SSH （四）ModelDriven 模型驱动

模型驱动是用于从界面向后台或者从后台向界面数据交互的，一般传递的是对象类型。

Action中定义一个类实现模型驱动接口

public class OrderAction extends ActionSupport implements ModelDriven<Order> {
     private Order order=new Order(); 
     public Order getModel(){
        return order;
    }
}

order类

package cn.itcast.shop.order.vo;
import java.util.Date;
import cn.itcast.shop.user.vo.User;

public class Order  {
   private Integer oid;
   private Double total;
   private Date ordertime;
   private Integer state; 
   //订单所属用户
   private User user;
   //订单中所属的多个订单项
   private Set<OrderItem> orderItems=new HashSet<OrderItem>();

   public Integer getOid() {
    return oid;
   }
public void setOid(Integer oid) {
    this.oid = oid;
}

public Double getTotal() {
    return total;
}
public void setTotal(Double total) {
    this.total = total;
}

public Date getOrdertime() {
    return ordertime;
}
public void setOrdertime(Date ordertime) {
    this.ordertime = ordertime;
}

public Integer getState() {
    return state;
}
public void setState(Integer state) {
    this.state = state;
}


public User getUser() {
    return user;
}
public void setUser(User user) {
    this.user = user;
}

public void setOrderItems(Set<OrderItem> orderItems) {
    this.orderItems = orderItems;
}
public Set<OrderItem> getOrderItems() {
    return orderItems;
}
}

由Action跳转到的界面中就会获取到model对象的信息，Model对象直接存放在栈顶，然后通过struts标签回显到界面上，iterator用于遍历循环每一项。

<s:iterator var="orderItem" value="model.orderItems">
                        <tr>
                            <td width="60">
                                <input type="hidden" name="id" value="22"/>
                                <img src="${pageContext.request.contextPath}/<s:property value="#orderItem.product.image"/>"/>
                            </td>
                            <td>
                                <a target="_blank"><s:property value="#orderItem.product.pname"/></a>
                            </td>
                            <td>
                                <s:property value="#orderItem.product.shop_price"/>
                            </td>
                            <td class="quantity" width="60">
                                <s:property value="#orderItem.count"/>
                                <input type="text" name="count" value="1" maxlength="4" onpaste="return false;"/>
                                <div>
                                    <span class="increase">&nbsp;</span>
                                    <span class="decrease">&nbsp;</span>
                                </div>
                            </td>
                            <td width="140">
                                <span class="subtotal">￥<s:property value="#orderItem.subtotal"/></span>
                            </td>                   
                        </tr>
                </s:iterator>