1、添加依赖

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.21</version>
    </dependency>

2、添加配置文件 log4j.properties

# Output pattern : date [thread] priority category - message
log4j.rootLogger=WARN,CONSOLE,RollingFile

#CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n

#RollingFile
log4j.appender.RollingFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.RollingFile.File=/opt/logs/root.log
log4j.appender.RollingFile.layout=org.apache.log4j.PatternLayout
log4j.appender.RollingFile.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n

#Project default level
log4j.logger.com.bw=debug

3、使用日志

@Controller
@Slf4j
@RequestMapping(value = "/index")
public class IndexController {

    @RequestMapping(value = "/test")
    public String test() {
        log.info("这是log4j日志的测试");
        return "test";
    }
}

• 代码效果

• 日志文件

• 日志输出