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Maven2的牛刀小试

想把CyclopsGroup.com上所有的项目里的Maven升级到Maven2已经很久了，一直有很多顾虑。比如怎么和现有的AntHill集成， 过去已经发布的包包该怎么办。为了不影响大局，在新的arapaho这个独立，简单项目上，我决定完全抛弃Maven1。 安装maven2很简单，下载maven-2.0.1的包，解压在某处。把bin/mvn在/usr/local/bin下做一个symbolic link就行了。

第一件要做的事儿是吧CyclopsGroup.com网站搬过来。按照其他maven2里项目的模样，我创建了一个名 叫com.cyclopsgroup.arapaho的项目，并在下面创建arapaho-main-site子项目。这个arapaho-main- site是将来存放网站内容的地方。按照maven网站上创建站点的文档， 我只是简单的把xdoc目录考到src/site/目录下，创建site.xml文件，执行mvn site。静态页面很顺利的生成到了target/site下。

现在的问题是我需要把一段googleanalytics的javascript放到每页的头上。文档上没有指出该怎么做但是从代码上看，在site.xml文件里应该可以写<head>标记。


<project>
 <bannerLeft>...
 <body>...
   <head>
     <script src="http://www.google-analytics.com/urchin.js"...
...


很遗憾，mvn site后改动没有任何效果。这是因为当前的maven是2.0.1release，很多包都不是最新的。所以需要下载最近的maven。
svn co http://svn.apache.org/repos/asf/maven/components/trunk， 进入trunk执行./bootstrap.sh， 在maven-core/target下产生最新的maven-2.1-SNAPSHOT-bin。解压到另一个目录，在/usr/local/bin里 重建mvn连接。

再次mvn site还没效果，手工安装最新的插件试一试。 svn co http://svn.apache.org/repos/asf/maven/plugins/trunk， 进入拿到的trunk执行mvn package install。 报错说需要的maven-2.0.2-SNAPSHOT不存在。

原来刚刚做的新的maven是 maven-2.1-SNAPSHOT， 这里插件需要的是2.0.2-SNAPSHOT。 在trunk上最新的maven已经抛开了别的插件走的太远了。果然，在maven/components/branchs里有个maven-2.0.x 分支。把这个分支搞下来：svn co http://svn.apache.org/repos/asf/maven/components/branches/maven-2.0.x 再用./bootstrap.sh做一个maven包，这回是maven-2.0.2-SNAPSHOT-bin。

解压新的包，重建/usr/local/bin/mvn， 再在arapaho-main-site里做mvn site， 得到一些velocity错误，大概是说244行的$item.toUnescapedString()不认识。打开site的velocity模板， 这行偏偏就是我要的东西。


    #if ( $decoration.body.head )
     #foreach( $item in $decoration.body.head.getChildren() )
       #if ( $item.name == "script" )
         $item.toUnescapedString()
       #else
         $item.toString()
       #end
     #end
   #end


$decoration 是何许人士？这些代码已经跑到了maven的doxia子项目里面，大概还是包版本的问题。svn拿到doxia项目，mvn package install， 可问题还没有解决。难道maven-site-plugin一定要求用户用它自己的模板，我想要个简单的都不行吗？不会的。打开这段程序， 从execute方法里可以看出，site插件不仅像maven1一样允许你指定一个自己的velocity template， 还可以在site.xml里指定一个site skin包。

在arapaho大项目里建arapaho-skin-default子项目，内容很简单：

src/main/resource
 + images/some iamges
 + css/site.css
 + META-INF/maven/site.vm(modified)

site.vm里加进去了我想要的javascript，并对页面的格式做了很多修改。给arapaho-skin-default做mvn package install， 修改arapaho-main-site的site.xml

<project>
 <skin>
   <groupId>com.cyclopsgroup.arapaho</groupId>
   <artifactId>arapaho-skin-default</artifactId>
   <version>1.0-SNAPSHOT</version>
 </skin>
 <bannerLeft>...
...

原来的head标签就不用了。

再mvn site， 问题解决。这个arapaho-skin-default将来也可以在别的项目上重用。

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