基于MVC用JSP/Servlet实现JPetStore——基本任务3（订单管理模块）

叁歲伎倆 2021-11-09 10:06 288阅读 0赞

## 基于MVC用JSP/Servlet实现JPetStore ##

CSDN下载：[基于MVC用JSP/Servlet实现JPetStore][MVC_JSP_Servlet_JPetStore]

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1.  订单管理模块，包括购物车管理、新增订单、地址信息等业务功能。

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3.1 添加商品到购物车  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70]

先实现Cart.jsp，能够在网页显示购物车栏目信息，接下来具体实现Cart.java使得用户可以创建Cart类，最后创建AddItemToCartServlet，当用户在浏览商品界面时，点击Add to Cart时可以将该商品加入到购物车中并显示相关信息。

AddItemToCartServlet

public class AddItemToCartServlet extends HttpServlet { 
    
        //Servlet的功能即负责中转
        //1.处理完请求后的跳转页面
        private static final String VIEW_CART = "/WEB-INF/jsp/cart/Cart.jsp";
    
        //2.定义处理该请求所需要的数据
        private String workingItemId;
        private Cart cart;             //购物车
    
        //3.是否需要调用业务逻辑层
        private CatalogService catalogService;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            workingItemId = request.getParameter("workingItemId");
    
            Account account;
            //从对话中，获取购物车
            HttpSession session = request.getSession();
            cart = (Cart)session.getAttribute("cart");
            account = (Account)session.getAttribute("account");
    
            if(cart == null){ 
                //第一次使用购物车
                cart = new Cart();
            }
    
            if(cart.containsItemId(workingItemId)){ 
                //已有该物品，数量加一
                cart.incrementQuantityByItemId(workingItemId);
    
            }else{ 
                catalogService = new CatalogService();
                boolean isInStock = catalogService.isItemInStock(workingItemId);
                Item item = catalogService.getItem(workingItemId);
                cart.addItem(item, isInStock);
                session.setAttribute("cart", cart);
    
                request.getRequestDispatcher(VIEW_CART).forward(request, response);
            }
        }
    }

3.2 更改购物车商品的数量信息  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 2]  
  在购物车的数量栏输入想要更改后的商品数量，点击Update Cart即可更新购物车中的商品数量、总价。点击之后利用UpdateCartQuantitiesServlet实现信息更新以及页面更新，传递商品的数量信息获取后进行相关操作。

UpdateCartQuantitiesServlet：

public class UpdateCartQuantitiesServlet extends HttpServlet { 
    
        private static final String VIEW_CART = "/WEB-INF/jsp/cart/Cart.jsp";
    
        private String workingItemId;
        private Cart cart;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            workingItemId = request.getParameter("workingItemId");
            CatalogService catalogService = new CatalogService();
    
            //从对话中，获取购物车
            HttpSession session = request.getSession();
            cart = (Cart)session.getAttribute("cart");
    
            Iterator<CartItem> cartItemIterator = cart.getAllCartItems();
    
            while (cartItemIterator.hasNext()){ 
                //产品数量增加
                CartItem cartItem = (CartItem)cartItemIterator.next();
                String itemId = cartItem.getItem().getItemId();
    
                try { 
                    int quantity = Integer.parseInt((String) request.getParameter(itemId));
                    cart.setQuantityByItemId(itemId, quantity);
                    if (quantity < 1) { 
                        cartItemIterator.remove();
                    }
                } catch (Exception e) { 
                    //ignore parse exceptions on purpose
                    e.printStackTrace();
                }
    
                //CartItem cartItem = cartItemIterator.next();
                //cartItem.incrementQuantity();
            }
    
            session.setAttribute("cart", cart);
    
            request.getRequestDispatcher(VIEW_CART).forward(request, response);
        }
    }

3.3 移除购物车中的商品  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 4]  
  点击购物车中Remove按钮，获取购物车中的信息，之后进入RemoveItemFromCartServlet进行删除操作，并更新该购物车中的信息，如果误操作，则提示该误操作信息。

