Complete the functions of the shopping module
Complete the functions of the order module
Product details:
Shopping cart module ：
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;
}
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;
[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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