�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#19968;&#21306;&#20108;&#21306;&#19977;&#21306;&#20013;&#25991;&#44;&#20037;&#20037;&#57;&#57;&#20037;&#20037;&#57;&#57;&#31934;&#21697;&#34588;&#26586;&#20256;&#23186;&#44;&#57;&#55;&#20037;&#20037;&#31934;&#21697;</title><link>http://www.aygfsteel.com/RongHao/category/5414.html</link><description>勤学、勤�?/description><language>zh-cn</language><lastBuildDate>Fri, 15 Jan 2010 00:43:46 GMT</lastBuildDate><pubDate>Fri, 15 Jan 2010 00:43:46 GMT</pubDate><ttl>60</ttl><item><title>奇文��p���Q�《百度孙云丰��_��Google市侩�Q�我感到恶心�?转帖)</title><link>http://www.aygfsteel.com/RongHao/archive/2010/01/14/309438.html</link><dc:creator>ronghao</dc:creator><author>ronghao</author><pubDate>Thu, 14 Jan 2010 05:29:00 GMT</pubDate><guid>http://www.aygfsteel.com/RongHao/archive/2010/01/14/309438.html</guid><wfw:comment>http://www.aygfsteel.com/RongHao/comments/309438.html</wfw:comment><comments>http://www.aygfsteel.com/RongHao/archive/2010/01/14/309438.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/RongHao/comments/commentRss/309438.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/RongHao/services/trackbacks/309438.html</trackback:ping><description><![CDATA[<div style="font-size: 14px; line-height: 25px; text-indent: 25px;"><span style="color: #800000;">今天下午1�?0分，癑ֺ�首席产品设计师孙云丰在自��q��博客中撰文关于谷歌退��Z��国，直指Google退��Z��国的姿态证明自己是市侩分子�Q�对此感到恶心�?br />
</span></div>
<div style="font-size: 14px; line-height: 25px; text-indent: 25px;"><span style="color: #800000;">他的博客全文如下�Q?br />
</span></div>
<div style="font-size: 14px; line-height: 25px; text-indent: 25px;"><span style="color: #800000;"><span style="font-family: Arial; line-height: 20px;">google宣称要退��Z��国，所证明的，恰恰不是市面上的那些g�_�所宣称的那��P��google是个人权斗士�Q�而刚好反了过来，正好证明google是个市侩分子�?/span><br />
</span></div>
<div><span style="color: #800000;"><span style="font-family: Arial; line-height: 20px;">google
的首席法律顾问的调调让我感到恶心。因�l�济利益退出，���q��白白的说好了�Q�把自己涂脂抹粉一番，�q�煞有介事的提到google被中国�h��d���Q�中国异议分子的
Gmail信箱被攻击，把这些事情作为退��Z��国的铺垫�Q�这�U�论调是侮��i中国普通老百姓的智商�Q�但�q�真有可能迎合那帮目�I�Z��切，但从未到�q�中国、对中国没有
丝毫了解�Q�却又喜�Ƣ对中国说三道四的西方�h的假惟�?br style="line-height: normal;" />
<br style="line-height: normal;" />
只提一个假设，如果��h��占据了中�?0%的搜索市��Z��额，google的高���，�q�会�q�么高调的宣�U�要do no evil�Q�从中国退出吗�Q?br style="line-height: normal;" />
<br style="line-height: normal;" />
整个事情�l�我的唯一感受�Q�就是恶心�?br style="line-height: normal;" />
———�?#8211;<br style="line-height: normal;" />
<span style="font-family: Verdana,Arial,Helvetica,sans-serif; line-height: normal;"><span style="font-family: Arial; line-height: 20px;">以上是作��Z��个曾�l�的忠实google用户而说的，和百度无兟뀂市面上沾沾自喜于了解一点google的��品技术细节将google奉�ؓ道�d��h��而自���G�_�的兄弟�Q�请勿跟帖瞎��P��你们�Ҏ��不懂什么叫搜烦引擎�Q�什么叫自由人权�?/span></span></span><span style="font-family: Arial; line-height: 20px;"><span style="font-family: Verdana,Arial,Helvetica,sans-serif; line-height: normal;"></span></span></span><span style="font-family: Arial; line-height: 20px;"><span style="font-family: Verdana,Arial,Helvetica,sans-serif; line-height: normal;"><span style="font-family: Arial; line-height: 20px;"><span style="color: red;"><br />
</span></span></span></span><br />
<span style="color: red; font-family: Arial;"><span id="wmqeeuq"    class="Apple-style-span" style="line-height: 20px;">立此存照的原因在于，原帖&nbsp;<a >http://news.csdn.net/a/20100113/216459.html</a> 被百度的�����求删掉，所以本着对历史负责的态度�Q�保存与此，�Ƣ迎转帖�?/span></span></div>
