making download option in grails

I am in the training of web developement.I want make a page which shows all the files in the D://downloads directory.I made that part in grails.If i click on the particular file i want download that file.I dont know how to make that part.I did a google search.But i cannot do that.

My code is

 <g:each in="${fileList}" var="filename" status="i">
    ${filename}
   <!-- Codes to make a file downloadable-->
  </g:each>

From stackoverflow BlackPanther

• You just need to set the right headers so that the browser knows its a file that it needs to download. I'm not sure how to do that in grails. http://support.microsoft.com/kb/260519

  From Luca Matteis

• This will help

  From BlackPanther