@RequestMapping("/additem.do")
public ModelAndView addItem() {
service.addItem();
ShoppingCart cart = service.getShoppingCart();
return new ModelAndView("/viewcart", SHOPPING_CART_KEY, cart);
}
@RequestMapping("/viewcart.do")
public ModelMap viewCart() {
return new ModelMap(SHOPPING_CART_KEY, service.getShoppingCart());
}