在action里servletRequest.setAttribute(“survey“,survey);
jsp文件片断（注意：不需usebean，标签会自动找）：
<nested:write name="survey" property="title"/><br>
<nested:write name="survey" property="poster"/><br>
<nested:write name="survey" property="postDate"/><br>
<nested:iterate id="item" name="survey" property="items" type="survey.SurveyItem">
<nested:equal name="item" property="type" value="select_single">
<nested:write property="title"/><br>
options:<br>
<nested:iterate id="option" name="item" property="options" type="survey.SurveyItemOption">
<nested:write property="index"/>
<nested:write property="text"/><br>
</nested:iterate>
</nested:equal>
<nested:equal name="item" property="type" value="select_multi">
<nested:write property="title"/><br>
options:<br>
<nested:iterate id="option" name="item" property="options" type="survey.SurveyItemOption">
<nested:write property="index"/>
<nested:write property="text"/><br>
</nested:iterate>
</nested:equal>
<nested:equal name="item" property="type" value="text">
<nested:write property="title"/><br>
</nested:equal>
</nested:iterate>
