log4j2 + slf4j 简单例子

Bertha 。 2022-01-30 07:45 236阅读 0赞

### log4j2 + slf4j 简单例子 ###

*  项目结构
 *  maven依赖
 *  log4j2.xml配置文件
 *  java例子
 *  输出结果

# 项目结构 #

![在这里插入图片描述][20190518175758830.png]

# maven依赖 #

<dependency>
    			<groupId>org.apache.logging.log4j</groupId>
    			<artifactId>log4j-slf4j-impl</artifactId>
    			<version>2.3</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.logging.log4j</groupId>
    			<artifactId>log4j-jcl</artifactId>
    			<version>2.3</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.logging.log4j</groupId>
    			<artifactId>log4j-core</artifactId>
    			<version>2.3</version>
    		</dependency>

# log4j2.xml配置文件 #

配置文件详细说明：  
[https://blog.csdn.net/qq\_26264237/article/details/89482985][https_blog.csdn.net_qq_26264237_article_details_89482985]

<?xml version="1.0" encoding="UTF-8"?>
    <Configuration>  
    	<Appenders>
    		<Console name="Console" target="SYSTEM_OUT">
    			<PatternLayout pattern="%d{yy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
    		</Console>
    	</Appenders>
    	<Loggers>
    		<logger name="org.springframework" level="info"></logger>
    		<root level="info">
    			<AppenderRef ref="Console" />
    		</root>
    	</Loggers>
    </Configuration>

# java例子 #

package com.sky;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class MyAppSlf4j { 
    	private final static Logger log = LoggerFactory.getLogger(MyAppSlf4j.class);
    
    	public static void main(String[] args) { 
    		log.trace("{} level", "trace");
    		log.debug("{} level", "debug");
    		log.info("{} level", "info");
    		log.warn("{} level", "warn");
    		log.error("{} level", "error");
    	}
    }

# 输出结果 #

19-05-18 17:58:53.577 [main] INFO  com.sky.MyAppSlf4j - info level
    19-05-18 17:58:53.577 [main] WARN  com.sky.MyAppSlf4j - warn level
    19-05-18 17:58:53.577 [main] ERROR com.sky.MyAppSlf4j - error level

[20190518175758830.png]: /images/20220130/d1878e4761314a1cb66e0dd41fbdb9be.png
[https_blog.csdn.net_qq_26264237_article_details_89482985]: https://blog.csdn.net/qq_26264237/article/details/89482985