Example: Session cont...

• Associating Information with a Session

HttpSession session = request.getSession(true); session.putValue("referringPage",request.getHeader("Referer"));

ShoppingCart previousItems = (ShoppingCart)session.getValue("previousItems");

if (previousItems == null) { previousItems = new ShoppingCart(...);

}

String itemID = request.getParameter("itemID"); previousItems.addEntry(Catalog.getEntry(itemID));

// You still have to do putValue, not just modify the cart, since

// the cart may be new and thus not already stored in the session. session.putValue("previousItems", previousItems

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