Session
Author: Junsan Jin
Date: 2005-3-30
Version: 1.0
Mailbox: junsan21@126.com; Junnef21@sohu.com
Disclaimer: I reserve all the rights of this article.
Part II: Configuring LOG4J
LOG4J is primarily a Java-generated Management Pack for log files, using logging-log4j-1.2.9 here. Decompression logging-log4j-1.2.9 compressed package, any path can be, here is D:\logging-log4j-1.2.9.
First build the project in the JBuilder and then introduce the log4j library file.
New project:
Select menu: New project...,name for trader, click Finish.
The project directory here is: E:\projects\Trader.
Copy class Library:
Create a new Lib folder under the Trader folder, and copy D:\logging-log4j-1.2.9\dist\lib\log4j-1.2.9.jar to E:\projects\Trader\lib.
To introduce a class library into engineering:
Select menu: Project〉project properties〉paths〉 Right tab required libraries > Add > tab page Archives, select E:\projects\Trader\lib, Select Log4j-1.2.9.jar in the list box on the right, all the way OK.
New Web module:
Select Menu: New〉web〉web module (WAR) 〉ok button 〉create Empty Web module〉next button, fill in name Webtrader, click the Finish button.
To increase the properties configuration file:
In the menu tree on the left of JBuilder select Webtrader〉module directory〉 Select web-inf〉 Right button new〉file, fill in log4j.properties OK.
The contents of the edited log4j.properties are as follows:
-------------------------------------------------
Log4j.properties
--------------------------------------------------
# for the general syntax the based configuration files
# 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 '
# has a default priority. All other categories need is assigned a
# priority in which case they inherit their priority from the
# hierarchy.
log4j.rootcategory=, A1
# A1 is set to being 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 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
# 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
Add log4j Environment Initialization class:
Right-click in the menu tree trader.jpx〉new〉package, fill in the Com.inspiresky.trader.init, OK.
Right-click the new init package 〉new〉class, name Log4jinit.java, determine where the package is com.inspiresky.trader.init, click OK button.
The contents of the edited Log4jinit.java are as follows:
-----------------------------------------------------
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 isn't 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 () {
}
}
To configure the Web.xml file:
In the menu tree on the left of JBuilder select Webtrader〉module directory〉web-inf, open Web.xml, <display-name>webtrader</display-name > Add the following content:
<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, so far our log4j have been able to use the normal. (To be continued)
