基于MVC用JSP/Servlet实现JPetStore——基本任务1（商品展示业务模块）

àì夳堔傛蜴生んèń 2021-11-09 09:50 224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．商品展示业务模块，包括大类Category、小类Product和具体商品Item的展示和搜索功能。

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1.1 大类Category  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70]  
  大类Category先实现Category.jsp进行大类的具体展示，利用jsp中c:foreach语法对每个大类进行展示，具体类的ID利用a标签进行跳转到小类进行查看，接下来实现domain层的Category.java，完成大类的基础设计，接下来实现persistence中的数据库连接层，先写DAO定义所有接口，再写实现的Implement方法，对数据库进行操作；再写一个Category的Service类，可以在Servlet层中调用该类的相关方法进行进一步操作，最后完成ViewCategoryServlet对jsp页面与业务层进行连接跳转。

web.Servlet中的 **ViewCategoryServlet**：

public class ViewCategoryServlet extends HttpServlet { 
        private static final String VIEW_CATEGORY = "/WEB-INF/jsp/catalog/Category.jsp";
        private String categoryId;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            categoryId = request.getParameter("categoryId");
            CatalogService service = new CatalogService();
            Category category = service.getCategory(categoryId);
            List<Product> productList = service.getProductListByCategory(categoryId);
    
            //保存数据
            HttpSession session = request.getSession();
            session.setAttribute("category", category);
            session.setAttribute("productList", productList);
    
            //跳转页面
            request.getRequestDispatcher(VIEW_CATEGORY).forward(request, response);
        }

1.2 小类Product  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 1]  
  小类Product先完善Product.jsp，主要是通过productId对产品类进行信息展示，之后再实现Product.java，接下进行ProductDAOImpl数据库的连接进行编写，最后完成Servlet的编写。

ViewProductServlet代码：

public class ViewProductServlet extends HttpServlet { 
        private static final String VIEW_PRODUCT = "/WEB-INF/jsp/catalog/Product.jsp";
        private String productId;
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            productId = request.getParameter("productId");
            CatalogService service = new CatalogService();
            Product product = service.getProduct(productId);
            List<Item> itemList = service.getItemListByProduct(productId);
    
            HttpSession session = request.getSession();
            session.setAttribute("product", product);
            session.setAttribute("itemList", itemList);
    
            request.getRequestDispatcher(VIEW_PRODUCT).forward(request, response);
        }
    }

1.3 具体商品Item  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 2]  
  用户点击产品后进入查看具体商品，完善Item.jsp，Copy代码模版中的Item.java，实现ItemDAOImpl的具体数据库连接操作，完成最后的Servlet连接。

ViewItemServlet：

public class ViewItemServlet extends HttpServlet { 
        private static final String VIEW_ITEM = "/WEB-INF/jsp/catalog/Item.jsp";
        private String itemId;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            itemId = request.getParameter("itemId");
            CatalogService service = new CatalogService();
            Item item = service.getItem(itemId);
    
            HttpSession session = request.getSession();
            session.setAttribute("item", item);
    
            request.getRequestDispatcher(VIEW_ITEM).forward(request, response);
        }
    }

1.4 搜索功能  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NTY0NTU1_size_16_color_FFFFFF_t_70 3]  
  搜索功能先完善显示的SearchProducts.jsp，接下直接进行SearchProductServlet编写和配置，通过获得输入的关键字再通过CatalogService的方法进行查找并显示。

SearchProductServlet：

public class SearchProductServlet extends HttpServlet { 
        private static final String SEARCH_PRODUCTS = "/WEB-INF/jsp/catalog/SearchProducts.jsp";
    
        private String keyword;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            doGet(request, response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            keyword = request.getParameter("keyword");
            //request.setAttribute("keyword", keyword);
            CatalogService service = new CatalogService();
            List<Product> productList = service.searchProductList(keyword);
    
            //保存数据
            HttpSession session = request.getSession();
            session.setAttribute("keyword", keyword);
            session.setAttribute("productList", productList);
    
            //跳转页面
            request.getRequestDispatcher(SEARCH_PRODUCTS).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