struts2 <s:property value="">中进行计算

Question

<s:iterator value="slist">
<tr class="trmid">
<td align="center"><s:property value="matProjectItem.name"/></td>
<td align="center"><s:property value="oneLevel"/></td>
<td align="center"><s:property value="managementFee"/></td>
<td align="center"><s:property value="hydropowerFee"/></td>
<td align="center"><s:property value="instrumentFee"/></td>
<td align="center"><s:property value="peopleFee"/></td>
<td align="center"><s:property value="oneLevel-managementFee-hydropowerFee-instrumentFee-peopleFee"/></td>
</tr>
</s:iterator>
<s:property value="oneLevel-managementFee-hydropowerFee-instrumentFee-peopleFee"/>这块怎么写啊  我要进行减法运算

Answer 1

<s:property value="%{oneLevel-managementFee-hydropowerFee-instrumentFee-peopleFee}"/>必要条件：以上变量必须是数值类型属性。