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.*;
/** * <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，修改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，并指定输出路径：
log4j.rootlogger=INFO, A1 , Rlog4j.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%nlog4j.appender.R=org.apache.log4j.RollingFileAppenderlog4j.appender.R.File=c:/project/david/racquet/logs/log4j.loglog4j.appender.R.MaxFileSize=100KBlog4j.appender.R.MaxBackupIndex=1log4j.appender.R.layout=org.apache.log4j.PatternLayoutlog4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n