struts2 iterator 嵌套循环，内iterator取外iterator的属性....

<s:iterator value="groupsList" var="st">

<s:iterator value="userList">

<input type="checkbox" name="giveUsers" id="users" value="${st.id}-${id}"/>${loginName}

</s:iterator>

</s:iterator>

${st.id}是当前外iterator的ID，${id}是内iterator的ID

List<Double> incomeList = Lists.newArrayList();

<s:iterator value="incomeList" id="offset">

<td>

<s:property value="#offset"/>

</td>

</s:iterator>