方法如下 1、去掉所有log4j的相关依赖，主要有：
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j2</artifactId> </dependency>以及
<dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> </dependency>2、SpringBoot项目中依赖包spring-boot-starter中已经包含spring-boot-starter-logging，该依赖包就是默认的logback日志框架，则不需额外引入。但是要看项目中有没有排除掉，如下，有的话删除掉或者注释掉就OK了
<exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions>以下是非springboot项目则需要添加以下依赖
<!-- logback日志配置开始 --> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-core</artifactId> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-access</artifactId> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>log4j-over-slf4j</artifactId> </dependency> <!-- logback日志配置结束 -->3、删除项目下/src/main/resources目录下的log4j.properties，并在该目录添加logback.xml文件，logback.xml文件如下：
<?xml version="1.0" encoding="UTF-8" ?> <configuration scan="true" scanPeriod="30 seconds"> <property name="logBase" value="./logs"/> <property name="log.archive.max.file.size" value="60MB"/> <property name="log.archive.max.history" value="15"/> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern> <!-- %highlight(%-5level)日志级别高亮显示 --> %date [%thread] %highlight(%-5level) %logger{10} [%file:%line] %msg%n </pattern> <charset>UTF-8</charset> </encoder> </appender> <!-- 服务日志 --> <appender name="GW_ROOT_LOG" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>${logBase}/${serviceName}_ROOT.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy"> <!-- rollover daily --> <fileNamePattern>${logBase}/${serviceName}_ROOT-%d{yyyy-MM-dd}.%i.log </fileNamePattern> <maxHistory>${log.archive.max.history}</maxHistory> <maxFileSize>${log.archive.max.file.size}</maxFileSize> </rollingPolicy> <encoder> <pattern>%date [%thread] [%X{requestId}] %highlight(%-5level) %logger{10} [%file:%line] %msg%n</pattern> <charset>UTF-8</charset> </encoder> </appender> <root level="INFO"> <appender-ref ref="CONSOLE"/> <appender-ref ref="FILE"/> </root> </configuration>4、最后在application.yml中替换logging的指向地址
logging: config: classpath:logback.xml