0、在之前的SpringBoot的基础上修改

1、添加log4j2库依赖，springboot默认是用logback的日志框架的，所以也需要排除logback，不然会出现jar依赖冲突，出现日志无法写入文件，只能打印在控制台的情况。

compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.13.0'
compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.13.0'

configurations {
	providedRuntime
	all*.exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
}

2、resources下添加log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
 	<properties>
        <property name="LOG_HOME">D:/logs</property>
    </properties>

    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{yy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
        </Console>
        <File name="ErrLog" fileName="${LOG_HOME}/error.log" immediateFlush="true" append="true">
            <PatternLayout pattern="%d{yy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
        </File>
    </Appenders>
    <Loggers>
        <Root level="all">
            <AppenderRef ref="Console" level="error"/>
            <AppenderRef ref="ErrLog" level="error" />
        </Root>
    </Loggers>
</Configuration>

3、Controller中添加日志打印

logger.error(String.format(template, name));