怎么引用有状态会话bean呢

关键是为每个bean建一个句柄，以后就可以引用，做购物车的时候可以用这个方法，也可以用到动态代理。  if (cartHandle == null)            {
                System.out.println("3");
                Context ctx = getInitialContext();
                Object obj = ctx.lookup("Cart");
                CartHome cartHome = (CartHome) javax.rmi.PortableRemoteObject.
                                    narrow(obj, CartHome.class);<
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                CustomerDto cusDto=null;
                cusDto=(CustomerDto)mysession.getAttribute("userDto");
                Cart cart = cartHome.create(cusDto);
                cartHandle = cart.getHandle();//得到有状态会话bean的HANDLE通过HANDLE来调用这个会话bean。
                cart.addItem(item);
                HttpSession session = servletRequest.getSession(true);
                session.setAttribute("cartHandle", cartHandle);
                //只创建一次，因为上面的HANDLE
               // saveToken(servletRequest);//利用同步令牌解决同步提交问题

                 Map map = cart.getDetail();
                Collection collection = map.values();
                iterator = collection.iterator();
                list.clear();
                while (iterator.hasNext())
                {
                    ItemValue _item = (ItemValue) iterator.next();
                    list.add(_item);
                }
                double ret=cart.getTotal();
                mysession.setAttribute("totalPrice",new Double(ret));//在客户端调用
                mysession.setAttribute("shoppinglist", list);
            }