购物车核心代码

购物车关键代码，供自己查阅

/*

     * 添加到购物车

     * */

    public String addToCart(){

//-------------------------------------

        Map session = ActionContext.getContext().getSession();

        if(session.get("cart")==null){

            List<Book> cart = new ArrayList<Book>();

            session.put("cart",cart);

        }
Book b = bookService.queryById(bookId, false);

            b.setBookId(bookId);

        // 标记添加的商品是否是同一件商品

        boolean same = false;

        List<Book> cart = (List<Book>) session.get("cart");

        if(cart.size()==0){

            b.setCount(b.getCount() + 1);

            cart.add(b);

        }else{

            for (Book bo : cart) {

                if(bo.getBookId() == this.getBookId()){

                    // 购买相同的商品，更新数量

                    bo.setCount(bo.getCount() + 1);

                    same = true;

                }

            }

            if(!same){

                Book b2 = bookService.queryById(bookId, false);

                b2.setCount(b2.getCount() + 1);

                cart.add(b2);

            }

            session.put("cart", cart);

        }

        return "addToCart_success";

    }

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