java购物车系统学生实验

package com.shop.ui; import com.shop.entity.Book; import com.shop.entity.Phone; import com.shop.entity.Product; import com.shop.entity.User; import com.shop.service.CartService; import com.shop.service.ProductService; import com.shop.service.UserService; import com.shop.util.ValidationUtil; import java.util.InputMismatchException; import java.util.Scanner; public class ConsoleUI { private static final Scanner scanner = new Scanner(System.in); private static User loggedInUser; private static ProductService productService = new ProductService(); private static UserService userService = new UserService(); private static CartService cartService = new CartService(); public static void main(String[] args) { showWelcomeMessage(); while (true) { if (loggedInUser == null) { showLoginMenu(); } else { showUserMenu(); } } } private static void showWelcomeMessage() { System.out.println("欢迎来到商城系统！"); } private static void showLoginMenu() { System.out.println("1. 登录"); System.out.println("2. 注册"); System.out.println("3. 退出"); int choice = getInput(); switch (choice) { case 1: login(); break; case 2: register(); break; case 3: System.exit(0); default: System.out.println("无效选择，请重新输入。"); } } private static void showUserMenu() { System.out.println("1. 浏览商品"); System.out.println("2. 搜索商品"); System.out.println("3. 购物车"); System.out.println("4. 结账"); System.out.println("5. 修改密码"); System.out.println("6. 添加地址"); System.out.println("7. 退出登录"); System.out.println("8. 购买商品"); System.out.println("9. 添加到购物车"); int choice = getInput(); switch (choice) { case 1: browseProducts(); break; case 2: searchProducts(); break; case 3: viewCart(); break; case 4: checkout(); break; case 5: changePassword(); break; case 6: addAddress(); break; case 7: loggedInUser = null; System.out.println("已退出登录。"); break; case 8: purchase(); break; case 9: addToCart(); break; default: System.out.println("无效选择，请重新输入。"); } } private static void login() { System.out.println("请输入用户名："); String username = scanner.nextLine(); System.out.println("请输入密码："); String password = scanner.nextLine(); if (userService.login(username, password)) { loggedInUser = userService.getUserByUsername(username); System.out.println("登录成功！"); } else { System.out.println("用户名或密码错误。"); } } private static void register() { System.out.println("请输入用户名："); String username = scanner.nextLine(); while (!ValidationUtil.isValidUsername(username)) { System.out.println("用户名不符合规则，请重新输入。"); username = scanner.nextLine(); } System.out.println("请输入密码："); String password = scanner.nextLine(); while (!ValidationUtil.isValidPassword(password)) { System.out.println("密码不符合规则，请重新输入。"); password = scanner.nextLine(); } User newUser = new User(generateUserId(), username, password); if (userService.register(newUser)) { System.out.println("注册成功！"); } else { System.out.println("注册失败。"); } } private static int generateUserId() { return userService.getUserList().size() + 1; } private static void browseProducts() { System.out.println("商品列表："); for (Product product : productService.getAllProducts()) { if (product instanceof Book) { Book book = (Book) product; System.out.println("书籍：" + book.getName() + "，作者：" + book.getAuthor() + "，价格：" + book.getPrice()); } else if (product instanceof Phone) { Phone phone = (Phone) product; System.out.println("手机：" + phone.getName() + "，品牌：" + phone.getBrand() + "，价格：" + phone.getPrice()); } } } private static void searchProducts() { System.out.println("请输入搜索关键词："); String keyword = scanner.nextLine(); System.out.println("搜索结果："); for (Product product : productService.getAllProducts()) { if (product.getName().contains(keyword)) { if (product instanceof Book) { Book book = (Book) product; System.out.println("书籍：" + book.getName() + "，作者：" + book.getAuthor() + "，价格：" + book.getPrice()); } else if (product instanceof Phone) { Phone phone = (Phone) product; System.out.println("手机：" + phone.getName() + "，品牌：" + phone.getBrand() + "，价格：" + phone.getPrice()); } } } } private static void viewCart() { System.out.println("购物车："); for (Product product : cartService.getCartItems()) { if (product instanceof Book) { Book book = (Book) product; System.out.println("书籍：" + book.getName() + "，作者：" + book.getAuthor() + "，价格：" + book.getPrice()); } else if (product instanceof Phone) { Phone phone = (Phone) product; System.out.println("手机：" + phone.getName() + "，品牌：" + phone.getBrand() + "，价格：" + phone.getPrice()); } } System.out.println("总价：" + cartService.calculateTotal()); } private static void addToCart() { System.out.println("请输入要添加到购物车的商品 ID："); int productId = getInput(); Product product = productService.getProductById(productId); if (product!= null) { cartService.addToCart(product); System.out.println("商品已添加到购物车。"); } else { System.out.println("商品不存在。"); } } private static void checkout() { double total = cartService.calculateTotal(); System.out.println("购物车总价：" + total); System.out.println("确认结账吗？（Y/N）"); String choice = scanner.nextLine(); if (choice.equalsIgnoreCase("Y")) { System.out.println("购买成功！"); cartService.clearCart(); } else { System.out.println("结账取消。"); } } private static void purchase() { double total = cartService.calculateTotal(); System.out.println("购物车总价：" + total); System.out.println("确认购买吗？（Y/N）"); String choice = scanner.nextLine