log4j.xml配置实现.doc

log4j.xml配置实现先写一个Servlet的listener，用来监听服务启动，并自动解析log4j.xml文件代码如下：import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import org.apache.log4j.LogManager;import org.apache.log4j.PropertyConfigurator;import org.apache.log4j.xml.DOMConfigurator;public class Log4jConfigListener implements ServletContextListenerpublic static final String CONFIG_LOCATION_PARAM = log4jConfigLocation;public static final String XML_FILE_EXTENSION = .xml;public void contextDestroyed(ServletContextEvent event) / TODO Auto-generated method stubLogManager.shutdown();public void contextInitialized(ServletContextEvent event) / TODO Auto-generated method stubString location = event.getServletContext().getInitParameter(CONFIG_LOCATION_PARAM);if (location != null) if (!location.startsWith(/) location = / + location;location = event.getServletContext().getRealPath(location);/如果是xml结尾就用DOM解析，否则就用properties解析if (location.toLowerCase().endsWith(XML_FILE_EXTENSION) DOMConfigurator.configure(location);else PropertyConfigurator.configure(location);再写个util类，用来生成所要的不同类型的日志代码如下：package com.zhaopin.util;import org.apache.log4j.Logger;public class Log4jUtil public static Logger getSQLLogger()return Logger.getLogger(sql);public static Logger getBusinessLogger()return Logger.getLogger(business);public static Logger getSimpleErrorLogger()return Logger.getLogger(simpleError);public static Logger getNormalErrorLogger()return Logger.getLogger(normalError);下面开始写配置文件，先要在web.xml下添加信息： log4jConfigLocation /WEB-INF/Log4j.xml Log4jConfigListener最重