RemoveItemFromCartServlet：

public class RemoveItemFromCartServlet extends HttpServlet { 
    
        private static final String VIEW_CART = "/WEB-INF/jsp/cart/Cart.jsp";
        private static final String ERROR = "/WEB-INF/jsp/common/Error.jsp";
    
        private String workingItemId;
        private Cart cart;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            workingItemId = request.getParameter("workingItemId");
    
            HttpSession session = request.getSession();
            cart = (Cart)session.getAttribute("cart");
    
            Item item = cart.removeItemById(workingItemId);
    
            if(item == null) { 
                session.setAttribute("message", "Attempted to remove null CartItem from Cart.");
                request.getRequestDispatcher(ERROR).forward(request, response);
            }else{ 
                request.getRequestDispatcher(VIEW_CART).forward(request, response);
            }
        }
    }

3.4 新增订单——跳转到查看寄件人与收件人地址  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 5]

生成订单界面，包括修改地址信息时共有四个页面，第一个页面是购买方的支付与寄件地址信息确认，即NewOrderForm.jsp，接下来确认后是发货人地址与收货人地址信息确认（ConfirmOrder.jsp），或者点击修改地址即可通过ShippingFormServlet进行跳转到修改收件人地址界面，最后点击Comfirm之后即可生成最终订单（ViewOrder.jsp）。  
  第一个页面在购物车点击Proceed to Checkout之后利用NewOrderFormServlet进行跳转到地址信息显示界面。

NewOrderFormServlet:

public class NewOrderFormServlet extends HttpServlet { 
        private static final String NEW_ORDER = "/WEB-INF/jsp/order/NewOrderForm.jsp";
        private static final String SIGNONFORM = "/WEB-INF/jsp/account/SignonForm.jsp";
        private static final String ERROR = "/WEB-INF/jsp/common/Error.jsp";
    
        private Account account;
        private Order order;
        private Cart cart;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    
            HttpSession session = request.getSession();
            account = (Account)session.getAttribute("account");
            cart = (Cart)session.getAttribute("cart");
    
            if (account == null){ 
                session.setAttribute("message", "You must sign on before attempting to check out. Please sign on and try checking out again.");
                request.getRequestDispatcher(SIGNONFORM).forward(request, response);
            } else if(cart != null){ 
                order = new Order();
                order.initOrder(account, cart);
                session.setAttribute("order", order);
                request.getRequestDispatcher(NEW_ORDER).forward(request, response);
            }else{ 
                session.setAttribute("message", "An order could not be created because a cart could not be found.");
                request.getRequestDispatcher(ERROR).forward(request, response);
            }
        }
    }

3.5 新增订单——地址信息即修改收件人地址  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 6]  
  在生成订单的第一个界面时有个更改地址的选择框，选择之后点击Continue即可利用ShippingFormServlet跳转到更改收件人地址的界面ShippingForm.jsp,接下里可以进行收货人地址信息更改，再利用ShippingAdressServlet进行数据更新存入数据库接下来使用。

ShippingFormServlet：

public class ShippingFormServlet extends HttpServlet { 
        private static final String SHIPPINGFORM = "/WEB-INF/jsp/order/ShippingForm.jsp";
        private static final String SIGNONFORM = "/WEB-INF/jsp/account/SignonForm.jsp";
    
        private Account account;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    
            HttpSession session = request.getSession();
            account = (Account)session.getAttribute("account");
    
            if (account == null){ 
                request.getRequestDispatcher(SIGNONFORM).forward(request, response);
            } else{ 
                request.getRequestDispatcher(SHIPPINGFORM).forward(request, response);
            }
        }
    }

