在 Spring MVC 中用另一个模型的数据填充模型

Question

我有一个使用我的"menuModel" 生成的.jsp 页面，现在在可视化此页面后，用户插入他/她的名字并单击Confirm My Order 按钮。

通过单击此按钮，我想将此menuModel 的数据复制到另一个名为“ordersModel”的模型中。由于这个ordersModel没有实例化，所以不知道如何将menuModel的数据复制到ordersModel中。

<form:form id="myOrderMenuId" action="${pageContext.request.contextPath}/OrderSent" method="post" commandName="ordersModel" >
            <c:forEach items="#{menuModel.foodList}" var="foodModel" varStatus="status">
                <c:if test="${foodModel.quantity != 0}">
                <!-- <form:hidden value='${foodModel.foodName}' path='orders[${status.index}].foodName'/>
                <form:hidden value='${foodModel.quantity}' path='orders[${status.index}].quantity'/> -->
                    <div>
                        <table class="itemList">
                            <tr>
                                <td style="width: 170px">
                                    <span id="foodNameId${foodModel.foodId}"><c:out value="${foodModel.foodName}"/></span>
                                </td>
                                <td>
                                    <span id="quantityId${foodModel.foodId}" style="margin-left: 110px;"><c:out value="${foodModel.quantity}"/></span>
                                </td>
                                <td>
                                    <span id="priceId${foodModel.foodId}" style="margin-left: 110px;"><c:out value="${foodModel.price}"/></span>
                                    <span> &euro;</span>
                                </td>
                                <td>
                                    <span class="eachPrice" id="totalPriceId${foodModel.foodId}" style="margin-left: 110px;"><c:out value="${foodModel.totalPrice}"/></span>
                                    <span> &euro;</span>
                                </td>
                            </tr>
                        </table>
                    </div>
                </c:if>
            </c:forEach>

            <span class="itemList" style="color: #80FF00; margin-left: -300px">Total:</span>
            <span id="totalPayment" class="itemList" style="color: #80FF00; margin-left: 5px"></span>
            <span class="itemList" style="color: #80FF00;"> &euro;</span><br/>
            <div class="itemList" style="margin-left:-1130px">Your Name: <input path="ownerName" name="orderName" class="myInbox" id="orderName"/></div>
            <button id="viewMyOrder" class="greyButton" style="position:relative; left: -530px">Confirm My Order</button>
</form:form>

这是我的OrdersModel：

public class OrdersModel {

  private String ownerName;
  private List<Order> orders;

  //getters and setters
}

正如我在代码中评论的那样，如何将数据复制到ordersModel。

更新

我的控制器如下所示：

@RequestMapping(value = "/myOrder", method = RequestMethod.POST)
public String viewMyOrder(Model model, 
        @ModelAttribute("menuModel")MenuModel menuModel) {
    logger.info("You are in view my order page.");

    List<FoodModel> foodModelList = new ArrayList<FoodModel>();
    for (FoodModel foodModel : menuModel.getFoodList()) {
        FoodModel foodModelNew = new FoodModel(); 
        if (foodModel.getQuantity()!=0){
            foodModelNew.setFoodId(foodModel.getFoodId());
            foodModelNew.setFoodName(foodModel.getFoodName());
            foodModelNew.setQuantity(foodModel.getQuantity());
            foodModelNew.setPrice(foodModel.getPrice());
            foodModelNew.setTotalPrice(foodModel.getQuantity() * foodModel.getPrice());
        }
        foodModelList.add(foodModelNew);
    }
    menuModel.setFoodList(foodModelList);
    return "myOrder";
}

@RequestMapping(value = "/OrderSent", method = RequestMethod.POST)
public String orderSent(@ModelAttribute("ordersModel")OrdersModel ordersModel, 
        @RequestParam("orderName") String owner, Model model) {
    logger.debug("Your order has been received");

    model.addAttribute("owner", owner);


    return "orderSent";
 }
}

Answer 1

为什么不在控制器中用FoodModels 填充OrdersModel.orders，然后渲染JSP？

<form:form id="myOrderMenuId" action="${pageContext.request.contextPath}/OrderSent" method="post" commandName="ordersModel" >
            <c:forEach items="#{ordersModel.order}" var="foodModel" varStatus="status">

...

控制器：

@RequestMapping(value = "/myOrder", method = RequestMethod.POST)
public String viewMyOrder(Model model, @ModelAttribute("menuModel")MenuModel menuModel) {
    logger.info("You are in view my order page.");

    OrdersModel ordersModel = new OrdersModel()

    List<FoodModel> foodModelList = new ArrayList<FoodModel>();
    for (FoodModel foodModel : menuModel.getFoodList()) {
        Order foodModelNew = new Order(); 
        if (foodModel.getQuantity()!=0){
            foodModelNew.setFoodId(foodModel.getFoodId());
            foodModelNew.setFoodName(foodModel.getFoodName());
            foodModelNew.setQuantity(foodModel.getQuantity());
            foodModelNew.setPrice(foodModel.getPrice());
            foodModelNew.setTotalPrice(foodModel.getQuantity() * foodModel.getPrice());
        }
        ordersModel.add(foodModelNew);
    }
    model.addAttribute("ordersModel", ordersModel);
    return "myOrder";
}