log4j的配制及测试程序[Java编程]

1,写个初始化的SERVLET:

package net.welovetennis.util.log;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.log4j.*;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2004</p>
* <p>Company: </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,改正WEB.XML:

<servlet>
　　 <servlet-name>log4jinit</servlet-name>
　　 <servlet-class>net.welovetennis.util.log.Log4jInit</servlet-class>
　　 <init-param>
<param-name>log4j</param-name>
<param-value>WEB-INF/log4j.properties</param-value>
　　 </init-param>
　　 <load-on-startup>1</load-on-startup>
　 </servlet>

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

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