Parsing a URL to see if a param exists

[David Wall]

Is there an API call to parse an URL I have as a String so that I can 
determine if a given param exists? 

I know that when processing from Tomcat, I can do 
request.getParameterValues() for the URL of my servlet, but I'd like to 
know if the URL used to arrive at my page includes a given parameter on 
the URL itself (and not from a POST hidden param that will also be 
returned by getParameterValues).

Thanks,
David
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