Spring mvc 在SpringMVC中引用jsp中的命令对象

我是SpringMVC。我的控制器类扩展了AbstractWizardFormController类

我的命令对象UpdateStockBean包含列表

public class UpdateStockBean {
@SuppressWarnings("rawtypes")
private List dimensionStones =
    LazyList.decorate(new ArrayList(),FactoryUtils.instantiateFactory(DimensionStoneBean.class));
String productiondate;
long openbalance;

public UpdateStockBean() {
    super();
}

@SuppressWarnings("rawtypes")
public List getDimensionStones() {
    return dimensionStones;
}
public void setDimensionStones(@SuppressWarnings("rawtypes") List dimensionStones) {
    this.dimensionStones = dimensionStones;

}
}

我已被用于表单备份对象来填充JSP中的字段。它看起来像下面

protected Object formBackingObject(HttpServletRequest request)throws Exception {

            UpdateStockBean updateStockBean=new UpdateStockBean();

            updateStockBean.setDimensionStones(dimensionStoneBeans);//here dimensionStoneBeans is a list

    return updateStockBean;
    }

我的问题在我的jsp中

 <c:forEach items="${updateStockBean.dimensionStones}" var="DimensionStones" varStatus="i" begin="0">
              <tr class="dimensionStone">    
                 <td><form:input path="dimensionStones[${i.index}].stoneNo" id="stoneNo${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].length" id="length${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].breadth" id="breadth${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].height" id="height${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].dimension" id="dimension${i.index}" cssClass="controlStock"/></td>                 
                 <td><form:checkbox path="dimensionStones[${i.index}].isIssued" id="isIssued${i.index}" cssClass="check"/></td>
                 <td><a href="#" class="removeDimensionStone"><img src="images/plus3.png" width="20" height="20" title="Remove Dimension Stone"/></a></td>
              </tr>
            </c:forEach>  
            <c:if test="${empty updateStockBean.dimensionStones}">
                <tr class="dimensionStone defaultRow">    
                            <td><input type="text" name="dimensionStones[].stoneNo" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].length" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].breadth" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].height" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].dimension" value="" Class="controlStock"/></td>                            
                            <td><input type="checkbox" name="dimensionStones[].isIssued" value="Yes" Class="controlStock"/></td> 
                            <td><a href="#" class="removeDimensionStone"><img src="images/cross1.jpg" width="20" height="20" title="Remove Dimension Stone"/></a></td>
                        </tr>
            </c:if>

${updateStockBean.dimensionStones}为空。如何在我的jsp中引用由formBacking（）方法填充的updateStockBean对象。请解决我的问题

servlet配置如下所示

<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
 <property name="mappings">
    <props>
      <prop key="updateStock.nic">UpdateStockController</prop>
    <props>
 </property>
</bean>

<bean id="UpdateStockController" class="mams.web.UpdateStockController">
    <property name="commandName"><value>updateStock</value></property>
    <property name="commandClass"><value>nic.mams.web.beans.UpdateStockBean</value>
    </property>
    <property name="stockRegisterService" ref="StockRegisterService"></property>
    <property name="dimensionStoneService" ref="DimensionStoneService"></property>
    <property name="validator" ref="UpdateStockValidator"></property>
    <property name="pages">
    <list>      
          <value>addOrEditOpenDimensionStone</value> //this value corresponds to my jsp
    </list>
    </property>
    </bean>

UpdateStockController
updateStock
nic.mams.web.beans.UpdateStockBean
addOrEditOpenDimensionStone//此值对应于我的jsp

此处updateStockBean.dimensionStones，updateStockBean必须是命令名，而不是formbackingObject（）方法返回的对象名。即

<form commandname="updateStock">

<c:forEach items="${updateStock.dimensionStones}" var="DimensionStones" varStatus="i" begin="0">
              <tr class="dimensionStone">    
                 <td><form:input path="dimensionStones[${i.index}].stoneNo" id="stoneNo${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].length" id="length${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].breadth" id="breadth${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].height" id="height${i.index}" cssClass="controlStock"/></td>
                 <td><form:input path="dimensionStones[${i.index}].dimension" id="dimension${i.index}" cssClass="controlStock"/></td>                 
                 <td><form:checkbox path="dimensionStones[${i.index}].isIssued" id="isIssued${i.index}" cssClass="check"/></td>
                 <td><a href="#" class="removeDimensionStone"><img src="images/plus3.png" width="20" height="20" title="Remove Dimension Stone"/></a></td>
              </tr>
            </c:forEach>  
            <c:if test="${empty updateStock.dimensionStones}">
                <tr class="dimensionStone defaultRow">    
                            <td><input type="text" name="dimensionStones[].stoneNo" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].length" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].breadth" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].height" value="" Class="controlStock"/></td>
                            <td><input type="text" name="dimensionStones[].dimension" value="" Class="controlStock"/></td>                            
                            <td><input type="checkbox" name="dimensionStones[].isIssued" value="Yes" Class="controlStock"/></td> 
                            <td><a href="#" class="removeDimensionStone"><img src="images/cross1.jpg" width="20" height="20" title="Remove Dimension Stone"/></a></td>
                        </tr>
            </c:if>
</form>