一、结合之前所学的相关技术,编写代码实现以下购物车功能
1. 编写一个页面,展现商品列表(静态页面),页面右上方有登陆、结账和查看购物车三个按钮,下方展示网站历史访问的人数
2. 用户点击商品后,可以将商品加入购物车
3. 用户点击登陆,跳转到登陆页面
4. 用户点击结账,若已登陆跳转至结账页面,否则跳转到登陆页面登陆后再跳转到结账页。
5. 用户点击查看购物车按钮,跳转至购物车页面,可查看购物车列表、增加商品数量或者删除商品
1. 我实现的功能运行截图如下
(1)商品列表页面home.jsp
(2)登录账号页面/未登录点击结账页面
(3)重新登录页面(记住上次登录的用户名和密码)
(4)点击任意商品加入购物车之后查看购物车
(5)增加或减少商品
(6)商品数量减为0时移除
(7)点击去结算,展示总金额
2. 数据库test存放的表格
(1)user表
(2)product表
导入jar包
3. 实体类
(1)User
package com.ryx.web.sy7; import lombok.AllArgsConstructor; import lombok.Builder; import lombok.Data; import lombok.NoArgsConstructor; @NoArgsConstructor @AllArgsConstructor @Data @Builder public class User { private String username; private String password; }
(2)Product.java
package com.ryx.web.sy7; import lombok.AllArgsConstructor; import lombok.Builder; import lombok.Data; import lombok.NoArgsConstructor; import java.math.BigDecimal; @Data @Builder @NoArgsConstructor @AllArgsConstructor public class Product { Integer id; String name; String imagePath; BigDecimal price; String description; }
(3)ProductVo
package com.ryx.web.sy7; import lombok.Getter; import lombok.Setter; import java.math.BigDecimal; public class ProductVo extends Product { @Getter @Setter Integer count; //统计数量 public ProductVo(Integer id, Integer count, String name, double price, String imagePath) { super(); this.id = id; this.count = count; this.name = name; this.price = BigDecimal.valueOf(price); this.imagePath=imagePath; } }
4. CartController.java
package com.ryx.web.sy7; import lombok.SneakyThrows; import org.springframework.util.ObjectUtils; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; import java.sql.*; import java.util.HashMap; import java.util.Map; @WebServlet(name = "shoppingCart", value = "/shoppingCart") public class CartController extends HttpServlet { // 连接数据库 private static final String DB_URL = "jdbc:mysql://localhost:3306/test"; private static final String DB_USERNAME = "root"; private static final String DB_PASSWORD = "abc1234"; @SneakyThrows protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Integer id = Integer.valueOf(request.getParameter("id")); String op = request.getParameter("op"); String whereCome = request.getHeader("Referer"); String redirectPath = null; // 如果在主页点击加入购物车超链接,不跳转 if (whereCome.equals("http://localhost:8080/sy7/home.jsp")) { redirectPath = request.getContextPath() + "/sy7/home.jsp"; } else { // 如果在购物车页面增加或删除商品也不跳转 redirectPath = request.getContextPath() + "/sy7/cart.jsp"; } HttpSession session = request.getSession(); Map cart = (Map) session.getAttribute("cart"); if (ObjectUtils.isEmpty(cart)) { cart = new HashMap(); } switch (op) { // 添加商品 case "add": if (!ObjectUtils.isEmpty(cart.get(id))) { ProductVo productVo = cart.get(id); productVo.setCount(productVo.getCount() + 1); cart.put(id, productVo); } else { Class.forName("com.mysql.jdbc.Driver"); try (Connection conn = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD)) { String query = "SELECT * FROM product WHERE id = ?"; try (PreparedStatement stmt = conn.prepareStatement(query)) { stmt.setInt(1, id); try (ResultSet rs = stmt.executeQuery()) { if (rs.next()) { String name = rs.getString("name"); double price = rs.getDouble("price"); String imagePath = rs.getString("image_path"); Integer iid = rs.getInt("id"); ProductVo productVo = new ProductVo(iid, 1, name, price, imagePath); cart.put(id, productVo); } } } } catch (SQLException e) { e.printStackTrace(); } } break; // 减少商品 case "sub": if (!ObjectUtils.isEmpty(cart.get(id))) { ProductVo productVo = cart.get(id); // 防止出现负数 if (productVo.getCount() > 1) { productVo.setCount(productVo.getCount() - 1); cart.put(id, productVo); } else { // 如果小于1则移除商品 cart.remove(id); } } break; } session.setAttribute("cart", cart); response.sendRedirect(redirectPath); } }
5. JSP页面
(1)展现商品列表(home.jsp)
CSS
table { border-collapse: collapse; width: 86%; } table, th, td { border: 1px solid gainsboro; } td { width: 200px; } .redText { color: #FF0000; } .pinkTest { color: lightpink; }
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(2)登陆页面(login.jsp)
JSP程序段+JS代码
var error = ''; alert(error);
HTML
body { display: flex; justify-content: center; padding-top: 40px; } .titlecolor{ color: lightpink; }登录页面
登录账号
用户名: | ” id=”username” name=”username” required> | |
” id=”password” name=”password” required> | ||
记住密码 |
(3)登录后台处理页面(loginAction.jsp)
(4)结账页面(checkout.jsp)
HTML+JSP+JSTL
结算 订单信息
cart = (Map) session.getAttribute("cart"); if (cart == null) { out.println("购物车为空"); return; } %>您应支付:¥${totalAmount}
(5)购物车页面(cart.jsp)
CSS
table { border-collapse: collapse; } table, th, td { border: 1px solid gainsboro; } .titleTest { color: lightpink; } td { width: 20%; } a { text-decoration: none; }
HTML
购物车 我的购物车
商品信息 | 单价 | 数量 | 金额 |
---|---|---|---|
|
¥:${product.price} | ${product.count} | ¥:${product.count*product.price} |
总结
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