Struts2action间的跳转参数传不过去？

Question

    <!-- 修改警员资料 -->
        <action name="police_update" class="yh.position.action.center.PoliceUpdateAction"
            method="update">
            <result name="success" type="redirectAction">
                <param name="actionName">police_lookInfo</param>
                <param name="policeId">${policeId}</param>
            </result>
        </action>

其中policeId是long 两个action都有get set方法