log4j2 实际使用详解

2023-08-12 20:52:52

转载至：

https://blog.csdn.net/vbirdbest/article/details/71751835

如下是maven项目中的实例：

首先pom.xml中引入如下依赖，注意看都是2.××××开头的版本，所以就是log4j2需要的依赖。

        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->

        <dependency>

            <groupId>org.apache.logging.log4j</groupId>

            <artifactId>log4j-core</artifactId>

            <version>2.11.2</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->

        <dependency>

            <groupId>org.apache.logging.log4j</groupId>

            <artifactId>log4j-api</artifactId>

            <version>2.11.2</version>

        </dependency>

package com.yuanqiao.spring;

/**

 * 这个包的路径一定要对才行。

 */

import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.web.context.support.XmlWebApplicationContext;

import com.yuanqiao.mbean.beans.SpringPersonMBean;

public class SpringApplicationContext {

	static Logger logger=LogManager.getLogger("Console");

	public static void main(String[] args) {

		logger.debug("this is the debug message");

		logger.info("this is the debug message");

		logger.error("this is the debug message");

		ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");

		SpringPersonMBean bean = (SpringPersonMBean)applicationContext.getBean("personMBean");

		System.out.println(bean.getName());

	}

}

在maven项目中的src/main/resoures下面建一个log4j2.xml文件，里面的内容如下：

<?xml version="1.0" encoding="UTF-8"?>

<Configuration status="WARN">

    <Appenders>

        <Console name="Console" target="SYSTEM_OUT">

            <PatternLayout pattern="%d{YYYY-MM-dd HH:mm:ss} [%t] %-5p %c{1}:%L - %msg%n" />

        </Console>

        <RollingFile name="RollingFile" filename="log/test.log"

            filepattern="${logPath}/%d{YYYYMMddHHmmss}-fargo.log">

            <PatternLayout pattern="%d{YYYY-MM-dd HH:mm:ss} [%t] %-5p %c{1}:%L - %msg%n" />

            <Policies>

                <SizeBasedTriggeringPolicy size="10 MB" />

            </Policies>

            <DefaultRolloverStrategy max="20" />

        </RollingFile>

    </Appenders>

    <Loggers>

        <Root level="info">

            <AppenderRef ref="Console" />

            <AppenderRef ref="RollingFile" />

        </Root>

    </Loggers>

</Configuration>

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