ShippingAdressServlet：

public class ShippingAddressServlet extends HttpServlet { 
        private static final String CONFIRM_ORDER_FORM = "/WEB-INF/jsp/order/ConfirmOrder.jsp";
    
        private Order order;
        private String shipToFirstName;
        private String shipToLastName;
        private String shipAddress1;
        private String shipAddress2;
        private String shipCity;
        private String shipState;
        private String shipZip;
        private String shipCountry;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            shipToFirstName = request.getParameter("shipToFirstName");
            shipToLastName = request.getParameter("shipToLastName");
            shipAddress1 = request.getParameter("shipAddress1");
            shipAddress2 = request.getParameter("shipAddress2");
            shipCity = request.getParameter("shipCity");
            shipState = request.getParameter("shipState");
            shipZip = request.getParameter("shipZip");
            shipCountry = request.getParameter("shipCountry");
    
            HttpSession session = request.getSession();
            order = (Order)session.getAttribute("order");
    
            order.setShipToFirstName(shipToFirstName);
            order.setShipToLastName(shipToLastName);
            order.setShipAddress1(shipAddress1);
            order.setShipAddress2(shipAddress2);
            order.setShipCity(shipCity);
            order.setShipState(shipState);
            order.setShipZip(shipZip);
            order.setCourier(shipCountry);
    
            session.setAttribute("order", order);
    
            Account account = (Account)session.getAttribute("account");
    
            request.getRequestDispatcher(CONFIRM_ORDER_FORM).forward(request, response);
        }
    }

3.6 新增订单——确定订单信息  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 7]  
  在第一个地址页面后点击Continue进入第二个地址查看界面（ConfirmOrderFormServlet），确认订单信息的正误。

public class ConfirmOrderFormServlet extends HttpServlet { 
        private static final String CONFIRM_ORDER_FORM = "/WEB-INF/jsp/order/ConfirmOrder.jsp";
        private static final String SHIPPINGFORM = "/WEB-INF/jsp/order/ShippingForm.jsp";
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            shippingAddressRequired = request.getParameter("shippingAddressRequired");
            order = new Order();
    
            HttpSession session = request.getSession();
            order = (Order)session.getAttribute("order");
            Account account = (Account)session.getAttribute("account");
    
            if (shippingAddressRequired == null){ 
    request.getRequestDispatcher(CONFIRM_ORDER_FORM).forward(request, response);
            }
            else{ 
                shippingAddressRequired = null;
                request.getRequestDispatcher(SHIPPINGFORM).forward(request, response);
            }
        }
    }

3.7 新增订单——生成最终订单  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 8]

最终即可通过ViewOrderServlet生成最终的订单，包含地址信息、商品清单等信息。

ViewOrderServlet：

public class ViewOrderServlet extends HttpServlet { 
        private static final String VIEWORDER = "/WEB-INF/jsp/order/ViewOrder.jsp";
        private static final String ERROR = "/WEB-INF/jsp/common/Error.jsp";
    
        private Order order;
        private OrderService orderService;
        private Cart cart;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    
            HttpSession session = request.getSession();
            order = (Order) session.getAttribute("order");
            cart = (Cart) session.getAttribute("cart");
    
            if (order != null) { 
                orderService = new OrderService();
                orderService.insertOrder(order);
                session.setAttribute("order", order);
                //清空购物车
                cart = null;
                session.setAttribute("cart", cart);
    
                session.setAttribute("message", "Thank you, your order has been submitted.");
                request.getRequestDispatcher(VIEWORDER).forward(request, response);
            } else { 
                session.setAttribute("message", "An error occurred processing your order (order was null).");
                request.getRequestDispatcher(ERROR).forward(request, response);
            }
        }
    }

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完整项目文档及源码请参考：[实验一 基于MVC用JSPServlet实现JPetStore][_MVC_JSPServlet_JPetStore]

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[MVC_JSP_Servlet_JPetStore]: https://download.csdn.net/download/qq_39564555/11465159
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[_MVC_JSPServlet_JPetStore]: https://github.com/zz2summer/JavaWeb-Application-Developing-Technology/tree/master/%E5%AE%9E%E9%AA%8C%E7%9B%B8%E5%85%B3/%E5%AE%9E%E9%AA%8C%E4%B8%80%20%20%E5%9F%BA%E4%BA%8EMVC%E7%94%A8JSPServlet%E5%AE%9E%E7%8E%B0JPetStore