Share a practical online shopping mall-shopping module and order module

Today’s Task

• Complete the functions of the shopping module

• Complete the functions of the order module

1.1 Shopping module:

1.1.1 Function demonstration:

Product details:

Shopping cart module ：

1.1.2 Code implementation:

1. Click the [Add to Cart] link on the product details page and .

2. Submit to the Servlet:

* Submit the quantity of the purchased product.

* Submit the ID of the purchased product.

3. Store the shopping information into the session.

* Store the shopping cart information into the session.

* Encapsulation of the shopping item object (each purchased item in the shopping cart Information)

* Product object:

* Quantity

* Subtotal

* Encapsulation of the shopping cart object (information about purchasing all products)

* Collection of shopping items

* Total

4. Get the shopping cart information on the page.

* Display it on the page.

【Shopping cart entity encapsulation: CartItem】

public class CartItem {private Product product;// 购买的商品的信息private int count; // 购买的数量private double subtotal; // 购买商品的小计

   public Product getProduct() {return product;

    }public void setProduct(Product product) {this.product = product;

    }public int getCount() {return count;

    }public void setCount(int count) {this.count = count;

    }public double getSubtotal() {return count * product.getShop_price();

    }/*public void setSubtotal(double subtotal) {

        this.subtotal = subtotal;

    }*/}

【Shopping cart entity: Cart】

public class Cart {// 定义一个购物项的集合的属性:集合采用Map集合,因为移除购物项的时候方便.使用商品的id作为Map的key// 使用购物项作为Map的value.private Map<String,CartItem> map = new LinkedHashMap<String,CartItem>();// 定义购物车中的总计:private double total;   public Map<String, CartItem> getMap() {return map;

    }   public double getTotal() {return total;

    }   // 方法：将购物项添加到购物车public void addCart(CartItem cartItem){// 判断购物车中是否已经存在该购物项.String id = cartItem.getProduct().getPid();if(map.containsKey(id)){// 如果已经存在:在原来的数量的基础上+新买的数量. 总计发生变化.// 获得购物车中的原来购物项的信息CartItem _cartItem = map.get(id);

            _cartItem.setCount(_cartItem.getCount()+cartItem.getCount());

        }else{// 如果不存在:在集合中添加一个新的购物项. 总计发生变化.map.put(id, cartItem);

        }

       

        total += cartItem.getSubtotal();

       

    }   // 方法：从购物车中移除购物项public void removeCart(String id){// 从map中移除选中的元素.// CartItem cartItem = map.get(id);CartItem cartItem = map.remove(id);// 将总计 - 移除购物项的小计total -= cartItem.getSubtotal();

       

    }   // 方法：清空购物车public void clearCart(){ ////  将map集合清空.map.clear();// 将总结设置为0.total = 0;

    }

}

[Click the link to add to cart on the shopping details page]

public String addCart(HttpServletRequest req,HttpServletResponse resp){// 接收参数:String pid = req.getParameter("pid");int count = Integer.parseInt(req.getParameter("count"));       try {// 封装购物项:CartItem cartItem = new CartItem();// 商品对象:通过商品ID查询商品.ProductService productService = (ProductService) BeanFactory.getBean("productService");

            Product product = productService.findById(pid);

            cartItem.setProduct(product);

            cartItem.setCount(count);// 调用购物车中的添加到购物车的方法：// Cart cart = new Cart();Cart cart = getCart(req);

            cart.addCart(cartItem);

           

            resp.sendRedirect(req.getContextPath()+"/jsp/cart.jsp");

        } catch (Exception e) {

            e.printStackTrace();throw new RuntimeException();

        }return null;

    }

【Click to clear the shopping cart on the shopping cart page】

    public String clearCart(HttpServletRequest req,HttpServletResponse resp){// 获得购物车对象.Cart cart = getCart(req);// 调用购物车中的方法:cart.clearCart();try {

            resp.sendRedirect(req.getContextPath()+"/jsp/cart.jsp");

        } catch (Exception e) {

            e.printStackTrace();throw new RuntimeException();

        }return null;

    }

【In the shopping cart Click the delete link on the page]

public String removeCart(HttpServletRequest req,HttpServletResponse resp){try {// 接收参数：String pid = req.getParameter("pid");// 获得购物车：Cart cart = getCart(req);

            cart.removeCart(pid);// 页面跳转resp.sendRedirect(req.getContextPath()+"/jsp/cart.jsp");

        } catch (Exception e) {

            e.printStackTrace();throw new RuntimeException();

        }return null;

    }

1.2 Order module:

1.2.1 Function demonstration:

1.2.2 Code implementation:

1.2.2.1 Create tables and entities:

CREATE TABLE `orders` (

  `oid` varchar(32) NOT NULL,

  `ordertime` datetime DEFAULT NULL,

  `total` double DEFAULT NULL,

  `state` int(11) DEFAULT NULL,

  `address` varchar(30) DEFAULT NULL,

  `name` varchar(20) DEFAULT NULL,

  `telephone` varchar(20) DEFAULT NULL,

  `uid` varchar(32) DEFAULT NULL,  PRIMARY KEY (`oid`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

CREATE TABLE `orderitem` (

  `itemid` varchar(32) NOT NULL,

  `count` int(11) DEFAULT NULL,

  `subtotal` double DEFAULT NULL,

  `pid` varchar(32) DEFAULT NULL,

  `oid` varchar(32) DEFAULT NULL,  PRIMARY KEY (`itemid`),  KEY `fk_0001` (`pid`),  KEY `fk_0002` (`oid`),  CONSTRAINT `fk_0001` FOREIGN KEY (`pid`) REFERENCES `product` (`pid`),  CONSTRAINT `fk_0002` FOREIGN KEY (`oid`) REFERENCES `orders` (`oid`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

1.2.2.2 Generate order:

[Click on the shopping cart page to submit the order]

Submit to Servlet:

* Encapsulate orders and line items.

* Call the business layer

* Clear the shopping cart

* Page jump

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