运用java语言设计购物车的实现.doc

首先，建3个实体类，如下：package entity;/订单类import java.util.Date;public class Order private String orderId;/订单编号private OrderItem items;/订单项private Date date;/订单时间private Float total;/订单总额public Float getTotal() return total;public void setTotal(Float total) this.total = total;public String getOrderId() return orderId;public void setOrderId(String orderId) this.orderId = orderId;public OrderItem getItems() return items;public void setItems(OrderItem items) this.items = items;public Date getDate() return date;public void setDate(Date date) this.date = date;package entity;/订单项,为了方便拓展public class OrderItem private Product product;/商品private Integer number;/购买数量public OrderItem(Product product, Integer number) duct = product;this.number = number;public Product getProduct() return product;public void setProduct(Product product) duct = product;public Integer getNumber() return number;public void setNumber(Integer number) this.number = number;package entity;/产品信息public class Product private String name;private String image;private Integer id;private Float price;public Product(String name, String image, Integer id, Float price) = name;this.image = image;this.id = id;this.price = price;public String getName() return name;public void setName(String name) = name;public String getImage() return image;public void setImage(String image) this.image = image;public Integer getId() return id;public void setId(Integer id) this.id = id;public Float getPrice() return price;public void setPrice(Float price) this.price = price;接下来就是处理了：package util;import java.util.Date;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Set;import javax.servlet.http.HttpSession;import entity.Order;import entity.OrderItem;import entity.Product;public class ShoppingCart public static Product init() Product product = new Product3;Product p1 = new Product(Struts Web, struts.jpg, 1, 80.5F);Product p2 = new Product(Hibernate开发与实践, hibernate.jpg, 2, 60.5F);Product p3 = new Product(Struts Spring Hibernate, spring.jpg, 3, 90.5F);product0 = p1;product1 = p2;product2 = p3;return product;/* * param pId 商品id,商品编号 * return */public Product getProduct(Integer pId)Product product = init();return productpId-1;/* * 加入购物车 * param pId 商品编号 * param number 购买数量 * param session 会话对象 */public void put(Integer pId,Integer number,HttpSession session)Map map = (Map)session.getAttribute(item);/获取session对象if(map=null)/第一次先构造对象map = new HashMap();if(map.get(pId)=null)Product product = getProduct(pId);/产品信息OrderItem orderItem = new OrderItem(product, number);/获取orderItemmap.put(pId, orderItem);System.out.println(宝贝名称： +orderItem.getProduct().getName()+ 宝贝购买数量: +orderItem.getNumber();elseOrderItem orderItem = map.get(pId);/获取orderItemProduct product = orderItem.getProduct();if(product.getId().equals(pId)/同一本书重新购买，需要再加上numberorderItem.setNumber(number+orderItem.getNumber();System.out.println(商品名称： +orderItem.getProduct().getName()+ 购买数量: +orderItem.getNumber();session.setAttribute(item, map);public Order showOrder(HttpSession session)Order order = null;/获取sessionMap map = (Map)session.getAttribute(item);if(map!=null&map.size()0)OrderItem items = new OrderItemmap.size();/构造数组，长度是map的长度Set set = map.keySet();Iterator iterator = set.iterator();/迭代器对象int i = 0;while (iterator.hasNext() Integer key = (Integer) iterator.next();/一个个取出key/*System.out.println(key);*/itemsi = map.get(key);/给orderIte添加元素i+;order = new Order();order.setDate(new Date();/设置时间order.setItems(items);/订单项：产品信息，数量order.setOrderId(01);/编号order.setTotal(total(items);/总价 System.out.println(order.getTotal();return order;public sta