注解@slf4j

　如果不想每次都写private final Logger logger = LoggerFactory.getLogger(XXX.class); 可以用注解@Slf4j

一、在pom文件加入依赖

<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
</dependency>

二、代码

package com.sell;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
@Slf4j
public class LoggerTest {

    private  final Logger logger = LoggerFactory._getLogger_(LoggerTest.class);
    //一、传统方式实现日志
    public  void test1(){
        logger.debug("debug message");
        logger.warn("warn message");
        logger.info("info message");
        logger.error("error message");
        logger.trace("trace message");
    }

   //二、注解方式实现日志
   @Test
   public  void test2(){
        _log_.debug("debug message");
        _log_.warn("warn message");
        _log_.info("info message");
        _log_.error("error message");
        _log_.trace("trace message");
    }

}

输出如下：