技巧分享——log4j的配制及测试程序

1，写个初始化的SERVLET：

package net.welovetennis.util.log;

import javax.servlet.*;

import javax.servlet.http.*;

import org.apache.log4j.*;

/**

* <pTitle: </p

* <pDescription: </p

* <pCopyright: Copyright (c) 2004</p

* <pCompany: </p

* @author not attributable

* @version 1.0

*/

public class Log4jInit extends HttpServlet {

//Initialize global variables

public void init() throws ServletException {

String prefix =

getServletContext().getRealPath("/");

String file = getInitParameter("log4j");

// if the log4j-init-file is not set, then no point in trying

System.out.println("................log4j start");

if(file != null) {

PropertyConfigurator.configure(prefix+file);

}

}

//Process the HTTP Get request

public void doGet(HttpServletRequest request, HttpServletResponse response) {

}

//Clean up resources

public void destroy() {

}

}

2，修改WEB。XML：

<servlet

<servlet-namelog4jinit</servlet-name

<servlet-classnet.welovetennis.util.log.Log4jInit</servlet-class

<init-param

<param-namelog4j</param-name

<param-valueWEB-INF/log4j.properties</param-value

</init-param

<load-on-startup1</load-on-startup

</servlet

3，在WEB-INF下放配制文件log4j.properties，并指定输出路径：

log4j.rootLogger=INFO, A1 , R

log4j.appender.A1=org.apache.log4j.ConsoleAppender

log4j.appender.A1.layout=org.apache.log4j.PatternLayout

log4j.appender.A1.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender

log4j.appender.R.File=c:/project/david/racquet/logs/log4j.log

log4j.appender.R.MaxFileSize=100KB

log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.layout=org.apache.log4j.PatternLayout

log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n