log4j2简单例子

布满荆棘的人生 2022-01-30 07:37 297阅读 0赞

### log4j2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][20190518172826843.png]

# maven依赖 #

<properties>
    		<maven.compiler.source>1.6</maven.compiler.source>
    		<maven.compiler.target>1.6</maven.compiler.target>
    		<log4j.version>2.3</log4j.version>
    	</properties>
    	<dependencies>
    		<dependency>
    			<groupId>org.apache.logging.log4j</groupId>
    			<artifactId>log4j-api</artifactId>
    			<version>${log4j.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.logging.log4j</groupId>
    			<artifactId>log4j-core</artifactId>
    			<version>${log4j.version}</version>
    		</dependency>
    	</dependencies>

# 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.apache.logging.log4j.LogManager;
    import org.apache.logging.log4j.Logger;
    
    public class MyApp { 
    	static Logger logger = LogManager.getLogger(MyApp.class);
    	public static void main(String[] args) { 
            logger.trace("trace level");
            logger.debug("debug level");
            logger.info("info level");
            logger.warn("warn level");
            logger.error("error level");
            logger.fatal("fatal level");
    	}
    }

# 输出结果 #

19-05-18 17:24:58.117 [main] INFO  com.sky.MyApp - info level
    19-05-18 17:24:58.117 [main] WARN  com.sky.MyApp - warn level
    19-05-18 17:24:58.117 [main] ERROR com.sky.MyApp - error level
    19-05-18 17:24:58.117 [main] FATAL com.sky.MyApp - fatal level

[20190518172826843.png]: /images/20220130/7cbf9f9983104412b6521d738e21355c.png
[https_blog.csdn.net_qq_26264237_article_details_89482985]: https://blog.csdn.net/qq_26264237/article/details/89482985