Top Most Find whether a parameter exists in the request object

boolean hasFoo = !(request.getParameter("foo") == null || request.getParameter("foo").equals(""));

Tom Paris adds:

boolean hasParameter = request.getParameterMap().contains(theParameter);

(which works in Servlet 2.3+)

It seems like the right code would be:

boolean containsKey = request.getParameterMap().containsKey(param);

It would also be possible to ask for a value of the supplied key(param) using

boolean containsKey = request.getParameterMap().containsValue(param);