用JSP和数据库做的购物车的源程序

下面是我用JSP和数据库做的购物车的源程序：

//shop_cart.jsp <%@ page contentType="text/html;charset=gb2312"%> <%@ page session="true" %> <%@ page language="java" import="java.sql.*" %> <jsp:useBean id="bka" scope="page" class="shop.bka" /> <% String product_type; String action; int product_id; int curpage; //商品类型 if (request.getParameter("product_type")==null){ product_type="all"; }else{ product_type=request.getParameter("product_type"); } //页数和商品类型参数，可以在“继续购物”时返回到上次购物的页面 if (request.getParameter("curpage")==null){ curpage=1; }else{ curpage=java.lang.Integer.parseInt(request.getParameter("curpage")); } 复制于jc567.cn //动作 if (request.getParameter("action")==null){ action="view"; }else{ action=request.getParameter("action"); } //商品编号 if (request.getParameter("product_id")==null){ product_id=0; }else{ product_id=java.lang.Integer.parseInt(request.getParameter("product_id")); } int bbb; bbb=1; Integer num = new Integer(bbb); //商店编号 session.putValue("shop_id",num); //顾客username session.putValue("guest_name","asp2001"); String guest_name=(String)session.getValue("guest_name"); Integer shop_id=(Integer)session.getValue("shop_id"); java.lang.String sql; java.sql.ResultSet rs; if (action.compareTo("add")==0) { sql="select cart_quantity from shop_cart where cart_shop_id=" shop_id " and cart_guest_id='" guest_name "' jc567.cn and cart_product_id=" product_id ; rs = bka.executeQuery(sql); if (rs.next()){ int cart_quantity; cart_quantity=java.lang.Integer.parseInt(rs.getString("cart_quantity")) 1; sql="update shop_cart set cart_quantity=" cart_quantity " where cart_shop_id=" shop_id " and cart_guest_id='" guest_name "' and cart_product_id=" product_id ; rs = bka.executeQuery(sql);} else { sql="insert into shop_cart (cart_shop_id,cart_guest_id, cart_product_id,cart_quantity) values ('" shop_id "','" guest_name "','" product_id "',1)"; rs = bka.executeQuery(sql); } } if (action.compareTo("clear")==0) { sql="delete from shop_cart where cart_shop_id=" shop_id " and cart_guest_id='" guest_name "'"; rs = bka.executeQuery(sql); } if (action.compareTo("delete")==0) { sql="delete from shop_cart where cart_shop_id=" shop_id " www.hot007.com and cart_guest_id='" guest_name "' and cart_product_id=" product_id ; rs = bka.executeQuery(sql); } %> <div align="center"><center> <table border="0" cellpadding="0" cellspacing="0" width="610" height="2"> <tr> <td><form method="POST" action="shop_cart.jsp?action=update&product_type=<%=product_type%>&curp age=<%=curpage%>"> <table border="0" cellpadding="0" cellspacing="0" width="610" height="2"> <tr> <td width="122" height="7"><div align="center"><center><table border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468" bordercolordark="#FFFFFF" www.jc567.cn bgcolor="#FFB468"> <tr> <td width="100%"><div align="center"><center><p>购物车</td> </tr> </table> </center></div></td> <td width="122" height="7" style="border: medium" align="center"><div align="center"><center><table border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468" bordercolordark="#FFFFFF" bgcolor="#FFB468"> <tr> <td width="100%"><div align="center"><center><p><a href="shop_list.jsp?shop_id=<%=shop_id%>&product_type=<%=product_type%> &curpage=<%=curpage%>">继续购物</a></td> </tr> </table> </center></div></td> 复制于hot007.com <td width="122" height="7" style="border: medium" align="center"><div align="center"><center><table border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468" bordercolordark="#FFFFFF" bgcolor="#FFB468"> <tr> <td width="100%"><div align="center"><center><p><a href="javascript: document.forms[0].submit()">重新计费</a></td> </tr> </table> </center></div></td> <td width="122" height="7" style="border: medium" align="center"><div align="center"><center><table border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468" hot007.com bordercolordark="#FFFFFF" bgcolor="#FFB468"> <tr> <td width="100%"><div align="center"><center><p> <a href="shop_cart.jsp?action=clear&product_type=<%=product_type%>&curpage= <%=curpage%>">清空购物车</a></td> </tr> </table> </center></div></td> <td width="122" height="7" style="border: medium" align="center"> <div align="center"><center><table border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468" bordercolordark="#FFFFFF" bgcolor="#FFB468"> <tr> <td width="100%"><div align="center"><center><p> <a href="shop_order.asp">确认购买</a></td> </tr> jc567.cn </table> </center></div></td> </tr> <tr align="center"> <td width="610" height="1" colspan="5"><div align="center"><center> <table border="1" cellpadding="2" cellspacing="0" width="100%" bgcolor="#FDFEE2" bordercolorlight="#FFB468" bordercolordark="#FFFFFF" height="40"> <tr> <td width="20%" height="8" align="left">商品名称</td> <td width="10%" height="8" align="left">市场价</td> <td width="10%" height="8" align="left">优惠价</td> <td width="10%" height="8" align="left">数量</td> <td width="14%" height="8" align="left">小计</td> <td width="12%" height="8" align="left">定金比例</td> 文章来源于www.hot007.com <td width="17%" height="8" align="left">定金小计</td> <td width="17%" height="8" align="left">删除</td> </tr> <% sql="select shop_product.product_id,shop_product.product_name, shop_product.product_price,shop_product.product_discount, shop_cart.cart_quantity,shop_product.product_first from shop_cart, shop_product where shop_cart.cart_shop_id=" shop_id " and shop_cart.cart_guest_id='" guest_name "' and shop_cart.cart_product_id=shop_product.product_id"; rs = bka.executeQuery(sql); int total; int total_first; total=0; total_first=0; String product_name; int product_price; int product_discount; int product_first; int cart_quantity; if (rs.next()){ while (rs.next()) { product_id=java.lang.Integer.parseInt(rs.getString(1)); product_name=rs.getString(2); product_price=java.lang.Integer.parseInt(rs.getString(3)); www.hot007.com product_discount=java.lang.Integer.parseInt(rs.getString(4)); cart_quantity=java.lang.Integer.parseInt(rs.getString(5)); product_first=java.lang.Integer.parseInt(rs.getString(6)); %> <tr> <td width="10%" height="1" align="left"><%=product_name%></td> <td width="10%" height="1" align="left"><%=product_price%></td> <td width="10%" height="1" align="left"><%=product_discount%></td> <td width="10%" height="1" align="left"> <input type="text" name="<%= "t" product_id %>" size="3" value="<%=cart_quantity%>"></td> <td width="14%" height="1" align="left"> <%=product_discount*cart_quantity%></td> <td width="12%" height="1" align="left"><%=product_first "%"%></td> jc567.cn <td width="17%" height="1" align="left"> <%=product_first*product_discount*cart_quantity/100.0%></td> <td width="17%" height="1"><div align="center"><center><p> <a href="shop_cart.jsp?action=delete&product_id=<%=product_id%>"> delete</a></td> </tr> <% total=total product_discount*cart_quantity; total_first=total_first product_discount*cart_quantity*product_first/100; } %> <tr align="center"> <td width="72%" colspan="6" height="16"><div align="right"><p>总计</td> <td width="36%" colspan="2" height="16"><div align="left"><%=total%></td> </tr> <tr align="center"> <td width="72%" colspan="6" height="16"><div align="right"><p>定金总计</td> hot007.com <td width="36%" colspan="2" height="16"><div align="left"><%=total_first%></td> </tr> <tr align="center"> <td width="72%" colspan="6" height="16"><div align="right"> <p>结余</td> <td width="36%" colspan="2" height="16"><div align="left"> <%=total-total_first%></td> </tr> </table> </center></div> <% }else{ %> <p align="center">购物车为空!</p> <% } %>

