l配置实现
先写一个Servlet的listener，用来监听服务启动，并自动解析l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.l.DOMConfigurator;
public class Log4jConfigListener implements ServletContextListener{
 
 public static final String CONFIG_LOCATION_PARAM = "log4jConfigLocation";
 public static final String XML_FILE_EXTENSION = ".xml";
public void contextDestroyed(ServletContextEvent event) {
  // TODO Auto-generated method stub
  LogManager.shutdown();
 }
public void contextInitialized(ServletContextEvent event) {
  // TODO Auto-generated method stub
  String location = ServletContext().getInitParameter(CONFIG_LOCATION_PARAM);
  if (location != null) {
   if (!location.startsWith("/")) {
    location = "/" + location;
   }
   location = ServletContext().getRealPath(location);
//如果是xml结尾就用DOM解析，否则就用properties解析
   if (LowerCase().endsWith(XML_FILE_EXTENSION)) {
    figure(location);
   }
   else {
    figure(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(){
  Logger("sql");
 }
 
 public static Logger getBusinessLogger(){
  Logger("business");
 }
 
 public static Logger getSimpleErrorLogger(){
param name  Logger("simpleError");
 }
 
 public static Logger getNormalErrorLogger(){
  Logger("normalError");
 }
}
下面开始写配置文件，先要在l下添加信息：
<context-param>
  <param-name>log4jConfigLocation</param-name>
  <param-value>/l</param-value>
 </context-param>
 
 
 <listener>
  <listener-class>Log4jConfigListener</listener-class>
 </listener>
最重要的l的配置信息如下：
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="/log4j/">
 <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
  <param name="target" value="System.out"/>
  <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/>
  </layout>
 </appender>
 <appender name="sql" class="org.apache.log4j.DailyRollingFileAppender">
  <param name="File" value="/usr/local/tomcat/logs/testlog4j.sql.log"/>
  <param name="Append" value="true"/>
<!-- name="DatePattern"
配置这条信息是让日志每天自动生成，名字尾部追加日期格式，
第一天生成的日志需第二天才能看到log
可以通过更改系统时间来看日志的输出
-->
  <param  name="DatePattern"  value="'.'yyyy-MM-dd"/>
  <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/>
  </layout>
 </appender>
 
 
 <appender name="business" class="org.apache.log4j.DailyRollingFileAppender">
  <param name="File" value="/usr/local/tomcat/logs/testlog4j.business.log"/>
  <param name="Append" value="true"/>
  <param  name="DatePattern"  value="'.'yyyy-MM-dd"/>
  <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/>
  </layout>
 </appender>
 
 
 <appender name="simpleError" class="org.apache.log4j.DailyRollingFileAppender">
  <param name="File" value="/usr/local/tomcat/simple.log"/>
  <param name="Append" value="true"/>
  <param  name="DatePattern"  value="'.'yyyy-MM-dd"/>
  <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/>
  </layout>
 </appender>
 
 
 <appender name="normalError" class="org.apache.log4j.DailyRollingFileAppender">
  <param name="File" value="/usr/local/tomcat/normal.log"/>
  <param name="Append" value="true"/>
  <param  name="DatePattern"  value="'.'yyyy-MM-dd"/>
  <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] (%C:%L) - %m%n"/>
  </layout>
 </appender>
       
 <logger name="sql" additivity="true">
  <priority value="info"/>
  <appender-ref ref="sql"/>
 </logger>
 <logger name="business" additivity="true">

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