如果java有值则在页面显示下拉框，如果没值则什么都不显示，用s:if 实现

<s:if test=" null== #request.parentMap||#request.parentMap.isEmpty() "></s:if>
    <s:else>
    <li class="JS-industryWrap">
     <label for="companydepartid"><s>*</s>部门</label>
                    <select name="userToAdd.companydepartid"  datatype = "select" errormsg="请选择部门名称">
                     <option value="">== 请选择部门 ==</option>
                     <s:iterator value="#request.parentMap" >
             <option value="<s:property  value="key" />"><s:property escape="false"  value="value"/></option>
         </s:iterator>
                    </select>
                    <span class="Validform_checktip"></span>
    </li>
    </s:else>