forwardPath+URL?action="done"の条件分岐

URL?action="done"で受け取ればelse if(true)
action次第fowardPathの行き先変更

forwardPath_action.java

String forwardPath = null;
String action = request.getParameter("action");

if(action == null) {
        forwardPath = "/WEB-INF/jsp/registerForm.jsp";              
        }else if(action.equals("done")){
            forwardPath = "/WEB-INF/jsp/registerDone.jsp";
        }
        RequestDispatcher done = request.getRequestDispatcher(forwardPath);
        done.forward(request, response);
    }