import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.ComponentScan;
@ComponentScan
@ConfigurationProperties("classpath:log4j.properties")
public class Log4jConfigure {
}

   <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
    </dependency>

import com.dome.dao.UserMapper;
import com.entity.User;
 @RestController
 @RequestMapping({"/home"})
 public class UserController {
 private static Logger log = Logger.getLogger(UserController.class);
     log.debug("debug加载默认用户成功");
     log.info("加载默认用户成功");
     log.error("遇到错误，回滚成功")
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
   <settings>
  <setting name="logImpl" value="LOG4J"/>
</settings>
</configuration>