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I’ve stored an email address in a cookie, and I’m sending it to a jsp file on google appengine to be verified. The @ is coming through as %40. I need to get it back to an @, and convert any other special chars that might have been encoded. Are there classes available through appengine that deal with this conversion?
Look at URLDecoder and URLEncoder:
http://download.oracle.com/javase/6/docs/api/java/net/URLDecoder.html
Looking at the JRE whitelist they are both fine to use.