在pom.xml文件中添加相关依赖：
<!--配置log4j--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j2</artifactId> </dependency> <!-- 加上这个才能辨认到log4j2.yml文件 --> <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-yaml</artifactId> <version>2.9.3</version> </dependency> 2.去除其他log依赖应该去除掉其他依赖中包含的log依赖，否则会有冲突。去除依赖的代码如下：
<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> <!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> <exclusions> <exclusion> <!--配置log4j--> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> 3.添加日志配置文件在resource文件夹下添加log4j2.yml文件，文件内容如下：
Configuration: status: warn Properties: # 定义全局变量 Property: # 缺省配置（用于开发环境）。其他环境需要在VM参数中指定，如下： #测试：-Dlog.level.console=warn -Dlog.level.xjj=trace #生产：-Dlog.level.console=warn -Dlog.level.xjj=info - name: log.level.console value: trace - name: log.level.xjj value: trace - name: log.path value: logs - name: project.name value: my-spring-boot Appenders: Console: #输出到控制台 name: CONSOLE target: SYSTEM_OUT ThresholdFilter: level: ${sys:log.level.console} # “sys:”表示：如果VM参数中没指定这个变量值，则使用本文件中定义的缺省全局变量值 onMatch: ACCEPT onMismatch: DENY PatternLayout: pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" RollingFile: # 输出到文件，超过128MB归档 - name: ROLLING_FILE ignoreExceptions: false fileName: ${log.path}/${project.name}.log filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz" PatternLayout: pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" Policies: SizeBasedTriggeringPolicy: size: "128 MB" DefaultRolloverStrategy: max: 1000 - name: EXCEPTION ignoreExceptions: false fileName: ${log.path}/exception.log filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz" PatternLayout: pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" Policies: SizeBasedTriggeringPolicy: size: "128 MB" DefaultRolloverStrategy: max: 1000 - name: WEB_REQUEST ignoreExceptions: false fileName: ${log.path}/web_request.log filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz" PatternLayout: pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" Policies: SizeBasedTriggeringPolicy: size: "128 MB" DefaultRolloverStrategy: max: 1000 - name: MYBATIS_SQL ignoreExceptions: false fileName: ${log.path}/mybatis_sql.log filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz" PatternLayout: pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" Policies: SizeBasedTriggeringPolicy: size: "128 MB" DefaultRolloverStrategy: max: 1000 - name: TIME_TASK ignoreExceptions: false fileName: ${log.path}/time_task.log filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz" PatternLayout: pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" Policies: SizeBasedTriggeringPolicy: size: "128 MB" DefaultRolloverStrategy: max: 1000 - name: ASYNC_TASK ignoreExceptions: false fileName: ${log.path}/async_task.log filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz" PatternLayout: pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n" Policies: SizeBasedTriggeringPolicy: size: "128 MB" DefaultRolloverStrategy: max: 1000 Loggers: Root: level: info AppenderRef: - ref: CONSOLE - ref: ROLLING_FILE Logger: - name: WEB_REQUEST_LOG additivity: false level: info AppenderRef: - ref: WEB_REQUEST - name: com.example.demo.business #打印sql执行日志 additivity: false level: trace AppenderRef: - ref: MYBATIS_SQL - name: TIME_TASK_LOG additivity: false level: trace AppenderRef: - ref: TIME_TASK - name: ASYNC_TASK_LOG additivity: false level: trace AppenderRef: - ref: ASYNC_TASK - name: EXCEPTION_LOG additivity: false level: trace AppenderRef: - ref: EXCEPTION需要注意在配置文件中Logger:标签下添加多个日志项目。其中
- name: com.example.demo.business #打印sql执行日志 additivity: false level: trace AppenderRef: - ref: MYBATIS_SQL配置为打印mybatis执行的sql语句。
4.重启项目重启项目，日志配置即可成功。