<img src ="http://www.aygfsteel.com/RongHao/aggbug/309438.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/RongHao/" target="_blank">ronghao</a> 2010-01-14 13:29 <a href="http://www.aygfsteel.com/RongHao/archive/2010/01/14/309438.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>java的classload机制�Q�－Tomcat 5</title><link>http://www.aygfsteel.com/RongHao/archive/2006/03/01/33030.html</link><dc:creator>ronghao</dc:creator><author>ronghao</author><pubDate>Wed, 01 Mar 2006 08:55:00 GMT</pubDate><guid>http://www.aygfsteel.com/RongHao/archive/2006/03/01/33030.html</guid><wfw:comment>http://www.aygfsteel.com/RongHao/comments/33030.html</wfw:comment><comments>http://www.aygfsteel.com/RongHao/archive/2006/03/01/33030.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/RongHao/comments/commentRss/33030.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/RongHao/services/trackbacks/33030.html</trackback:ping><description><![CDATA[Tomcat是接触最久的应用服务器，同时也被它的classloading愚弄�q�好多次。印象中比较��q��一�ơ是建立了一个web应用�Q���用oracle数据库，我把oracle的jdbc driver攑ֈ�了WEB-INF/lib目录下面�Q�然后给Tomcat配置了数据源�Q�在�q�个应用里面�q�接�q�个数据源，来访问数据库。看��h��一切正常，可是一启动Tomcat�Q�就报出一个错误，说是找不到driver�c�R��后来知道这是由于Tomcat的classloading机制造成的。�ȝ��来说�Q�Tomcat开源、简单，文档清楚�Q�又学习�q�一阵它的源码，是我了解最多的应用服务器了�Q�所以就从它开始�?
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<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;�q�行Tomcat���是�q�行org.apache.catalina.startup.Bootstrap�cȝ��main�Ҏ���Q�和�q�行普通的应用�E�序�q�无二致�Q�所以Java 2的classloading机制适用于这个过�E�。但是Bootstrap�q�行��h��以后�Q�会加蝲common、server下面的类�Q�加载webapps下面的web应用。这些类的加载是�׃��同的classloader来完成的。Tomcat的classloader�l�构如下�Q?BR>
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<P><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">BootStrap classloader(</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">加蝲</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">JRE/lib</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">下的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">rt.jar</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">和其他重�?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">jar</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">文�g</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">)</FONT></SPAN></P></TD></TR></TBODY></TABLE></P>
<P><FONT face="Times New Roman"></FONT><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman"><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Wingdings"><SPAN><FONT face=Wingdings>é</FONT></SPAN></SPAN></SPAN></FONT></SPAN></P>
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<P><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">ExtClassLoader (</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">加蝲</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">JRE/lib/ext</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">下的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">jar</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">文�g�Q?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Java</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">扩展框架使用</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">)</FONT></SPAN></P></TD></TR></TBODY></TABLE></P>
<P><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman"><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Wingdings"><SPAN><FONT face=Wingdings>é</FONT></SPAN></SPAN></SPAN></FONT></SPAN></P>
