package com.wyp.helper;

 import org.apache.log4j.Logger;

 public class LoggerHelper {

     private static Logger _logger = Logger.getLogger(LoggerHelper.class);

     private static String newLine = System.getProperty("line.separator");

     public static void info(Logger logger, String message) {

         logger.info(newLine);

         logger.info(message);

     }

     public static void info(Logger logger, String message, Throwable exception) {

         logger.info(newLine);

         logger.info(message, exception);

     }

     public static void debug(Logger logger, String message) {

         logger.debug(newLine);

         logger.debug(message);

     }

     public static void debug(Logger logger, String message, Throwable exception) {

         logger.debug(newLine);

         logger.debug(message, exception);

     }

     public static void error(Logger logger, String message) {

         logger.error(newLine);

         logger.error(message);

     }

     public static void error(Logger logger, String message, Throwable exception) {

         logger.error(newLine);

         logger.error(message, exception);

     }

     public static void info(String message) {

         _logger.info(newLine);

         _logger.info(message);

     }

     public static void info(String message, Throwable exception) {

         _logger.info(newLine);

         _logger.info(message, exception);

     }

     public static void debug(String message) {

         _logger.debug(newLine);

         _logger.debug(message);

     }

     public static void debug(String message, Throwable exception) {

         _logger.debug(newLine);

         _logger.debug(message, exception);

     }

     public static void error(String message) {

         _logger.error(newLine);

         _logger.error(message);

     }

     public static void error(String message, Throwable exception) {

         _logger.error(newLine);

         _logger.error(message, exception);

     }

 }

 package helper;

 import java.io.File;

 import javax.servlet.ServletContext;

 import javax.servlet.ServletContextEvent;

 import javax.servlet.ServletContextListener;

 import org.apache.log4j.Logger;

 import org.apache.log4j.PropertyConfigurator;

 public class Global implements ServletContextListener {

     private Logger _logger = Logger.getLogger(Global.class);

     @Override

     public void contextDestroyed(ServletContextEvent arg0) {

         // TODO Auto-generated method stub

         LoggerHelper.info(_logger, "网站停止");

     }

     @Override

     public void contextInitialized(ServletContextEvent arg0) {

         // TODO Auto-generated method stub

         ServletContext sc = arg0.getServletContext();

         String prefix = sc.getRealPath("/WEB-INF");

         String file = "log4j.properties";

         String configPath = prefix + File.separator + file;

         String logFilePath = sc.getRealPath("/");

         System.setProperty("tomcat", logFilePath);

         PropertyConfigurator.configure(configPath);

         LoggerHelper.info(_logger, "网站启动");

     }

 }

 <?xml version="1.0" encoding="UTF-8"?>

 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns="http://java.sun.com/xml/ns/javaee"

     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

     id="WebApp_ID" version="3.0">

     <display-name>JspLog4j</display-name>

     <listener>

         <listener-class>helper.Global</listener-class>

     </listener>

     <welcome-file-list>

         <welcome-file>index.jsp</welcome-file>

     </welcome-file-list>

     <error-page>

         <error-code>500</error-code>

         <location>/error.jsp</location>

     </error-page>

 </web-app>

 <%@page import="com.wyp.helper.LoggerHelper"%>

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8" isErrorPage="true"%>

 <%

     response.setStatus(200);

     String newLine = System.getProperty("line.separator");

     StringBuilder sb = new StringBuilder();

     sb.append(newLine);

     sb.append("访问的路径：");

     sb.append(newLine);

     sb.append(request.getRequestURI());

     sb.append(newLine);

     sb.append("异常信息：");

     sb.append(newLine);

     sb.append(exception.getClass() + " : " + exception.getMessage());

     Map<String,String[]> map = request.getParameterMap();

     if (map.size()>0) {

         sb.append(newLine);

         sb.append("请求参数：");

         sb.append(newLine);

         for(Map.Entry<String,String[]> entry : map.entrySet()){

             String key = entry.getKey();

             String[] values = entry.getValue();

             sb.append(key+"=");

             for(String value : values){

                 sb.append(value+",");

             }

         }

         sb.append(newLine);

     }

     LoggerHelper.error(sb.toString(),exception);

 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <html>

   <head>

     <title>自定义错误页面</title>

   </head>

   <body>

     <h1>自定义错误页面</h1>

   </body>

 </html>

 log4j.rootLogger=debug,stdout,logfile

 log4j.appender.stdout=org.apache.log4j.ConsoleAppender

 log4j.appender.stdout.Target=System.err

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

 log4j.appender.logfile=org.apache.log4j.DailyRollingFileAppender

 log4j.appender.logfile.File=${tomcat}/logs/website.txt

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

 log4j.appender.logfile.DatePattern='.'yyyy-MM-dd

 log4j.appender.logfile.layout.ConversionPattern=%n%d{yyyy-MM-dd HH\:mm\:ss} %F %m