<div id="main">
            <form action="manager/bookServlet" method="get">
                <%--${param.pageNo}等於request.getParameter("pageNo")
                    requestScope是從域中獲取
                    param從請求參數中獲取
                --%>
                <input type="hidden" name="pageNo" value="${param.pageNo}">
                <input type="hidden" name="action" value="${ empty param.id ? "add" : "update" }" />
                <input type="hidden" name="id" value="${ requestScope.book.id }" />
                <table>
                    <tr>
                        <td>名稱</td>
                        <td>價格</td>
                        <td>作者</td>
                        <td>銷量</td>
                        <td>庫存</td>
                        <td colspan="2">操作</td>
                    </tr>        
                    <tr>
                        <td><input name="name" type="text" value="${requestScope.book.name}"/></td>
                        <td><input name="price" type="text" value="${requestScope.book.price}"/></td>
                        <td><input name="author" type="text" value="${requestScope.book.author}"/></td>
                        <td><input name="sales" type="text" value="${requestScope.book.sales}"/></td>
                        <td><input name="stock" type="text" value="${requestScope.book.stock}"/></td>
                        <td><input type="submit" value="提交"/></td>
                    </tr>    
                </table>
            </form>
        </div>