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<P><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">AppClassLoader ($CATALINA_HOME/bin/</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">bootstrap.jar</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q?/SPAN><SPAN style="FONT-SIZE: 9pt"><FONT face="Times New Roman"> <I><SPAN lang=EN-US>commons-logging -api.jar</SPAN></I></FONT></SPAN><I><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q?/SPAN></I><I><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">commons-daemon.jar</FONT></SPAN></I><I><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q?/SPAN></I><I><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">$JAVA_HOME/lib/tools.jar</FONT></SPAN></I><I><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q?/SPAN></I><FONT face="Times New Roman"><I><SPAN lang=EN-US style="FONT-SIZE: 9pt">jmx.jar</SPAN></I><SPAN lang=EN-US style="FONT-SIZE: 9pt">)</SPAN></FONT></P></TD></TR></TBODY></TABLE></P>
<P><SPAN lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN></FONT></FONT></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Wingdings"><SPAN><FONT face=Wingdings>é</FONT></SPAN></SPAN></P>
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<P><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">common (</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">加蝲</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">$CATALINA_HOME/common/</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Tomcat</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">本��n�?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Web App</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�׃�n�c?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">)</FONT></SPAN></P></TD></TR></TBODY></TABLE></P>
<P><SPAN lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></FONT></FONT></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Wingdings"><SPAN><FONT face=Wingdings>é</FONT></SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><SPAN><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Wingdings"><SPAN><FONT face=Wingdings>é</FONT></SPAN></SPAN></P>
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<P><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Catalina (</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">加蝲</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">$CATALINA_HOME /server/</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Tomcat</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">本��n使用的类</SPAN><FONT face="Times New Roman"><SPAN lang=EN-US style="FONT-SIZE: 9pt">)</SPAN><SPAN lang=EN-US></SPAN></FONT></P></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; BORDER-TOP: windowtext 1pt solid; BORDER-LEFT: #d4d0c8; WIDTH: 162pt; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 18.25pt; BACKGROUND-COLOR: transparent" vAlign=top width=216>
<P><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Shared (</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">加蝲</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">$CATALINA_BASE /shared/</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q�所�?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Web App</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�׃�n�c?/SPAN><FONT face="Times New Roman"><SPAN lang=EN-US style="FONT-SIZE: 9pt">)</SPAN><SPAN lang=EN-US></SPAN></FONT></P></TD></TR></TBODY></TABLE></P>
<P><SPAN lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN>&nbsp;</SPAN><SPAN>&nbsp;</SPAN><SPAN>&nbsp;</SPAN><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN>&nbsp;</SPAN><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN>&nbsp;</SPAN></FONT></FONT></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: Wingdings"><SPAN><FONT face=Wingdings>é</FONT></SPAN></SPAN></P>
