鸿蒙电商购物车项目：用户管理、商品列表与购物车实现

2. 用户注册应用

entry/src/main/ets/pages/RegistrationPage.ets

import { UserRegistrationUtil } from '../utils/UserRegistrationUtil';

@Entry
@Component
struct RegistrationPage {
    @State email: string = '';
    @State password: string = '';
    @State verificationCode: string = '';

    build() {
        Column({ space: 16 }) {
            InputComponent({ placeholder: '请输入邮箱', value: this.email, onChange: (value: string) => { this.email = value; }, type: InputType.Email });
            InputComponent({ placeholder: '请输入密码', value: this.password, onChange: (value: string) => { this.password = value; }, type: InputType.Password });
            InputComponent({ placeholder: '请输入验证码', value: this.verificationCode, onChange: (value: string) => { this.verificationCode = value; }, type: InputType.Normal });
            ButtonComponent({ text: '发送验证码', onClick: async () => { await this.sendVerificationCode(); }, disabled: !this.email });
            ButtonComponent({ text: '注册', onClick: async () => { await this.register(); }, disabled: !this.email || !this.password || !this.verificationCode });
        }.width('100%').height('100%').padding(16).backgroundColor('#F5F5F5');
    }

    aboutToAppear() {
        // 初始化用户注册
        UserRegistrationUtil.getInstance().init();
    }

    async sendVerificationCode(): Promise<void> {
        const result = await UserRegistrationUtil.getInstance().sendVerificationCode(this.email);
        if (result.success) {
            promptAction.showToast({ message: '验证码发送成功' });
        } else {
            promptAction.showToast({ message: '验证码发送失败' });
        }
    }

    async register(): Promise<void> {
        const result = await UserRegistrationUtil.getInstance().register(this.email, this.password);
        if (result.success) {
            promptAction.showToast({ message: '注册成功' });
            router.pushUrl({ url: '/pages/LoginPage' });
        } else {
            promptAction.showToast({ message: '注册失败' });
        }
    }
}

2.3 用户登录实现

1. 用户登录工具类

entry/src/main/ets/utils/UserLoginUtil.ets

import user from '@ohos.user';

// 用户登录工具类
export class UserLoginUtil {
    private static instance: UserLoginUtil | null = null;
    private userHelper: user.UserHelper | null = null;

    static getInstance(): UserLoginUtil {
        if (!UserLoginUtil.instance) {
            UserLoginUtil.instance = new UserLoginUtil();
        }
        return UserLoginUtil.instance;
    }

    async init(): Promise<void> {
        if (!this.userHelper) {
            this.userHelper = user.createUserHelper();
        }
    }

    async login(email: string, password: string): Promise<user.UserLoginResult> {
        if (!this.userHelper) {
            return null;
        }
        const result = await this.userHelper.login(email, password);
        return result;
    }

    async forgetPassword(email: string): Promise<user.ForgetPasswordResult> {
        if (!this.userHelper) {
            return null;
        }
        const result = await this.userHelper.forgetPassword(email);
        return result;
    }
}

2. 用户登录应用

entry/src/main/ets/pages/LoginPage.ets

import { UserLoginUtil } from '../utils/UserLoginUtil';

@Entry
@Component
struct LoginPage {
    @State email: string = '';
    @State password: string = '';

    build() {
        Column({ space: 16 }) {
            InputComponent({ placeholder: '请输入邮箱', value: this.email, onChange: (value: string) => { this.email = value; }, type: InputType.Email });
            InputComponent({ placeholder: '请输入密码', value: this.password, onChange: (value: string) => { this.password = value; }, type: InputType.Password });
            ButtonComponent({ text: '登录', onClick: async () => { await this.login(); }, disabled: !this.email || !this.password });
            Text('忘记密码').fontSize(14).textColor('#666666').onClick(() => { this.forgetPassword(); });
        }.width('100%').height('100%').padding(16).backgroundColor('#F5F5F5');
    }

    aboutToAppear() {
        UserLoginUtil.getInstance().init();
    }

    async login(): Promise<void> {
        const result = await UserLoginUtil.getInstance().login(this.email, this.password);
        if (result.success) {
            promptAction.showToast({ message: '登录成功' });
            router.pushUrl({ url: '/pages/HomePage' });
        } else {
            promptAction.showToast({ message: '登录失败' });
        }
    }

    async forgetPassword(): Promise<void> {
        const result = await UserLoginUtil.getInstance().forgetPassword(this.email);
        if (result.success) {
            promptAction.showToast({ message: '密码重置邮件已发送' });
        } else {
            promptAction.showToast({ message: '密码重置邮件发送失败' });
        }
    }
}

