<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>