标签：
一、流程分析
二、代码
1.view层
(1）list.jsp
<tr>
<td colspan="7" align="right">
<a href="javascript:jiesuan();" id="jiesuan" class="jiesuan"></a>
</td>
</tr>
</table>
<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>
/*
* 结算
*/
function jiesuan() {
// 1. 获取所有被选择的条目的id，放到数组中
var ids = new Array();
$("input[type=checkbox][name=checkboxBtn]:checked").each(function(index, domEl) {
ids.push($(domEl).val());
});
// 2. 把数组的值toString()，然后赋给表单的cartItemIds这个hidden
$("#cartItemIds").val(ids);
// 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();
}
(2)showitem.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 3 <%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %> 4 5 6 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 7 <html> 8 <head> 9 <title>showitem.jsp</title> 10 11 <meta http-equiv="pragma" content="no-cache"> 12 <meta http-equiv="cache-control" content="no-cache"> 13 <meta http-equiv="expires" content="0"> 14 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 15 <meta http-equiv="description" content="This is my page"> 16 <!-- 17 <link rel="stylesheet" type="text/css" href="styles.css"> 18 --> 19 <link rel="stylesheet" type="text/css" href="<c:url value=‘/jsps/css/cart/showitem.css‘/>"> 20 <script src="<c:url value=‘/jquery/jquery-1.5.1.js‘/>"></script> 21 <script src="<c:url value=‘/js/round.js‘/>"></script> 22 <style type="text/css"> 23 #addr{width: 500px; height: 32px;border: 1px solid #7f9db9; padding-left: 10px; line-height: 32px;} 24 </style> 25 26 <script type="text/javascript"> 27 //计算合计 28 $(function() { 29 var total = 0; 30 $(".subtotal").each(function() { 31 total += Number($(this).text()); 32 }); 33 //$("#total").text(round(total, 2)); 34 }); 35 </script> 36 </head> 37 38 <body> 39 <form id="form1" action="<c:url value=‘/jsps/order/ordersucc.jsp‘/>" method="post"> 40 <input type="hidden" name="cartItemIds" value=""/> 41 <input type="hidden" name="method" value=""/> 42 <table width="95%" align="center" cellpadding="0" cellspacing="0"> 43 <tr bgcolor="#efeae5"> 44 <td width="400px" colspan="5"><span style="font-weight: 900;">生成订单</span></td> 45 </tr> 46 <tr align="center"> 47 <td width="10%"> </td> 48 <td width="50%">图书名称</td> 49 <td>单价</td> 50 <td>数量</td> 51 <td>小计</td> 52 </tr> 53 54 55 <c:forEach items="${items }" var="item"> 56 <tr align="center"> 57 <td align="right"> 58 <a class="linkImage" href="<c:url value=‘/jsps/book/desc.jsp‘/>"><img border="0" width="54" align="top" src="<c:url value=‘${item.book.image_b }‘/>"/></a> 59 </td> 60 <td align="left"> 61 <a href="<c:url value=‘/jsps/book/desc.jsp‘/>"><span>${item.book.bname }</span></a> 62 </td> 63 <td>¥${item.book.currPrice }</td> 64 <td>${item.quantity }</td> 65 <td> 66 <span class="price_n">¥<span class="subtotal">${item.subtotal }</span></span> 67 </td> 68 </tr> 69 </c:forEach> 70 71 <tr> 72 <td colspan="6" align="right"> 73 <span>总计：</span><span class="price_t">¥<span id="total">${total }</span></span> 74 </td> 75 </tr> 76 <tr> 77 <td colspan="5" bgcolor="#efeae5"><span style="font-weight: 900">收货地址</span></td> 78 </tr> 79 <tr> 80 <td colspan="6"> 81 <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"/> 82 </td> 83 </tr> 84 <tr> 85 <td style="border-top-width: 4px;" colspan="5" align="right"> 86 <a id="linkSubmit" href="javascript:$(‘#form1‘).submit();">提交订单</a> 87 </td> 88 </tr> 89 </table> 90 </form> 91 </body> 92 </html>
2.servlet层
(1）CartItemServlet.java
1 /** 2 * 加载多个CartItem 3 * @param req 4 * @param resp 5 * @return 6 * @throws ServletException 7 * @throws IOException 8 */ 9 public String loadCartItems(HttpServletRequest req, HttpServletResponse resp) 10 throws ServletException, IOException { 11 // 1. 获取cartItemIds参数 12 String ids = req.getParameter("cartItemIds"); 13 double total = Double.parseDouble(req.getParameter("total")); 14 // 2. 通过service得到List<CartItem> 15 List<CartItem> items = service.loadCartItems(ids); 16 // 3. 保存，然后转发到/cart/showitem.jsp 17 req.setAttribute("items", items); 18 req.setAttribute("total", total); 19 req.setAttribute("cartItemIds", ids); 20 return "f:/jsps/cart/showitem.jsp"; 21 22 }
3.service层
(1）CartitemService.java
1 /** 2 * 加载多个CartItem 3 * @param ids 4 * @return 5 */ 6 public List<CartItem> loadCartItems(String ids) { 7 try { 8 return dao.loadCartItems(ids); 9 } catch (SQLException e) { 10 throw new RuntimeException(e); 11 } 12 }
4.dao层
(1）CartItemDao.java
1 /** 2 * 加载多个CartItem 3 * @param ids 4 * @return 5 * @throws SQLException 6 */ 7 public List<CartItem> loadCartItems(String ids) throws SQLException { 8 String [] idsArray = ids.split(","); 9 String sql = "select * from t_cartItem c, t_book b where c.bid=b.bid and cartItemid in " + toWhereSql(idsArray.length); 10 List<Map<String,Object>> mapList = qr.query(sql, new MapListHandler(), idsArray); 11 return toCartItemList(mapList); 12 }
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原文地址：http://www.cnblogs.com/shamgod/p/5169634.html