2.4 用户信息管理实现

1. 用户信息管理工具类

entry/src/main/ets/utils/UserInformationManagementUtil.ets

import user from '@ohos.user';

export class UserInformationManagementUtil {
    private static instance: UserInformationManagementUtil | null = null;
    private userHelper: user.UserHelper | null = null;

    static getInstance(): UserInformationManagementUtil {
        if (!UserInformationManagementUtil.instance) {
            UserInformationManagementUtil.instance = new UserInformationManagementUtil();
        }
        return UserInformationManagementUtil.instance;
    }

    async init(): Promise<void> {
        if (!this.userHelper) {
            this.userHelper = user.createUserHelper();
        }
    }

    async getUserInformation(): Promise<user.UserInformation> {
        if (!this.userHelper) {
            return null;
        }
        const result = await this.userHelper.getUserInformation();
        return result;
    }

    async modifyUserInformation(information: user.UserInformation): Promise<user.ModifyUserInformationResult> {
        if (!this.userHelper) {
            return null;
        }
        const result = await this.userHelper.modifyUserInformation(information);
        return result;
    }

    async modifyPassword(oldPassword: string, newPassword: string): Promise<user.ModifyPasswordResult> {
        if (!this.userHelper) {
            return null;
        }
        const result = await this.userHelper.modifyPassword(oldPassword, newPassword);
        return result;
    }
}

2. 用户信息管理应用

entry/src/main/ets/pages/UserInformationPage.ets

import { UserInformationManagementUtil } from '../utils/UserInformationManagementUtil';

@Entry
@Component
struct UserInformationPage {
    @State userInformation: user.UserInformation | null = null;
    @State name: string = '';
    @State avatarUrl: string = '';
    @State oldPassword: string = '';
    @State newPassword: string = '';

    build() {
        Column({ space: 16 }) {
            if (this.userInformation) {
                Text(`用户 ID：${this.userInformation.userId}`).fontSize(14).textColor('#666666');
            }
            InputComponent({ placeholder: '请输入姓名', value: this.name, onChange: (value: string) => { this.name = value; }, type: InputType.Normal });
            InputComponent({ placeholder: '请输入头像 URL', value: this.avatarUrl, onChange: (value: string) => { this.avatarUrl = value; }, type: InputType.Normal });
            ButtonComponent({ text: '修改用户信息', onClick: async () => { await this.modifyUserInformation(); }, disabled: !this.name || !this.avatarUrl });
            InputComponent({ placeholder: '请输入旧密码', value: this.oldPassword, onChange: (value: string) => { this.oldPassword = value; }, type: InputType.Password });
            InputComponent({ placeholder: '请输入新密码', value: this.newPassword, onChange: (value: string) => { this.newPassword = value; }, type: InputType.Password });
            ButtonComponent({ text: '修改密码', onClick: async () => { await this.modifyPassword(); }, disabled: !this.oldPassword || !this.newPassword });
        }.width('100%').height('100%').padding(16).backgroundColor('#F5F5F5');
    }

    aboutToAppear() {
        UserInformationManagementUtil.getInstance().init();
        this.getUserInformation();
    }

    async getUserInformation(): Promise<void> {
        this.userInformation = await UserInformationManagementUtil.getInstance().getUserInformation();
        this.name = this.userInformation?.name ?? '';
        this.avatarUrl = this.userInformation?.avatarUrl ?? '';
    }

    async modifyUserInformation(): Promise<void> {
        const result = await UserInformationManagementUtil.getInstance().modifyUserInformation({ userId: this.userInformation?.userId ?? 0, name: this.name, avatarUrl: this.avatarUrl, email: this.userInformation?.email ?? '' });
        if (result.success) {
            promptAction.showToast({ message: '修改用户信息成功' });
            this.getUserInformation();
        } else {
            promptAction.showToast({ message: '修改用户信息失败' });
        }
    }

    async modifyPassword(): Promise<void> {
        const result = await UserInformationManagementUtil.getInstance().modifyPassword(this.oldPassword, this.newPassword);
        if (result.success) {
            promptAction.showToast({ message: '修改密码成功' });
            this.oldPassword = '';
            this.newPassword = '';
        } else {
            promptAction.showToast({ message: '修改密码失败' });
        }
    }
}

