IDC资讯中心
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)
