ResultSet fl = st.executeQuery("select * from tbl_category");
            List list = new ArrayList();
            while(fl.next()){
                list.add(fl.getString("cname"));
            }
            request.setAttribute("fllist", list);
            request.getRequestDispatcher("five4.jsp").forward(request, response);

<logic:present name="fllist">
//迭代循环
<logic:iterate id="fllist" name="fllist">
<tr>
<td align="center"><bean:write name="fllist" property="userName" /></td>
</tr>
</logic:iterate>
</logic:present>

------解决方案--------------------
其实很简单:
List list= (List) request.getAttribute("fllist");