数据库操作部分

程序用到两个表：
1 shop_cart表
cart_id int 购物车编号 自动编号
cart_shop_id nvarchar 商店编号
cart_product_id nvarchar 商品编号
cart_quantity int 商品数量
临时存放购物车数据

2 shop_product表
product_id int 商品编号 自动编号
shop_id nvarchar 商店编号
product_name nvarchar 商品名称
product_bb nvarchar 商品介绍
product_price int 市场价
product_discount int 优惠价
product_img img 图片
product_status nvarchar 状态
product_first int 定金比例
product_type nvanchar 商品类型
存放商品资料

使用bka.java制成的javabean：bka.class可以提供对数据库的操作。

另外，需在控制面板的系统DSN中注册bka.dsn，
从而可使JSP通过JDBC-ODBC来调用sql数据库。
在页面中调用javabean，基本上可采用以下方式：

<%@ page language="java" import="java.sql.*" %> <jsp:useBean id="RegisterBean" scope="page" class="shop.bka" /> <% String sql="select * from xxx"; ResultSet rs = RegisterBean.executeQuery(sql); if(rs.next()) { rs.close(); RegisterBean.closeStmt(); session.putValue("register_message","duplicate name found!"); www.hot007.com } %> 注重应在使用后将rs关闭。 以下是bka.java的源程序。注重在使用前需用javac加以编译成为class文件即javabean. --shop/bka.java-- package shop; import java.sql.*; public class bka { String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver"; String sConnStr = "jdbc:odbc:bka"; Connection conn = null; ResultSet rs = null; public bka() { try { Class.forName(sDBDriver); } catch(java.lang.ClassNotFoundException e) { System.err.println("bka(): " e.getMessage()); } } public ResultSet executeQuery(String sql) { rs = null; try { conn = DriverManager.getConnection(sConnStr,"xxx","yyy"); Statement stmt = conn.createStatement(); rs = stmt.executeQuery(sql); } catch(SQLException ex) { System.err.println("aq.executeQuery: " ex.getMessage()); } return rs; } }

复制于hot007.com