<s:textfield>中使用request范围内值作为默认值问题

struts2在Action使用模型驱动 ??public?class?NewsAction?extends?BaseAction?implements?ModelDriven<News> ????获取News存入request范围内request..setAttribute("news",?news); ??在页面中获取方式： ??<s:textfield?name="biaoti"?label="标题"?value="%{#request.news.biaoti}"></s:textfield>??