Velocity notes--the problem of using velocity to get dynamic Web project names

Before using JSP development, you can easily get to the root project name through request, now change to use velocity rendering view, because it is not dependent on the environment of some classes such as Servlet,request, and the Web project's root project name is not written dead, need to get dynamically, At this time what to do, tried the online said a lot of ways, summed up the experience.

The first type: (failure)

Configure the following information in the Toolbox.xml:

<toolbox scope= "Request" >
<tool key= "link" class= "Org.apache.velocity.tools.view.LinkTool"/>
</toolbox>

Then directly reference $link.contextpath in the. vm

I follow this way to configure the completion, start the browser to open the project, the page can not be brushed out, according to the truth if it can not read LinkTool, it should be directly output $link.contextpath in the page, and then I removed the VM in the $ Link.contextpath, re-deployment can be brushed out of the page, I guess I might be reading the Toolbox.xml class when the problem, and then in Toolbox.xml to add a self-written tool class test:

<Tool>        <Key>Myutil</Key>        <class>Com.ximalaya.shop.api.util.MyUtil</class>        <Scope>Application</Scope>    </Tool>

The Myutil class has one of the simplest static methods GetMessage (), returns "test", and then I use $myutil.message in the VM to test. Browser page successfully returned test ... It seems not to read toolbox.xml problem, debug a bit can really go into the LinkTool method, but the value is always empty, tinker for a long time no solution, the first method, failure!

Second type: (Success)

Add a parameter where the spring configuration file is viewresolver:

 <!--Configuration Attempt Parser -    <BeanID= "Viewresolver"class= "Org.springframework.web.servlet.view.velocity.VelocityViewResolver">        < Propertyname= "Cache"value= "false"/>        < Propertyname= "prefix"value=""/>        < Propertyname= "suffix"value= ". VM"/>         < property name= "Requestcontextattribute"  value= "RC"/>         < Propertyname= "ContentType"value= "Text/html;charset=utf-8"/>        < Propertyname= "Toolboxconfiglocation"value= "/web-inf/toolbox.xml"/>        < Propertyname= "Exposespringmacrohelpers"value= "true"/>        < Propertyname= "Exposerequestattributes"value= "true"/>        < Propertyname= "Exposesessionattributes"value= "true"/>        < Propertyname= "Allowsessionoverride"value= "true"/>        < Propertyname= "Allowrequestoverride"value= "true"/>    </Bean>

In the VM file, use $rc.contextpath directly to get the project name.

"Requestcontextattribute" exposes spring's RequestContext objects as variable RC. Use $rc.contextpath to get the application's ContextPath (that is,/myusers) and read user.name with ${rc.getmessage ("/web-inf/classes/")} Messages.properties localization information. This object is essential for view technologies that do not access Serlvet requests (that is, the velocity and freemarker templates).

Velocity notes--the problem of using velocity to get dynamic Web project names