你作为一个Java领域的专家,请完成以下任务:写一段Java业务代码,要体现出编码能力的优雅和规范性、可读性、扩展性、可用性
时间: 2024-06-08 22:11:55 浏览: 11
好的,我来写一段Java业务代码,体现编码能力的优雅和规范性、可读性、扩展性、可用性。以下是一个简单的订单服务的实现:
```java
public interface OrderService {
Order createOrder(List<OrderItem> orderItems);
}
public class OrderServiceImpl implements OrderService {
private final OrderRepository orderRepository;
private final ProductService productService;
public OrderServiceImpl(OrderRepository orderRepository, ProductService productService) {
this.orderRepository = orderRepository;
this.productService = productService;
}
@Override
public Order createOrder(List<OrderItem> orderItems) {
// 校验订单项
validateOrderItems(orderItems);
// 查询商品信息
Map<Long, Product> productMap = productService.getProductMap(orderItems.stream().map(OrderItem::getProductId).collect(Collectors.toList()));
// 计算订单总金额
BigDecimal totalPrice = BigDecimal.ZERO;
for (OrderItem item : orderItems) {
Product product = productMap.get(item.getProductId());
BigDecimal itemPrice = product.getPrice().multiply(BigDecimal.valueOf(item.getQuantity()));
totalPrice = totalPrice.add(itemPrice);
}
// 创建订单
Order order = new Order();
order.setOrderItems(orderItems);
order.setTotalPrice(totalPrice);
// 保存订单
orderRepository.save(order);
return order;
}
private void validateOrderItems(List<OrderItem> orderItems) {
if (orderItems == null || orderItems.isEmpty()) {
throw new IllegalArgumentException("订单项不能为空");
}
for (OrderItem item : orderItems) {
if (item.getProductId() == null || item.getQuantity() == null || item.getQuantity() <= 0) {
throw new IllegalArgumentException("订单项参数不正确");
}
}
}
}
public interface OrderRepository {
void save(Order order);
}
public class Order {
private Long id;
private BigDecimal totalPrice;
private List<OrderItem> orderItems;
// getter/setter省略
}
public class OrderItem {
private Long productId;
private Integer quantity;
// getter/setter省略
}
public interface ProductService {
Map<Long, Product> getProductMap(List<Long> productIds);
}
public class Product {
private Long id;
private String name;
private BigDecimal price;
// getter/setter省略
}
```
代码中使用了接口和实现类的设计模式,提高了代码的扩展性。同时,代码使用了依赖注入,使得代码易于维护和测试。在实现具体业务逻辑时,代码采用了流式编程的方式,使得代码更加简洁易懂。在代码中使用了异常处理机制,使得代码更加健壮。