cookie中用字符串方式存储session信息实现的购物车模块

上传者: hujiya | 上传时间: 2021-06-29 11:10:35 | 文件大小: 1.25MB | 文件类型: ZIP
购物车案例: 基本设计思想: (1)使用session机制,保存用户状态(用户购买的商品)。 (2)为了方便对购买操作的处理(比如,购买商品、 删除已经购买的商品、查看已经购买的商品、计价等等), 设计一个Cart类,封装这些操作。Cart对象会放在Session对象里。 具体的设计: 表:t_computer create table t_computer( id bigint primary key auto_increment, name varchar(50), description varchar(100), pic varchar(255), price double(8,2)); 实体类: Computer dao: ComputerDAO Comuter findById(long id) List findAll() save(Computer computer); ComputerDAOJdbcImpl 测试dao: 购物车的设计: CartItem //商品条目 属性: int qty //购买产品的数量 Computer c //购买的产品是什么 方法: get/set方法 Cart //购物车 属性: List items //存放所有购买的商品 方法: boolean add(CartItem item) //boolean值如果是false,表示 已经购买过该商品。 void delete(long id) //删除某个商品。id是产品的ID号。 void modify(long id,int qty) //修改商品的数量 double sum() //计价 void clear() //清空商品 List list //列出所有商品 页面: cart_list.jsp: 功能:列出所有商品,用户点击链接实现购买。 实现:查询t_computer表(由ShoppingServlet来负责查询) cart.jsp 功能:列出所有已经购买的商品,并且可以修改数量、 删除某个商品、清空购物车、返回到cart_list.jsp。 实现:(ShoppingServlet调用以下方法) 列出所有已经购买的商品: cart.list() 修改数量:cart.modify() 删除:cart.delete() 清空:cart.clear() ShoppingServlet: (1)创建Session: request.getSession(); (2)创建Cart,并且将Cart放到session (3)调用Cart的方法,完成请求;也会调用 ComputerDAO完成数据库操作

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评论信息

  • liuchun009123 :
    可以参考下不是非常好
    2014-04-04
  • lan_zhu_ :
    很有参考价值
    2013-01-01

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