三、商品列表实战

3.1 实战目标

• 商品列表：显示商品列表；
• 商品详情：显示商品详情；
• 商品搜索：搜索商品。

3.2 商品列表实现

1. 商品列表工具类

entry/src/main/ets/utils/ProductListUtil.ets

import product from '@ohos.product';

export class ProductListUtil {
    private static instance: ProductListUtil | null = null;
    private productHelper: product.ProductHelper | null = null;

    static getInstance(): ProductListUtil {
        if (!ProductListUtil.instance) {
            ProductListUtil.instance = new ProductListUtil();
        }
        return ProductListUtil.instance;
    }

    async init(): Promise<void> {
        if (!this.productHelper) {
            this.productHelper = product.createProductHelper();
        }
    }

    async getProductList(): Promise<Array<product.Product>> {
        if (!this.productHelper) {
            return [];
        }
        const result = await this.productHelper.getProductList();
        return result;
    }

    async searchProduct(keyword: string): Promise<Array<product.Product>> {
        if (!this.productHelper) {
            return [];
        }
        const result = await this.productHelper.searchProduct(keyword);
        return result;
    }
}

2. 商品列表应用

entry/src/main/ets/pages/ProductListPage.ets

import { ProductListUtil } from '../utils/ProductListUtil';

@Entry
@Component
struct ProductListPage {
    @State productList: Array<product.Product> = [];
    @State searchKeyword: string = '';

    build() {
        Column({ space: 16 }) {
            InputComponent({ placeholder: '请输入搜索关键词', value: this.searchKeyword, onChange: (value: string) => { this.searchKeyword = value; }, type: InputType.Normal });
            ButtonComponent({ text: '搜索', onClick: async () => { await this.searchProduct(); }, disabled: !this.searchKeyword });
            ListComponent({ data: this.productList, renderItem: (item: product.Product, index: number) => {
                Row({ space: 16 }) {
                    Image(item.avatarUrl).width(80).height(80).objectFit(ImageFit.Cover).borderRadius(8);
                    Column({ space: 8 }) {
                        Text(item.name).fontSize(16).fontWeight(FontWeight.Bold).textColor('#000000');
                        Text(item.description).fontSize(14).textColor('#666666').maxLines(2).textOverflow({ overflow: TextOverflow.Ellipsis });
                        Text(`¥${item.price}`).fontSize(16).fontWeight(FontWeight.Bold).textColor('#FF0000');
                    }.layoutWeight(1);
                    ButtonComponent({ text: '查看详情', onClick: () => { router.pushUrl({ url: '/pages/ProductDetailPage', params: { productId: item.productId } }); }, disabled: false });
                }.width('100%').height('auto').padding(16).backgroundColor('#FFFFFF').borderRadius(8).margin({ bottom: 8 });
            }, onItemClick: (item: product.Product, index: number) => { router.pushUrl({ url: '/pages/ProductDetailPage', params: { productId: item.productId } }); }});
        }.width('100%').height('100%').padding(16).backgroundColor('#F5F5F5');
    }

    aboutToAppear() {
        ProductListUtil.getInstance().init();
        this.getProductList();
    }

    async getProductList(): Promise<void> {
        this.productList = await ProductListUtil.getInstance().getProductList();
    }

    async searchProduct(): Promise<void> {
        this.productList = await ProductListUtil.getInstance().searchProduct(this.searchKeyword);
    }
}

3.3 商品详情实现

1. 商品详情工具类

entry/src/main/ets/utils/ProductDetailUtil.ets

import product from '@ohos.product';

export class ProductDetailUtil {
    private static instance: ProductDetailUtil | null = null;
    private productHelper: product.ProductHelper | null = null;

    static getInstance(): ProductDetailUtil {
        if (!ProductDetailUtil.instance) {
            ProductDetailUtil.instance = new ProductDetailUtil();
        }
        return ProductDetailUtil.instance;
    }

    async init(): Promise<void> {
        if (!this.productHelper) {
            this.productHelper = product.createProductHelper();
        }
    }

    async getProductDetail(productId: number): Promise<product.Product> {
        if (!this.productHelper) {
            return null;
        }
        const result = await this.productHelper.getProductDetail(productId);
        return result;
    }

    async addToCart(productId: number, quantity: number): Promise<product.AddToCartResult> {
        if (!this.productHelper) {
            return null;
        }
        const result = await this.productHelper.addToCart(productId, quantity);
        return result;
    }
}

