//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"));}//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usernamesession.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 + "' 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 + "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%＞&curpage=＜%=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"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＞＜tableborder="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＞＜td width="122" height="7" style="border: medium" align="center"＞＜div align="center"＞＜center＞＜tableborder="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＞＜tableborder="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_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＞＜tableborder="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＞＜/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＞＜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));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＞＜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＞＜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!");}%＞注意应在使用后将rs关闭。以下是bka.java的源程序。注意在使用前需用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;}}
