試題詳解

 22. String id = request.getParameter("jsessionid");

 23. // insert code here 

 24. String name = (String) session.getAttribute("name")

 Which three can be placed at line 23 to retrieve an existing HttpSession object? (Choose three)
(A) HttpSession session = request.getSession();
(B) HttpSession session = request.getSession(id);
(C) HttpSession session = request.getSession(true);
(D) HttpSession session = request.getSession(false);
(E) HttpSession session = request.getSession("jsessionid");