java网上图书商城（5）购物车模块2

<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();
}

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";
}

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));
}

<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 width="95%" align="center" cellpadding="0" cellspacing="0">
  <tr bgcolor="#efeae5">
   <td width="400px" colspan="5"><span style="font-weight: 900;">生成订单</span></td>
  </tr>
  <tr align="center">
   <td width="10%"> </td>
   <td width="50%">图书名称</td>
   <td>单价</td>
   <td>数量</td>
   <td>小计</td>
  </tr>
 
  <c:forEach items="${cartItemList }" var="cartItem">
  <tr align="center">
   <td align="right">
   <a class="linkImage" href="<c:url value='/jsps/book/desc.jsp'/>"><img border="0" width="54" align="top" src="<c:url value='/${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>${cartItem.quantity }</td>
   <td>
   <span class="price_n">¥<span class="subtotal">${cartItem.subtotal }</span></span>
   </td>
  </tr>
  </c:forEach>
  
  <tr>
   <td colspan="6" align="right">
   <span>总计：</span><span class="price_t">¥<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>