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You can easily use Velocity templates by adding the following servlet filter to your web.xml file. After that you can start forwarding and redirecting your actions to velocity templates (*.vm files).
Adding the velocity filter to the web.xml:
<!-- Define the velocity filter -->
<filter>
<filter-name>VelocityFilter</filter-name>
<filter-class>
org.mentawai.velocity.VelocityServletFilter
</filter-class>
</filter>
<!-- Map the filter to a file extension -->
<filter-mapping>
<filter-name>VelocityFilter</filter-name>
<url-pattern>*.vm</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
<dispatcher>ERROR</dispatcher>
</filter-mapping>
Using any Menta Tag inside a velocity template:
To call any Menta Tag from inside a velocity template, add the following servlet to your web.xml:
<servlet>
<servlet-name>tags-for-vm</servlet-name>
<servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
<load-on-startup>3</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>tags-for-vm</servlet-name>
<url-pattern>*.vm</url-pattern>
</servlet-mapping>
Now you can mix both velocity directives and menta tags in the same template:
<%@taglib prefix="mtw" uri="http://www.mentaframework.org/tags-mtw/"%>
<!-- example of a hello.vm file -->
<html>
<body>
<!-- mentawai tag -->
<h3>Hello <mtw:out value="username" /> from Mentawai!</h3>
<!-- now velocity -->
<h3>Hello $username with Velocity!</h3>
<!-- do something crazy with velocity -->
#set( $criteria = ["name", "address"] )
#foreach( $criterion in $criteria )
<h1>$criterion</h1>
#end
</body>
</html>
Calling velocity from a JSP file:
You can also invert and use velocity from inside a JSP file. To do that you can use the mtw:velocity tag:
<%@taglib prefix="mtw" uri="http://www.mentaframework.org/tags-mtw/"%>
<!-- example of a hello.jsp file -->
<html>
<body>
<!-- mentawai tag -->
<h3>Hello <mtw:out value="username" /> from Mentawai!</h3>
<!-- now velocity -->
<mtw:velocity>
<h3>Hello $username with Velocity!</h3>
<!-- do something crazy with velocity -->
#set( $criteria = ["name", "address"] )
#foreach( $criterion in $criteria )
<h1>$criterion</h1>
#end
</mtw:velocity>
</body>
</html>