groovy script for running jetty server

The following script starts jetty server and opens the folder, specified on command line, for http access (read-only):
Usage:

1. Save this script to file “jetty.groovy”
2. Invoke on command-line:
   groovy jetty.groovy /path/to/some/folder"
3. Enter address in web-browser:
   http://localhost:8080/jetty

Expected result: you see the content of the folder “/path/to/some/folder” in the web-browser.