Java 如何用foreach绑定jstl表单输入？

我正在向jsp传递一个自定义对象。如何将输入标记绑定到它，记住这个自定义类有列表作为字段？ JSP表单：

<f:form method="POST" action="${url_save}" modelAttribute="sprav">
<tr>
  <c:forEach var="columnName" items="${sprav.columnName}">                                           
  <td><f:input path="${columnName}"></f:input></td>                                      
 </c:forEach>
</tr>
</f:form>

public class Spravochnik extends BaseEntity {

    private List<String> columnName;
    private List<List<String>> valuesInRows;
    public List<String> getColumnName() {
        return columnName;
    }
    public void setColumnName(List<String> columnName) {
        this.columnName = columnName;
    }
    public List<List<String>> getValuesInRows() {
        return valuesInRows;
    }
    public void setValuesInRows(List<List<String>> valuesInRows) {
        this.valuesInRows = valuesInRows;
    }



}

    @RequestMapping(value = "/edit", method = { RequestMethod.POST, RequestMethod.GET })
    public ModelAndView edit(@RequestParam("id") String id, ModelMap model) {
        Spravochnik sprav = spravochnikService.selectOne(id);

        model.addAttribute("sprav", sprav);

        return new ModelAndView("edit", model);
    }