注解@Slf4j

水深无声 2021-09-17 12:16 307阅读 0赞

[https://blog.csdn.net/cslucifer/article/details/80953400][https_blog.csdn.net_cslucifer_article_details_80953400]

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;  
  
*/\*\**  
* \*   日志测试*  
* \*/*  
  
@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*  
*     \*/*  
*    *@Test  
    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：

![727732-20171007005038333-722076757.png][]

因为默认是输出 info之上的 ， 由下图可知 debug，trace不输出

![727732-20171007005125724-514302687.png][]

三、注意：如果注解@Slf4j注入后找不到变量log，那就给IDE安装lombok插件，、

下面以idea为例

1、File  → settings →  Plugins,  然后点击“Browse repositories” 如图

![727732-20171007005153630-156372538.png][]

2、输入 lombok 搜索插件， 点install安装，安装完重启idea

![727732-20171007005212755-557704490.png][]

这时候输入 log就可以有提示了

[https_blog.csdn.net_cslucifer_article_details_80953400]: https://blog.csdn.net/cslucifer/article/details/80953400
[727732-20171007005038333-722076757.png]: /images/20210527/77f5bd9bcd1642d78001d74fdd9e9e10.png
[727732-20171007005125724-514302687.png]: /images/20210527/2e6ef0847544433e8b17ae99fb342db4.png
[727732-20171007005153630-156372538.png]: /images/20210527/924f9fe69a934f2b8c46a9de1a01d4d6.png
[727732-20171007005212755-557704490.png]: /images/20210527/88fa86b92f514db4828ce59d3493ea97.png