2. 商品详情应用

entry/src/main/ets/pages/ProductDetailPage.ets

import { ProductDetailUtil } from '../utils/ProductDetailUtil';
import { CartManagementUtil } from '../utils/CartManagementUtil';

@Entry
@Component
struct ProductDetailPage {
    @State product: product.Product | null = null;
    @State quantity: number = 1;
    @State productId: number = 0;

    build() {
        Column({ space: 16 }) {
            if (this.product) {
                Image(this.product.avatarUrl).width('100%').height(240).objectFit(ImageFit.Cover).borderRadius(8);
                Text(this.product.name).fontSize(18).fontWeight(FontWeight.Bold).textColor('#000000');
                Text(this.product.description).fontSize(14).textColor('#666666').maxLines(5).textOverflow({ overflow: TextOverflow.Ellipsis });
                Text(`¥${this.product.price}`).fontSize(18).fontWeight(FontWeight.Bold).textColor('#FF0000');
                Row({ space: 16 }) {
                    Text('数量：').fontSize(14).textColor('#000000');
                    ButtonComponent({ text: '-', onClick: () => { if (this.quantity > 1) { this.quantity--; } }, disabled: this.quantity <= 1 });
                    Text(`${this.quantity}`).fontSize(14).textColor('#000000');
                    ButtonComponent({ text: '+', onClick: () => { this.quantity++; }, disabled: this.quantity >= 10 });
                }.width('100%').height('auto').justifyContent(FlexAlign.Center);
                ButtonComponent({ text: '添加到购物车', onClick: async () => { await this.addToCart(); }, disabled: !this.product });
            }
        }.width('100%').height('100%').padding(16).backgroundColor('#F5F5F5');
    }

    aboutToAppear() {
        ProductDetailUtil.getInstance().init();
        CartManagementUtil.getInstance().init();
        this.getProductDetail();
    }

    async getProductDetail(): Promise<void> {
        const params = router.getParams() as { productId: number };
        this.productId = params.productId;
        this.product = await ProductDetailUtil.getInstance().getProductDetail(this.productId);
    }

    async addToCart(): Promise<void> {
        const result = await CartManagementUtil.getInstance().addToCart(this.productId, this.quantity);
        if (result.success) {
            promptAction.showToast({ message: '添加到购物车成功' });
        } else {
            promptAction.showToast({ message: '添加到购物车失败' });
        }
    }
}

四、购物车管理实战

4.1 实战目标

• 购物车列表：显示购物车列表；
• 添加商品到购物车：添加商品到购物车；
• 修改购物车商品数量：修改购物车商品数量；
• 删除购物车商品：删除购物车商品。

4.2 购物车管理工具类

entry/src/main/ets/utils/CartManagementUtil.ets

import cart from '@ohos.cart';

export class CartManagementUtil {
    private static instance: CartManagementUtil | null = null;
    private cartHelper: cart.CartHelper | null = null;

    static getInstance(): CartManagementUtil {
        if (!CartManagementUtil.instance) {
            CartManagementUtil.instance = new CartManagementUtil();
        }
        return CartManagementUtil.instance;
    }

    async init(): Promise<void> {
        if (!this.cartHelper) {
            this.cartHelper = cart.createCartHelper();
        }
    }

    async getCartList(): Promise<Array<cart.CartItem>> {
        if (!this.cartHelper) {
            return [];
        }
        const result = await this.cartHelper.getCartList();
        return result;
    }

    async addToCart(productId: number, quantity: number): Promise<cart.AddToCartResult> {
        if (!this.cartHelper) {
            return null;
        }
        const result = await this.cartHelper.addToCart(productId, quantity);
        return result;
    }

    async modifyCartItemQuantity(cartItemId: number, quantity: number): Promise<cart.ModifyCartItemQuantityResult> {
        if (!this.cartHelper) {
            return null;
        }
        const result = await this.cartHelper.modifyCartItemQuantity(cartItemId, quantity);
        return result;
    }

    async deleteCartItem(cartItemId: number): Promise<cart.DeleteCartItemResult> {
        if (!this.cartHelper) {
            return null;
        }
        const result = await this.cartHelper.deleteCartItem(cartItemId);
        return result;
    }

    async clearCart(): Promise<cart.ClearCartResult> {
        if (!this.cartHelper) {
            return null;
        }
        const result = await this.cartHelper.clearCart();
        return result;
    }
}

