Eclipse+Servlet 2.5 的Struts2项目使用Log4j2

在J2EE中如何使用Log4j2可以查阅官方文档：http://logging.apache.org/log4j/2.x/manual/webapp.html

以下是一个简单的DEMO：

1、首先创建一个名为Log4j2InJ2EEDemo的项目，配置如下：

2、导入struts2相关的包，并进行基础配置，参考：http://blog.csdn.net/axwolfer/article/details/40057941

3、导入log4j2相关的包，在src项目添加log4j2.xml配置文件，配置如下：

配置中我们有两个Appender，一个时标准的系统输出，一个是滚动文件，注意这里滚动文件我设置了"logs/demorolling.log"，用这个配置时，在Eclipse中调试，最终的日志会输出到Eclipse的安装目录下，在安装目录下会创建logs文件夹

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
	
    
  <Appenders>
  <Console name="Console" target="SYSTEM_OUT">
      <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %M-%L- %msg%n"/>
    </Console>
    <RollingFile name="RollingFile" fileName="logs/demorolling.log"
                 filePattern="logs/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">
      <PatternLayout>
        <Pattern>%d{MM-dd-yyyy} %p %c{1.} [%t] -%M-%L- %m%n</Pattern>
      </PatternLayout>
      <Policies>
        <TimeBasedTriggeringPolicy />
        <SizeBasedTriggeringPolicy size="1 KB"/>
      </Policies>
      <DefaultRolloverStrategy fileIndex="max" max="2"/>
    </RollingFile>
  </Appenders>
  <Loggers>
  <Logger name="com.log4j2inj2eedemo" level="trace">
      	<AppenderRef ref="Console"/>
		</Logger>
    <Root level="trace">
      <AppenderRef ref="RollingFile"/>
    </Root>
  </Loggers>

</Configuration>

4、创建一个名为com.log4j2inj2eedemo.Demo的Action，代码如下：

package com.log4j2inj2eedemo;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.opensymphony.xwork2.ActionSupport;


public class Demo extends ActionSupport {
	private static final Logger logger = LogManager.getLogger(Demo.class);

	/* (non-Javadoc)
	 * @see com.opensymphony.xwork2.ActionSupport#execute()
	 */
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		logger.info("This is just a test.");
		return SUCCESS;
	}
}

5、添加一个名为index.jsp的页面，页面内容随便写，如：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<p>This is just a test.</p>
</body>
</html>

6、在sturts.xml中配置demo和index.jsp的对应关系：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

<constant name="struts.enable.DynamicMethodInvocation" value="true"/>  

<package name="default" extends="struts-default">
		<action name="demo" class="com.log4j2inj2eedemo.Demo">
            <result name="success">/index.jsp</result>
        </action>
	</package>

</struts>

7、在web.xml中配置我们的Log4j配置文件及log4j的过滤器：

<?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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Log4j2InJ2EEDemo</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
   <filter>  
        <filter-name>struts2</filter-name>  
        <filter-class>  
            org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter  
        </filter-class>  
    </filter>  
    <filter-mapping>  
        <filter-name>struts2</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>
    
    <context-param>
        <param-name>isLog4jAutoInitializationDisabled</param-name>
        <param-value>false</param-value>
    </context-param>
    
	<context-param>
        <param-name>log4jConfiguration</param-name>
        <param-value>/WEB-INF/classes/log4j2.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.apache.logging.log4j.web.Log4jServletContextListener</listener-class>
    </listener>
 
    <filter>
        <filter-name>log4jServletFilter</filter-name>
        <filter-class>org.apache.logging.log4j.web.Log4jServletFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>log4jServletFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>INCLUDE</dispatcher>
        <dispatcher>ERROR</dispatcher>
       
    </filter-mapping>
</web-app>

8、最终项目结构如下：

9:、启动调试，在浏览器地址栏输入：http://localhost:8080/Log4j2InJ2EEDemo/demo.action

查看Eclipse安装目录下新创建的logs文件夹及记录的日志：

10、把项目导出成WAR到tomcat的webapps目录下，重启tomcat系统会自动部署Log4j2InJ2EEDemo项目，启动完成后，在浏览器地址栏重新输入http://localhost:8080/Log4j2InJ2EEDemo/demo.action，然后去查找日志的时候找不到日志了，我使用的是win8系统，这种情况下修改log4j.xml，把RollingFile的fileName属性修改为fileName="/logs/demorolling.log"然后重新导出WAR，重新启动tomcat并浏览Index页面，此时在C盘根目录下便可以找到logs/demorolling.log文件

Eclipse+Servlet 2.5 的Struts2项目使用Log4j2

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