整合和logback类似，区别就是logback默认springboot就已经内置了，所以整合log4j2的时候需要将默认的移除。