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<P><FONT face="Times New Roman"><SPAN lang=EN-US><FONT size=1>WebappClassLoader</FONT></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"> (</SPAN></FONT><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">加蝲各个</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Web App</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�?/SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">class</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">�Q�不同的</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">Web App</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体">被隔���d��</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">)</FONT></SPAN></P></TD></TR></TBODY></TABLE></FONT></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman"><BR></P>
<DIV><FONT size=3>Tomcat在启动的时候，完全忽略了class path的设�|�，而重新设�|�了class path�Q�所�?SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">AppClassLoader </FONT></SPAN>载入的类���不是class path讄���的类�?/FONT></DIV>
<DIV><FONT size=3></FONT>&nbsp;</DIV>
<DIV><FONT size=3>Tomcat没有完全使用Java 2的parent delegation模型。这一点体现在<SPAN lang=EN-US>WebappClassLoader上。在一个web app中，载入�cȝ���q�程是这��L���Q?/SPAN></FONT></DIV>
<DIV><SPAN lang=EN-US><FONT size=3></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN lang=EN-US><FONT size=3>首先���查本地的<SPAN lang=EN-US>WebappClassLoader�Q�如果没有，</SPAN></FONT></SPAN></DIV>
<DIV><SPAN lang=EN-US><SPAN lang=EN-US><FONT size=3>则请求它的父ClassLoader�Q�即shared�?/FONT></SPAN></SPAN></DIV>
<DIV><SPAN lang=EN-US><FONT size=3>从shared开始，采用parent delegation�Q�即shared��h��它的父classloader common来蝲入类�Q�这个过�E�一直�g�l�到<SPAN lang=EN-US style="FONT-SIZE: 9pt"><FONT face="Times New Roman">BootStrap classloader�?/FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN lang=EN-US><FONT face="Times New Roman" size=3><SPAN lang=EN-US style="FONT-SIZE: 9pt"></SPAN></FONT></SPAN>&nbsp;</DIV><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN lang=EN-US style="FONT-SIZE: 9pt">
<DIV><BR><FONT size=3>正是因�ؓ�q�种机制�Q���我们在两个Web app中有相同的class的时候，不会�怺��q�扰。比如说�Q�两个app中都使用了log4j�Q�在WEB-INF/lib下面分别有一份log4j.jar�Q�配�|�输出到不同的文件。因为WebappClassLoader仅对本app可见�Q�所以log4j可以独立工作�Q�而不�怺�影响。但是，如果我们把这两个app下面的log4j.jar�U�d��到shared目录或者common目录�Q�那他们��׃��把日志输出到同样的文件了�Q�因�����时候是�׃�n的�?/FONT></DIV>
<DIV><FONT size=3></FONT>&nbsp;</DIV>
<DIV><FONT size=3>记得当时看到WebappClassLoader的这个特性，心下暗喜�Q�盘���着自己能不能写一个java.lang.String�c�，攑ֈ�WEB-INF/lib下面�Q�而得��C��先加载的��Z��呢？马上兴冲冲地�q�行试验�Q�但是结果让我失望，���d��tomcat的源码一看，发现以java.�Q�javax.�Q�sun.�Q�开头的class�Q�WebappClassLoader一概不予理会，直接把烫��p��扔给它的父loader了。另外，Tomcat文档交待�Q�遇到加载org.xml.sax.* �Q�org.w3c.dom.* �Q�org.apache.xerces.* �Q�org.apache.xalan.* �q�些包的class的请求，WebappClassLoader也不会受理�?BR></FONT></SPAN></FONT></SPAN><BR>引用地址�Q?/DIV>
<DIV><A >http://spaces.msn.com/myj1024/blog/&nbsp; </A><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></DIV></DIV><img src ="http://www.aygfsteel.com/RongHao/aggbug/33030.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/RongHao/" target="_blank">ronghao</a> 2006-03-01 16:55 <a href="http://www.aygfsteel.com/RongHao/archive/2006/03/01/33030.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>在JR BLOG上的留言</title><link>http://www.aygfsteel.com/RongHao/archive/2005/12/06/22754.html</link><dc:creator>ronghao</dc:creator><author>ronghao</author><pubDate>Tue, 06 Dec 2005 10:37:00 GMT</pubDate><guid>http://www.aygfsteel.com/RongHao/archive/2005/12/06/22754.html</guid><wfw:comment>http://www.aygfsteel.com/RongHao/comments/22754.html</wfw:comment><comments>http://www.aygfsteel.com/RongHao/archive/2005/12/06/22754.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.aygfsteel.com/RongHao/comments/commentRss/22754.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/RongHao/services/trackbacks/22754.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 看到你的博客�Q�感触很多．我也有群�E�序员朋友，特别是做了几�q�后也在考虑自己以后的职业发展方向与规划问题�Q�理论大安���知道�Q�可是实际操作中�Q�却不是那么单纯与容易的�Q?