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用JSP和数据库实现购物车的源程序 //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“继承购物”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 + " 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%> &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" 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%>">继承购物</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="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" 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> </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法： <%@ 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; } } 返回类别: 教程 上一教程: JAVA语言中字符的处理 下一教程: JSP语法 您可以阅读与"用JSP和数据库实现购物车的源程序"相关的教程: · JSP实现购物程序 · JSP+BEANS实现读取数据库的例子 · 应用JDOM处理数据库到XML转变的JSP实现 · 一个用数据库实现的工作流 · 一个向数据库存取IMAGE文件的JSP程序 |
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