As promised, this time I am showing you a very simple way to play with Velocity templating language in JRuby.

jvel.rb

# A simple JRuby Velocity integration demo 
# Notes: 
# - save this script as 'jvel.rb'.
# - in the folder from where you're executing this simple script, you'll
#  have a subfolder: 'lib', containing the Velocity library:
#   lib/velocity-1.6.2-dep.jar
# This jar is intended to be used when you do standalone development
# with Velocity. And assuming that you have jruby in the path, you can 
# run the script:
#
#   $ jruby jvel.rb World
#
# You'll see: Hello World!
# ----------- 

require 'java'   

Dir["lib/*.jar"].each { |jar| require jar }
 
class JRubyVelocity   
    include_class 'java.io.StringWriter'   
    include_class 'org.apache.velocity.app.Velocity'   
    include_class 'org.apache.velocity.VelocityContext'    

  def render ( arg) 
    Velocity.init
    writer = StringWriter.new  
    ctx = VelocityContext.new( {'name' => arg})                      
    Velocity.evaluate( ctx, writer, "log", "Hello ${name}!") 
    return writer.getBuffer
  end
end  

puts JRubyVelocity.new().render( ARGV.pop)  

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Posted by Florin T.PATRASCU on November 6, 2009 12:15:41 EST PM #