4.3 购物车应用

entry/src/main/ets/pages/CartPage.ets

import { CartManagementUtil } from '../utils/CartManagementUtil';

@Entry
@Component
struct CartPage {
    @State cartList: Array<cart.CartItem> = [];

    build() {
        Column({ space: 16 }) {
            ListComponent({ data: this.cartList, renderItem: (item: cart.CartItem, index: number) => {
                Row({ space: 16 }) {
                    Image(item.avatarUrl).width(80).height(80).objectFit(ImageFit.Cover).borderRadius(8);
                    Column({ space: 8 }) {
                        Text(item.name).fontSize(16).fontWeight(FontWeight.Bold).textColor('#000000');
                        Text(item.description).fontSize(14).textColor('#666666').maxLines(2).textOverflow({ overflow: TextOverflow.Ellipsis });
                        Text(`¥${item.price}`).fontSize(16).fontWeight(FontWeight.Bold).textColor('#FF0000');
                    }.layoutWeight(1);
                    Row({ space: 8 }) {
                        ButtonComponent({ text: '-', onClick: async () => { await this.modifyCartItemQuantity(item.cartItemId, item.quantity - 1); }, disabled: item.quantity <= 1 });
                        Text(`${item.quantity}`).fontSize(14).textColor('#000000');
                        ButtonComponent({ text: '+', onClick: async () => { await this.modifyCartItemQuantity(item.cartItemId, item.quantity + 1); }, disabled: item.quantity >= 10 });
                    }.width('auto').height('auto');
                    ButtonComponent({ text: '删除', onClick: async () => { await this.deleteCartItem(item.cartItemId); }, disabled: false });
                }.width('100%').height('auto').padding(16).backgroundColor('#FFFFFF').borderRadius(8).margin({ bottom: 8 });
            }, onItemClick: (item: cart.CartItem, index: number) => { router.pushUrl({ url: '/pages/ProductDetailPage', params: { productId: item.productId } }); }});
            ButtonComponent({ text: '清空购物车', onClick: async () => { await this.clearCart(); }, disabled: this.cartList.length === 0 });
        }.width('100%').height('100%').padding(16).backgroundColor('#F5F5F5');
    }

    aboutToAppear() {
        CartManagementUtil.getInstance().init();
        this.getCartList();
    }

    async getCartList(): Promise<void> {
        this.cartList = await CartManagementUtil.getInstance().getCartList();
    }

    async modifyCartItemQuantity(cartItemId: number, quantity: number): Promise<void> {
        const result = await CartManagementUtil.getInstance().modifyCartItemQuantity(cartItemId, quantity);
        if (result.success) {
            this.getCartList();
        } else {
            promptAction.showToast({ message: '修改购物车商品数量失败' });
        }
    }

    async deleteCartItem(cartItemId: number): Promise<void> {
        const result = await CartManagementUtil.getInstance().deleteCartItem(cartItemId);
        if (result.success) {
            this.getCartList();
        } else {
            promptAction.showToast({ message: '删除购物车商品失败' });
        }
    }

    async clearCart(): Promise<void> {
        const result = await CartManagementUtil.getInstance().clearCart();
        if (result.success) {
            this.getCartList();
        } else {
            promptAction.showToast({ message: '清空购物车失败' });
        }
    }
}

五、项目配置与部署

5.1 配置文件修改

在 entry/src/main/module.json5 中添加用户管理、商品列表、购物车相关配置。

5.2 项目部署

1. 编译项目：在 DevEco Studio 中点击 Build → Build HAP。
2. 部署到设备：将编译后的 HAP 文件部署到鸿蒙设备上。
3. 测试功能：验证用户注册、登录、信息管理、商品列表、详情、搜索及购物车操作。