<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 我想��C��下面的一个故事及一���对�E�序员职业生涯规划的一文章�Q�与你分享： <BR>　&nbsp;&nbsp;&nbsp; 偶然在网上看到这样一个故事：John和Bill一起到�׃��探险�Q�忽然他们发��C��只老虎正深情的望着他们�Q�John撒腿���p��跑，Bill却迅速的从背包里拿出一双跑鞋穿在脚上，John看到后气急��|坏的对说Bill“你�I�什么鞋也跑不过老虎的”Bill同情的看了他一��|��回答说“我�q�吗要和老虎比，我只要跑�q�你���够了。�?<BR><BR>　　大笑以后不免惌��vJohn的境遇是不是有点象中国的�E�序员呢�Q�我个�h习惯把��Y件从业�h员分为初�U�程序员、高�U�程序员、系�l�分析员和项目经理四大类的方法，我把优秀�E�序员的标准分�ؓ职业习惯和个�����力两斚w���Q�职业习惯包括文档编写习惯，规范化、标准化的编码习惯、��Y件测试习惯、模块化开发习惯等�Q�个�����力包括团队协作能力、需求理解能力、学习和创新能力�{�。我接触�q�的几百个程序员后的感觉�Q�除非那�U�天生适合�~�程的�h才能成�ؓ行业的顶���高手，按照以上标准�l�大多数�E�序员只能归入“��^庸”之列，所以我们这里的讨论主要是基于大多数“��^庸”的�E�序员的�?<BR><BR>　　故事中的John能不能活命跟三个问题有关�Q�老虎、Bill、自己，中国�E�序员的困境也来自三个方面�?<BR><BR>　　困境之一�Q�老虎的威胁。程序员要面对的饿老虎实在不少�Q�比如说老板�Q�好象老板���是�E�序员的天敌�Q�当然自己当老板的程序员除外�Q�呵呵）�Q�什么“不懂技术却指手画脚”、什么“得��C��付出不相当”似乎是�E�序员最常见的牢骚，�q�个问题不可能得到真正的解决�Q�在�q�里��׃��详细讨论了�?<BR><BR>　　困境之二�Q�Bill的竞争。一般说来中国的�E�序员大都是吃“青春饭”的�Q�大部分�E�序员的黄金时代�?4�?8岁。到�?0岁左叻I��一批又一批年�ȝ��序员会给你带来巨大的竞争压力。首先由于��Y件行业的飞速发展，很多自己以前学的东西逐渐升��换代�Q�而许多程序员�׃��长期于工作，学习新知识的效率必然下降。其�ơ自己干了几�q�_��薪水要求自然���高了，而年�ȝ��序员工资又低、干�z�d��快，当然会成�����板的首选；�W�三�Q?0岁基本都已经成家了，要支撑家庭的生活负担�Q�你几乎�q�从头在来的勇气都不会有了。中国的老话说“长江后���催前浪、一代新人换旧�h”，�q�个历史的规律在软�g开发行业体现的���其明显和残��P��很多�E�序员必然要面对的结果就是降薪乃臛_��业�?<BR><BR>　　困境之三�Q�自我的实力。我们都知道人最难战胜的是自己，所以自我也���是�E�序员需要超���的最大障���。大多程序员都把�pȝ��分析员和��目�l�理作�ؓ自己的职业目标，但这些目标的达成�Q�需要个人素质、市场机遇等多个斚w��的条�Ӟ��太多的程序员���是在高不成、低不就的状态中�y�跎了岁月。对于系�l�分析员�Q�特别需要以下几斚w��的素质：客户需求分析能力、系�l�架构与设计能力、模块分解设计能力、项目流�E�控制能力、项目风险评估能力等�Q�而对于项目经理则更注重项目管理方面的能力如团队组�l�能力、沟通协调能力、分析问题解决问题的能力以及良好的职业道��L���Q�而这些素质和能力往往只能依靠�E�序员个人的学习和努力。看到越来越多的�E�序员开始学习项目管理的评����Q�真的有点�ؓ他们担心�Q�因为现在的��目���理培训只能停留在理论和考证的程度，既没有素质方面的训练�Q�又�~�少实际软�g开发项目的案例�Q�学习的�l�果�q�远不能辑ֈ�预期的效果�?img src ="http://www.aygfsteel.com/RongHao/aggbug/22754.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/RongHao/" target="_blank">ronghao</a> 2005-12-06 18:37 <a href="http://www.aygfsteel.com/RongHao/archive/2005/12/06/22754.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>如何娶到比尔·盖茨的女�?/title><link>http://www.aygfsteel.com/RongHao/archive/2005/11/29/21819.html</link><dc:creator>ronghao</dc:creator><author>ronghao</author><pubDate>Tue, 29 Nov 2005 05:22:00 GMT</pubDate><guid>http://www.aygfsteel.com/RongHao/archive/2005/11/29/21819.html</guid><wfw:comment>http://www.aygfsteel.com/RongHao/comments/21819.html</wfw:comment><comments>http://www.aygfsteel.com/RongHao/archive/2005/11/29/21819.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/RongHao/comments/commentRss/21819.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/RongHao/services/trackbacks/21819.html</trackback:ping><description><![CDATA[<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 一位优�U�的商人杰克，有一天告诉他的儿�?BR>　　杰克�Q�我已经军_��好了一个女孩子�Q�我要你娶她<BR>　　儿子�Q�我自己要娶的新娘我自己会决�?BR>　　杰克�Q�但我说的这奛_��可是比尔·盖茨的女儿喔<BR>　　儿子�Q�哇�Q�那�q�样的话…�?/P>
<P><BR>　　在一个聚会中�Q�杰克走向比�����L���?BR>　　杰克�Q�我来帮你女儿介�l�个好丈�?BR>　　比尔�Q�我奛_���q�没惛_��人呢<BR>　　杰克�Q�但我说的这�q�轻人可是世界银行的副总裁�?BR>　　比尔�Q�哇�Q�那�q�样的话…�?/P>
<P><BR>　　接着�Q�杰克去见世界银行总裁<BR>　　杰克�Q�我想介�l�一位年��M�h来当贵行的副总裁<BR>　　总裁�Q�我们已�l�有很多位副总裁�Q�够多了<BR>　　杰克�Q�但我说的这�q�轻人可是比�����L��茨的奛_���?BR>　　总裁�Q�哇�Q�那�q�样的话…�?/P>
<P><BR>　　最后，杰克的儿子娶了比��?盖茨的女儿，又当上世界银行的副总裁</P>
<P><BR>　　知道吗，生意通常都是�q�样谈成�?</P><img src ="http://www.aygfsteel.com/RongHao/aggbug/21819.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/RongHao/" target="_blank">ronghao</a> 2005-11-29 13:22 <a href="http://www.aygfsteel.com/RongHao/archive/2005/11/29/21819.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>                                                             <footer>
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