CREATE TABLE `orders` (
  `oid` int(11) NOT NULL AUTO_INCREMENT,
  `total` double DEFAULT NULL,
  `ordertime` datetime DEFAULT NULL,
  `state` int(11) DEFAULT NULL,
  `name` varchar(20) DEFAULT NULL,
  `addr` varchar(100) DEFAULT NULL,
  `phone` varchar(20) DEFAULT NULL,
  `uid` int(11) DEFAULT NULL,
  PRIMARY KEY (`oid`),
  KEY `FKC3DF62E5AA3D9C7` (`uid`),
  CONSTRAINT `FKC3DF62E5AA3D9C7` FOREIGN KEY (`uid`) REFERENCES `user` (`uid`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

CREATE TABLE `orderitem` (
  `itemid` int(11) NOT NULL AUTO_INCREMENT,
  `count` int(11) DEFAULT NULL,
  `subtotal` double DEFAULT NULL,
  `pid` int(11) DEFAULT NULL,
  `oid` int(11) DEFAULT NULL,
  PRIMARY KEY (`itemid`),
  KEY `FKE8B2AB6166C01961` (`oid`),
  KEY `FKE8B2AB6171DB7AE4` (`pid`),
  CONSTRAINT `FKE8B2AB6166C01961` FOREIGN KEY (`oid`) REFERENCES `orders` (`oid`),
  CONSTRAINT `FKE8B2AB6171DB7AE4` FOREIGN KEY (`pid`) REFERENCES `product` (`pid`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

public class Order {
	private Integer oid;
	private Double total;
	private Date ordertime;
	private String name;
	private String addr;
	private String phone;
	private Integer state;
	// 與用戶的關聯(lián)關系
	private User user;
	// 與訂單項關聯(lián)關系
	private Set<OrderItem> orderItems = new HashSet<OrderItem>();
        ....
}

public class OrderItem {
	private Integer itemid;
	private Integer count;
	private Double subtotal;
	private Product product;
	private Order order;
        ....
}

public String createOrder() {
	// 將Order對象存入到數據庫中:
	// 封裝Order對象:
	Order order = new Order();
	// 封裝總價---從購物車的信息獲得.
	// 獲得購物車:
	Cart cart = (Cart) ServletActionContext.getRequest().getSession()
			.getAttribute("cart");
	// 判斷:
	if (cart == null) {
		this.addActionError("親!您還沒有購物!請先去購物!");
		return "msg";
	}
	// 設置所屬用戶:
	User existUser = (User) ServletActionContext.getRequest().getSession()
			.getAttribute("existUser");
	if (existUser == null) {
		this.addActionError("親!您還沒有登錄!請先去登錄!");
		return "msg";
	}
	order.setUser(existUser);
	order.setTotal(cart.getTotal());
	// 封裝時間
	order.setOrdertime(new Date());
	// 封裝狀態(tài)
	order.setState(1); // 1 未付款 2 已經付款,未發(fā)貨 3.已經發(fā)貨,沒有確認收貨 4.訂單完成.
	// 為訂單設置訂單項集合:
	for (CartItem cartItem : cart.getCartItems()) {
		// 將購物項的數據封裝到訂單項中.
		OrderItem orderItem = new OrderItem();
		orderItem.setCount(cartItem.getCount());
		orderItem.setSubtotal(cartItem.getSubtotal());
		orderItem.setProduct(cartItem.getProduct());
		orderItem.setOrder(order);
		// 放入訂單的集合:
		order.getOrderItems().add(orderItem);
	}
	// 購物車清空了.
	cart.clearCart();
	// 調用Service保存訂單的操作:
	orderService.save(order);

	// 將訂單存入到值棧中:
	ActionContext.getContext().getValueStack().set("order", order);
	// 頁面跳轉:
	return "createOrderSuccess";
}