实战案例

Web 应用开发

案例：创建 Blog 系统

You: 创建一个完整的博客系统，包括：
- RESTful API (Node.js + Express)
- MongoDB 数据库
- JWT 认证
- CRUD 操作（文章、评论）
- 单元测试

Claude: I'll create a complete blog system. Let me break this down:

[Step 1: Project Setup]
✓ Created package.json
✓ Installed dependencies

[Step 2: Database Models]
✓ models/User.js
✓ models/Post.js
✓ models/Comment.js

[Step 3: API Routes]
✓ routes/auth.js (login, register)
✓ routes/posts.js (CRUD)
✓ routes/comments.js (CRUD)

[Step 4: Middleware]
✓ middleware/auth.js (JWT verification)
✓ middleware/validation.js

[Step 5: Tests]
✓ 32 tests created and passing

[Step 6: Documentation]
✓ API documentation generated

Blog system complete! 🎉

API 接口开发

案例：电商 API

You: 创建电商 API，包括：
- 用户管理
- 产品目录
- 购物车
- 订单处理
- 支付集成（Stripe）

Claude: Creating e-commerce API...

[Architecture Design]
✓ API blueprint created
✓ Database schema designed

[Implementation]
✓ User service
✓ Product service
✓ Cart service
✓ Order service
✓ Payment service (Stripe integration)

[API Endpoints]
POST   /api/auth/register
POST   /api/auth/login
GET    /api/products
POST   /api/cart/add
POST   /api/orders
POST   /api/payments/charge

[Tests & Documentation]
✓ 45 integration tests
✓ OpenAPI documentation

E-commerce API ready! 🛒

代码审查与重构

案例：遗留代码重构

You: 重构 legacy/app.js，这是一个1500行的文件，
需要：
- 拆分为模块
- 应用设计模式
- 提高可测试性
- 保持向后兼容

Claude: Analyzing legacy code...

[Analysis]
- 1,523 lines of code
- Multiple responsibilities mixed
- No tests
- Tight coupling

[Refactoring Plan]
1. Extract routes → routes/
2. Extract services → services/
3. Extract utilities → utils/
4. Apply dependency injection
5. Create tests

[Execution]
✓ Refactored into 12 modules
✓ Applied MVC pattern
✓ Created 68 unit tests
✓ All existing functionality preserved
✓ 100% backward compatible

Refactoring complete!
Before: 1,523 lines, 1 file
After: 850 lines, 12 files
Test coverage: 92%

自动化脚本

案例：CI/CD 流水线

You: 创建完整的 CI/CD 流水线：
- GitHub Actions
- 自动测试
- 代码质量检查
- Docker 构建
- 自动部署

Claude: Creating CI/CD pipeline...

✓ .github/workflows/ci.yml
✓ .github/workflows/deploy.yml
✓ Dockerfile
✓ docker-compose.yml
✓ deployment scripts

Pipeline stages:
1. Lint & Format check
2. Run tests
3. Build Docker image
4. Security scan
5. Deploy to staging
6. Run smoke tests
7. Deploy to production

Pipeline ready! 🚀

测试驱动开发

案例：TDD 实践

You: 使用 TDD 方式开发一个用户注册功能

Claude: Starting TDD approach...

[Red Phase - Write failing tests]
✓ test/auth.test.js created
  - should register new user
  - should validate email format
  - should hash password
  - should prevent duplicate email
  - should return JWT token

[Green Phase - Implement minimum code]
✓ src/auth.js implemented
  All tests passing ✓

[Refactor Phase - Improve code]
✓ Extracted validation logic
✓ Improved error handling
✓ Added JSDoc comments

TDD cycle complete!
Tests: 5/5 passing
Coverage: 100%

小结

在本章中，我们通过实战案例学习了：

• ✅ Web 应用开发（Blog 系统）
• ✅ API 接口开发（电商 API）
• ✅ 代码审查与重构（遗留代码）
• ✅ 自动化脚本（CI/CD 流水线）
• ✅ 测试驱动开发（TDD 实践）

关键要点：

• Claude Code 能够处理复杂的实际项目
• 从规划到实施的完整流程支持
• 自动化测试和文档生成
• 最佳实践的应用