log4j怎么用

Question

如题，能否给几个小例子。

Answer 1

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/classes/log4j.properties</param-value>
    </context-param>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
      </context-param>         <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>struts-default.xml,struts-plugin.xml,struts.xml</param-value>
        </init-param>
    </filter>    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
        
    
    <!-- Listener contextConfigLocation -->
      <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
      </listener>
    <!-- Listener log4jConfigLocation -->
      <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
      </listener> 
    <!-- The Welcome File List -->
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>
/WEB-INF/classes/log4j.properties 配置网上一大堆。

Answer 2

进到MyEclipse文件夹下面
搜索log4j
就会有个文件夹log4j.properties
放到src下面 就好了

Answer 3

http://hi.baidu.com/linyi12/blog/item/4014c0f2fe7d4712b07ec5a1.html
自己去看吧！

Answer 4

context-param 和listener配置就好了，log4j的配置文件里面就是配置级别了，里面可以设置保存到某个文件，控制台，邮件等等