Ejemplo Práctico: Microservicios de Pedidos y Productos con Spring Boot

OrderController.java

@SpringBootApplication
public class OrderServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderServiceApplication.class, args);
    }
}

@RestController
@RequestMapping("/orders")
public class OrderController {
    private final OrderService orderService;
    private final RestTemplate restTemplate;

    @Autowired
    public OrderController(OrderService orderService, RestTemplate restTemplate) {
        this.orderService = orderService;
        this.restTemplate = restTemplate;
    }

    @PostMapping
    public ResponseEntity<Order> createOrder(@RequestBody OrderRequest orderRequest) {
        Arrays.asList(orderRequest.getProductIds()).forEach(productId -> {
            ResponseEntity<Product> productResponse =
                restTemplate.getForEntity("http://product-service/products/" + productId, Product.class);
            if (!productResponse.getStatusCode().is2xxSuccessful()) {
                throw new RuntimeException("Product validation failed");
            }
        });

        Order order = orderService.createOrder(orderRequest);
        return ResponseEntity.ok(order);
    }
}

@Bean
public RestTemplate restTemplate() {
    return new RestTemplate();
}

ProductCpmtroller.java

@SpringBootApplication
public class ProductServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProductServiceApplication.class, args);
    }
}

@RestController
@RequestMapping("/products")
public class ProductController {
    private final ProductService productService;

    @Autowired
    public ProductController(ProductService productService) {
        this.productService = productService;
    }

    @GetMapping("/{id}")
    public ResponseEntity<Product> getProductById(@PathVariable Long id) {
        Product product = productService.getProductById(id);
        return ResponseEntity.ok(product);
    }
}