SimpleHTTPServer.groovy

@Grab('org.eclipse.jetty:jetty-server:8.1.14.v20131031')
import org.eclipse.jetty.server.Server
import org.eclipse.jetty.server.handler.ContextHandler
import org.eclipse.jetty.server.handler.ResourceHandler
import org.eclipse.jetty.util.resource.FileResource

def handler = new ResourceHandler()
handler.directoriesListed = true
handler.baseResource = new FileResource(new File(args ? args[0] : System.getProperty('user.dir')).canonicalFile.toURL())

def ContextHandler ctx = new ContextHandler('/')
ctx.setHandler(handler)

def server = new Server(8080)
server.setHandler(ctx)
server.start()