how to encode url

[Dave]

  For redirecting to a URL
   
  URI: http://www.domain1.com/foo.jsf
  QueryString:  url=http://domain2.com/?q=bar
   
  http://www.domain1.com/foo.jsf?url=http://domain2.com/?q=bar
   
  where url is param name, http://domain2.com/?q=bar is param value.
   
  How to encode the URL?  I tried ExternalContext:
   
  String encodedURL = externalContext.encodeResourceURL(aURL)
   
  but the URL is not changed
   
  Thanks for help
  Dave

       
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