身臨其境：使用微服務架構開發Java功能的實際案例

@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @PostMapping("/register")
    public void registerUser(@RequestBody UserDto userDto) {
        userService.registerUser(userDto);
    }

    @PostMapping("/login")
    public void loginUser(@RequestBody UserDto userDto) {
        userService.loginUser(userDto);
    }

    @GetMapping("/users/{id}")
    public UserDto getUserById(@PathVariable String id) {
        return userService.getUserById(id);
    }
}

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public void registerUser(UserDto userDto) {
        User user = new User(userDto);
        userRepository.save(user);
    }

    public void loginUser(UserDto userDto) {
        // 验证用户信息并生成登录令牌
    }

    public UserDto getUserById(String id) {
        User user = userRepository.findById(id)
                .orElseThrow(() -> new NotFoundException("User not found"));
        return new UserDto(user);
    }
}

@RestController
public class ProductController {

    @Autowired
    private ProductService productService;

    @GetMapping("/products/{id}")
    public ProductDto getProductById(@PathVariable String id) {
        return productService.getProductById(id);
    }

    @GetMapping("/products")
    public List<ProductDto> getProducts() {
        return productService.getAllProducts();
    }
}

@Service
public class ProductService {

    @Autowired
    private ProductRepository productRepository;

    public ProductDto getProductById(String id) {
        Product product = productRepository.findById(id)
                .orElseThrow(() -> new NotFoundException("Product not found"));
        return new ProductDto(product);
    }

    public List<ProductDto> getAllProducts() {
        List<Product> products = productRepository.findAll();
        return products.stream()
                .map(ProductDto::new)
                .collect(Collectors.toList());
    }
}

@RestController
public class OrderController {

    @Autowired
    private OrderService orderService;

    @PostMapping("/orders")
    public void placeOrder(@RequestBody OrderDto orderDto) {
        orderService.placeOrder(orderDto);
    }

    @GetMapping("/orders/{id}")
    public OrderDto getOrderById(@PathVariable String id) {
        return orderService.getOrderById(id);
    }
}