树形dgCol列怎么引用TreeGrid.attributes中的值

zesen2008

请高手指点
页面代码：  
< t:datagrid name="venGoodsSortList" title="商器类型" actionUrl="venGoodsSortController.do?datatreegrid" idField="id" treegrid="true" pagination="false" fit="true">
....
    <t:dgCol title="拼音编码" field="gsSpell" treefield="attributes.get('gsSpell')" width="80"></t:dgCol>
....

后台代码：
@RequestMapping(params = "datatreegrid")
@ResponseBody
public List<TreeGrid> datatreegrid(HttpServletRequest request, TreeGrid treegrid) {
   CriteriaQuery cq = new CriteriaQuery(VenGoodsSortEntity.class);
   if(treegrid.getId() == null)
    cq.add(Restrictions.isNull("gsParentSort.id"));
   else
    cq.add(Restrictions.eq("gsParentSort.id", treegrid.getId()));
   List<VenGoodsSortEntity> goodSortList = venGoodsSortService.getListByCriteriaQuery(cq, false);
   List<TreeGrid> treeGrids = new ArrayList<TreeGrid>();
   for(VenGoodsSortEntity goodSort: goodSortList) {
    TreeGrid tg = new TreeGrid();
    tg.setId(goodSort.getId());
    if(goodSort.getGsParentSort() == null) {
     tg.setParentId(null);
     tg.setParentText("");
    }
    else {
     tg.setParentId(goodSort.getGsParentSort().getId());
     tg.setParentText(goodSort.getGsParentSort().getGsName());   
    }
    tg.setCode(goodSort.getGsCode());
    tg.setText(goodSort.getGsName());
    Map<String, String> map = new HashMap<String, String>();
    tg.setAttributes(map);
    map.put("gsSpell", goodSort.getGsSpell());
   
    tg.setState("closed");
    treeGrids.add(tg);
   }
   return treeGrids;
}