先看看效果：
结算
list.jsp
<a href="javascript:jiesuan();" id="jiesuan"></a>
<form id="jieSuanForm" action="<c:url value='/CartItemServlet'/>" method="post"> <input type="hidden" name="cartItemIds" id="cartItemIds"/> <input type="hidden" name="total" id="hiddenTotal"/> <input type="hidden" name="method" value="loadCartItems"/></form>function jiesuan() { // 1. 获取所有被选择的条目的id，放到数组中 var cartItemIdArray = new Array(); $(":checkbox[name=checkboxBtn][checked=true]").each(function() { cartItemIdArray.push($(this).val());//把复选框的值添加到数组中 }); // 2. 把数组的值toString()，然后赋给表单的cartItemIds这个hidden $("#cartItemIds").val(cartItemIdArray.toString()); // 把总计的值，也保存到表单中 $("#hiddenTotal").val($("#total").text()); // 3. 提交这个表单 $("#jieSuanForm").submit();}servlet
public String loadCartItems(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { /* * 1. 获取cartItemIds参数 */ String cartItemIds = req.getParameter("cartItemIds"); double total = Double.parseDouble(req.getParameter("total")); /* * 2. 通过service得到List<CartItem> */ List<CartItem> cartItemList = cartItemService.loadCartItems(cartItemIds); /* * 3. 保存，然后转发到/cart/showitem.jsp */ req.setAttribute("cartItemList", cartItemList); req.setAttribute("total", total); req.setAttribute("cartItemIds", cartItemIds); return "f:/jsps/cart/showitem.jsp";}Dao
加载多个CartItem
public List<CartItem> loadCartItems(String cartItemIds) throws SQLException { /* * 1. 把cartItemIds转换成数组 */ Object[] cartItemIdArray = cartItemIds.split(","); /* * 2. 生成wehre子句 */ String whereSql = toWhereSql(cartItemIdArray.length); /* * 3. 生成sql语句 */ String sql = "select * from t_cartitem c, t_book b where c.bid=b.bid and " + whereSql; /* * 4. 执行sql，返回List<CartItem> */ return toCartItemList(qr.query(sql, new MapListHandler(), cartItemIdArray));}showitem.jsp
<c:choose> <c:when test="${empty cartItemList }">嘻嘻~</c:when> <c:otherwise> <form id="form1" action="<c:url value='/OrderServlet'/>" method="post"> <input type="hidden" name="cartItemIds" value="${cartItemIds }"/> <input type="hidden" name="method" value="createOrder"/> <table align="center" cellpadding="0" cellspacing="0"> <tr bgcolor="#efeae5"> <td colspan="5"><span style="font-weight: 900;">生成订单</span></td> </tr> <tr align="center"> <td> </td> <td>图书名称</td> <td>单价</td> <td>数量</td> <td>小计</td> </tr> <c:forEach items="${cartItemList }" var="cartItem"> <tr align="center"> <td align="right"> <a href="<c:url value='/jsps/book/desc.jsp'/>"><img align="top" src="<c:url value='/${cartItem.book.image_b }'/>"/></a> </td> <td align="left"> <a href="<c:url value='/jsps/book/desc.jsp'/>"><span>${cartItem.book.bname }</span></a> </td> <td>¥${cartItem.book.currPrice }</td> <td>${cartItem.quantity }</td> <td> <span>¥<span>${cartItem.subtotal }</span></span> </td> </tr> </c:forEach> <tr> <td colspan="6" align="right"> <span>总计：</span><span>¥<span id="total">${total }</span></span> </td> </tr> <tr> <td colspan="5" bgcolor="#efeae5"><span style="font-weight: 900">收货地址</span></td> </tr> <tr> <td colspan="6"> <input id="addr" type="text" name="address" value="北京市 昌平区 西三旗 金燕龙办公楼1层 传智播客 张三爷"/> </td> </tr> <tr> <td style="border-top-width: 4px;" colspan="5" align="right"> <a id="linkSubmit" href="javascript:$('#form1').submit();">提交订单</a> </td> </tr> </table> </form> </c:otherwise></c:choose>