struts传值异常，action接收到的值为null
jsp中的原来代码：
<s:iterator value="#request.all" id="person"><tr><td><a href="Person-showPerson?person.id=<s:property value='#person.id'/>"><s:property value="#person.id"/></a></td><td><s:property value="#person.name"/></td><td><s:property value="#person.idcard"/></td><td><a href="Person-delete?id=<s:property value='#person.id'/>">删除</a></td><td><a href="person/Person-update.jsp?id=<s:property value='#person.id'/>">更新</a></td></tr></s:iterator>
<td><a href="Person-showPerson?id=<s:property value='#person.id'/>"><s:property value="#person.id"/></a></td>
