JBuilder2005+JBoss-4.0.2RC1+J2SDK1.5+Log4j 开发Session Bean例解（2）

答案：
作者：Junsan Jin

日期：2005-3-30

版本：1.0

信箱：junsan21@126.com ; junnef21@sohu.com

声明：本人保留本文的所有权利。





第二部分：配置Log4j







Log4j主要是针对java的日志文件产生管理包，这里使用logging-log4j-1.2.9。解压logging-log4j-1.2.9的压缩包，任意路径即可，这里是D:\logging-log4j-1.2.9。







先在JBuilder中建立工程，然后引入log4j库文件。 



新建工程：







选择菜单：new project…，name为Trader，点击finish。







这里工程目录为：E:\projects\Trader。 



拷贝类库：







在trader文件夹下新建lib文件夹，拷贝D:\logging-log4j-1.2.9\dist\lib\log4j-1.2.9.jar到E:\projects\Trader\lib下。 



将类库引入工程：







选择菜单：project〉project properties 〉Paths 〉右边Tab页Required Libraries > Add > Tab页Archives，选择E:\projects\Trader\lib，右边的列表框中选择log4j-1.2.9.jar，一路ok即可。 



新建web模块：







选择菜单：New 〉 Web 〉Web module（WAR）〉 OK按钮 〉Create Empty Web Module 〉 Next按钮，填入名称WebTrader，点击Finish按钮。 



增加properties配置文件：







在JBuilder左边的菜单树上选择WebTrader 〉Module Directory 〉选中WEB-INF 〉右键new 〉File，填入log4j.properties确定即可。







编辑log4j.properties的内容如下：







-------------------------------------------------







log4j.properties







--------------------------------------------------







# For the general syntax of property based configuration files see the







# documenation of org.apache.log4j.PropertyConfigurator. 



# The root category uses the appender called A1. Since no priority is







# specified, the root category assumes the default priority for root







# which is DEBUG in log4j. The root category is the only category that







# has a default priority. All other categories need not be assigned a







# priority in which case they inherit their priority from the







# hierarchy. 



log4j.rootCategory=, A1 



# A1 is set to be a FileAppender which outputs to the file







# "factor.log". Start the server NumberCruncherServer and two







# NumberCruncherClients, and ask to factor two numbers







# near-simultaneously. Notice that the log output from these two







# requests are logged in the file factor.log. Nevertheless, the logs







# of these requests can still be distinguished given their distinct







# nested diagnostic contexts. 



log4j.appender.A1=org.apache.log4j.FileAppender







log4j.appender.A1.File=${jboss.server.home.dir}/log/trader.log







log4j.appender.A1.layout=org.apache.log4j.PatternLayout 



# Note the %x conversion specifier for NDC printing.







# log4j.appender.A1.layout.ConversionPattern=%-4r %-5p [%t] (%x) - %m\n







log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n







Log4j.appender.A1.MaxFileSize=100KB 



增加log4j环境初始化类：







右键点击菜单树中Trader.jpx 〉 New 〉Package，填入com.inspiresky.trader.init，确定即可。







右键点击新建的init包〉new 〉class，名字为Log4jInit.java，确定所在包为com.inspiresky.trader.init，点击OK键即可。







编辑Log4jInit.java的内容如下：







-----------------------------------------------------







Log4jInit.java







-----------------------------------------------------







package com.inspiresky.trader.init; 



import org.apache.log4j.PropertyConfigurator;







import javax.servlet.http.HttpServlet;







import javax.servlet.http.HttpServletRequest;







import javax.servlet.http.HttpServletResponse;







import java.io.PrintWriter;







import java.io.IOException;







import javax.servlet.ServletException; 



public class Log4jInit extends HttpServlet { 



    //Initialize global variables







    public void init() throws ServletException {







        String prefix =  getServletContext().getRealPath("/");







        String file = getInitParameter("log4j-init-file");







        // if the log4j-init-file is not set, then no point in trying







        if(file != null) {







            PropertyConfigurator.configure(prefix+file);







        }







    } 



    public void doGet(HttpServletRequest req, HttpServletResponse res) {







    } 



    //Clean up resources







    public void destroy() {







    }







} 



配置web.xml文件：







在JBuilder左边的菜单树上选择WebTrader 〉Module Directory 〉WEB-INF 下，打开web.xml，在<display-name>WebTrader</display-name>下增加如下内容：







<servlet>







    <servlet-name>log4j-init</servlet-name>







    <servlet-class>com.inspiresky.trader.init.Log4jInit</servlet-class>







    <init-param>







      <param-name>log4j-init-file</param-name>







      <param-value>WEB-INF/log4j.properties</param-value>







    </init-param>







    <load-on-startup>1</load-on-startup>







  </servlet> 



OK，至此我们的Log4j已经可以正常使用了。(未完待续)

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