在javaweb项目中使用log4j

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log4j1.2.15英文教程http://www.tutorialspoint.com/log4j/log4j_quick_guide.htm
本篇博客参考http://www.codejava.net/frameworks/spring/how-to-use-log4j-in-spring-mvc
步骤如下：

添加依赖

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<dependency>
	<groupId>log4j</groupId>
	<artifactId>log4j</artifactId>
	<version>1.2.17</version>
</dependency>

新建log4j配置文件

注：此处针对myeclipse环境
在src/main/resources目录下新建log4j.properties配置文件，如下

log4j.properties文件内容如下：

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# LOG4J configuration
log4j.rootLogger=INFO, Appender1, Appender2
 
log4j.appender.Appender1=org.apache.log4j.ConsoleAppender
log4j.appender.Appender1.layout=org.apache.log4j.PatternLayout
log4j.appender.Appender1.layout.ConversionPattern=%-7p %d [%t] %c %x - %m%n
 
log4j.appender.Appender2=org.apache.log4j.FileAppender
log4j.appender.Appender2.File=D:/Logs/SpringMVC.log
log4j.appender.Appender2.layout=org.apache.log4j.PatternLayout
log4j.appender.Appender2.layout.ConversionPattern=%-7p %d [%t] %c %x - %m%n

以上配置也可通过XML完成。在src/main/resources目录下新建log4j.xml，包含如下内容

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC "-//log4j/log4j Configuration//EN" "log4j.dtd">
 
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
 
    <appender name="Appender1" class="org.apache.log4j.ConsoleAppender">
       <layout class="org.apache.log4j.PatternLayout">
          <param name="ConversionPattern" value="%-7p %d [%t] %c %x - %m%n"/>
       </layout>
    </appender>
  
    <appender name="Appender2" class="org.apache.log4j.FileAppender">
       <param name="File" value="D:/Logs/SpringMVC2.log" />
       <layout class="org.apache.log4j.PatternLayout">
          <param name="ConversionPattern" value="%-7p %d [%t] %c %x - %m%n"/>
       </layout>
    </appender>
 
    <root>
        <priority value="INFO"/>
        <appender-ref ref="Appender1" />
        <appender-ref ref="Appender2" />
    </root>
     
</log4j:configuration>

到此为止，log4j已经配置完成。

测试

在src/main/java目录下新建一个LogTest类，内容如下：

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package com.simon.log4jdemo;

import org.apache.log4j.Logger;

public class LogTest {
	private static Logger logger = Logger.getLogger(LogTest.class);
	
	public static void main(String[] args) {
		logger.info("this is info");
		logger.error("this is error");
	}
}

LogTest.java右键，选择Run As——>Java Application，控制台输出如下

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