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給c:forEach中select和oprtion設定預設選項

 <select name="categoryid" style="height: 35px;width: 200px">
                            <c:forEach items="${categorylist}" var="list">
                                <option value='${list.categoryid}' <c:if
                                        test="${data.categoryid==list.categoryid}"> selected="selected" </c:if>>
                                ${list.catename}</option>
                            </c:forEach>

                        </select>