在web.xml文件中增加如下配置:
<?xml version="1.0"?>
<!--
* Copyright 2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
-->
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>log4j</servlet-name>
<servlet-class>org.springframework.web.util.Log4jConfigServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>BBS.root</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/classes/log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>60000</param-value>
</context-param> 
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
</web-app>

log4j.properties配置(按照个人需要配置日志级别):
log4j.rootLogger=DEBUG,CONSOLE
log4j.addivity.org.apache=true

# ??????
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=DEBUG
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n
#log4j.appender.CONSOLE.layout.ConversionPattern=[start]%d{DATE}[DATE]%n%p[PRIORITY]%n%x[NDC]%n%t[THREAD] n%c[CATEGORY]%n%m[MESSAGE]%n%n

之后将Log4j.jar加入到项目中,就可以在类中使用Log4j了:)
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class TestLog4j...{
private Log log=LogFactory.getLog(this.getClass());

public static void main(String[] args) ...{

if(log.isDebugEnabled())...{
log.debug("Test log4j");
}
}
}

本文介绍如何在web.xml中配置Log4j,并提供log4j.properties文件的示例配置,以便实现不同级别的日志记录。
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