log4j2 实际使用详解

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>