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>