Data binding Spring MVC 3-绑定模型元素中对象列表的属性

我有一个JSP生成的表单，需要向用户提供一个选项列表。其中一些是单实例选项，例如是否生成目录，这样做很好。我现在需要添加一个下级选项列表，并允许用户打开或关闭每个选项。我可以在JSP页面中生成选项列表，并为每个选项提供一个唯一的ID。我希望在表单中用一个元素表示一个选项

选项类如下所示：

// Option class
public class PdfCatalogOptions
{
    private boolean isTableOfContentsIncluded;
    private List<ProductGroup> productGroups;

    public boolean getTableOfContentsIncluded () {
        return isTableOfContentsIncluded;
    }    

    public PdfCatalogOptions setTableOfContentsIncluded ( final boolean isTableOfContentsIncluded ) {
        this.isTableOfContentsIncluded = isTableOfContentsIncluded;
        return this;
    }

    public List<ProductGroup> getProductGroups() {
        return productGroups;
    }

    public PdfCatalogOptions setProductGroups( final List<ProductGroup> setProductGroups ) {
        this.productGroups = productGroups;
        return this;
    }
}

public class ProductGroup
{
    private String  groupName;
    private boolean isSelected;

    public String getGroupName () {
        return groupName;
    }

    public ProductGroup setGroupName ( final String groupName ) {
        this.groupName = groupName;
        return this;
    }

    public Boolean getIsSelected () {
        return isSelected;
    }

    public ProductGroup setIsSelected ( final boolean selected ) {
        isSelected = selected;
        return this;
    }
}

<form:form action="generateCatalog.do" commandName="options">
    <table>
        <tr>
            <td colspan="3"><form:errors cssClass="error"/></td>
        </tr>
        <tr>
            <td><spring:message code="catalog.include.toc"/></td>
            <td><form:checkbox path="tableOfContentsIncluded"/></td>
        </tr>
        <tr>
            <td>&nbsp;</td>
        </tr>
        <c:forEach items="options.productGroups" var="productGroup">
            <tr>
                <td>&nbsp;</td>
                <td><form:checkbox path="productGroup.isSelected"/>blah</td>
            </tr>
        </c:forEach>
    </table>
</form:form>

在控制器内的get处理程序中，我执行以下操作：

@RequestMapping( method = RequestMethod.GET )
public String get ( final Model model ) throws Exception {
    model.addAttribute ( "options", new PdfCatalogOptions ().setProductGroups ( buildProductGroupList () ) );
    return FormName.GENERATE_CATALOG;
}

buildProductGroupList中的逻辑无关紧要——它只生成一个ProductGroup对象的ArrayList，其中填充了我需要的数据

我遇到的问题是，我似乎无法说服Spring绑定到PdfCatalogOptions对象中各个ProductGroup对象内的字段

JSP如下所示：

// Option class
public class PdfCatalogOptions
{
    private boolean isTableOfContentsIncluded;
    private List<ProductGroup> productGroups;

    public boolean getTableOfContentsIncluded () {
        return isTableOfContentsIncluded;
    }    

    public PdfCatalogOptions setTableOfContentsIncluded ( final boolean isTableOfContentsIncluded ) {
        this.isTableOfContentsIncluded = isTableOfContentsIncluded;
        return this;
    }

    public List<ProductGroup> getProductGroups() {
        return productGroups;
    }

    public PdfCatalogOptions setProductGroups( final List<ProductGroup> setProductGroups ) {
        this.productGroups = productGroups;
        return this;
    }
}

public class ProductGroup
{
    private String  groupName;
    private boolean isSelected;

    public String getGroupName () {
        return groupName;
    }

    public ProductGroup setGroupName ( final String groupName ) {
        this.groupName = groupName;
        return this;
    }

    public Boolean getIsSelected () {
        return isSelected;
    }

    public ProductGroup setIsSelected ( final boolean selected ) {
        isSelected = selected;
        return this;
    }
}

<form:form action="generateCatalog.do" commandName="options">
    <table>
        <tr>
            <td colspan="3"><form:errors cssClass="error"/></td>
        </tr>
        <tr>
            <td><spring:message code="catalog.include.toc"/></td>
            <td><form:checkbox path="tableOfContentsIncluded"/></td>
        </tr>
        <tr>
            <td>&nbsp;</td>
        </tr>
        <c:forEach items="options.productGroups" var="productGroup">
            <tr>
                <td>&nbsp;</td>
                <td><form:checkbox path="productGroup.isSelected"/>blah</td>
            </tr>
        </c:forEach>
    </table>
</form:form>

有人能给我指一下正确的方向吗

编辑1：正确列出所有产品组：

<c:forEach items="${options.productGroups}" var="pg">
    <tr>
        <td>${pg.groupName}</td>
    </tr>
</c:forEach>

这些值就在那里，并按照我的预期显示。但是，我不能做的是找到一种将值路径绑定到复选框的方法。如果我加上，我被告知pg不是PdfCatalogOptions的属性

---

如果我添加，那么我会被告知（某种程度上是可以预测的）true不是PdfCatalogOptions的属性。

错误是意料之中的。PdfCatalogOptions中没有productGroup字段。它是ProductGroups productGroup是c:forEach循环变量。请检查生成的html。如果输入的类型复选框的名称包含productGroup而不是productGroups，则显然会发生此错误。@Andrew:您找到此问题的解决方案了吗？？我也面临同样的问题。