log4j的应用

第一步 建立一个log4j.properties文件

建立这个文件必须遵守这三个关则
1.logger组件
   log4j.rootLogger {off,fatal,error,warn,..},appenderName..
2.appender组件
   log4j.appender.appenderName=org.apache.log4j.[FileAppender,..]
3.layout组件
   log4j.appender.appenderName.layout=org.apache.log4j.[SimpleLayout,]

eg.
   log4j.rootLogger=warn,A1

   log4j.appender.A1=org.apache.log4j.FileAppender

   log4j.appender.A1.File=d:/log.txt

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


然后倒入这样一个包log4j-1.2.15.jar
然后可以在action里面应用她的日志信息了
新建一个action
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.vt.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.vt.struts.form.RegisterForm;

/**
* MyEclipse Struts
* Creation date: 06-26-2008
*
* XDoclet definition:
* @struts.action path="/register" name="registerForm" input="/register.jsp" scope="request" validate="true"
*/
public class RegisterAction extends Action {
/*
* Generated Methods
*/

/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
RegisterForm registerForm = (RegisterForm) form;

org.apache.log4j.Logger log=org.apache.log4j.Logger.getLogger(RegisterAction.class);

log.trace("trace");
log.debug("debug");
log.warn("warn");


return null;

}
}
这样就可以调用这个日志信息来调试程序了

写得不好  如果哪里不对的欢迎指出来