JSP实例购物车
index.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <%@ page import="java.sql.*"%>
<html> <head> <title>在线购物</title> </head> <% //装载MySQL5.0的JDBC驱动 Class.forName("com.mysql.jdbc.Driver").newInstance(); //建立数据库连接 String url ="jdbc:mysql://localhost:3306/eshop?user=root&password=zhz&useUnicode=true&characterEncoding=gb2312"; Connection conn= DriverManager.getConnection(url); //建立一个Statement对象，用于执行SQL语句 Statement stat = conn.createStatement(); //执行查询并得到查询结果 String sql = "select * from shop"; ResultSet rs = stat.executeQuery(sql); %> <body> <h2>在线购物</h2> <hr> <table border="1" width="600"> <tr bgcolor="#dddddd"> <td align="center" width="80">商品缩图</td> <td align="center">商品摘要</td> <td align="center" width="100">在线购买</td> </tr> <% String bm,name,price,info,img; //将查询结果集中的记录输出到页面上 while (rs.next()){ //从当前记录中读取各字段的值 img = rs.getString("SP_PIC").trim(); bm = rs.getString("SP_NO").trim(); name = rs.getString("SP_NAME").trim(); price = rs.getString("SP_PRICE").trim(); info = rs.getString("SP_INFO").trim();
out.println("<tr>"); out.println("<td><img src='"+ img +"' border=0 height=60 width=60></td>"); out.println("<td>"); out.println("商品编号："+ bm +"<br>"); out.println("商品名称："+ name +"<br>"); out.println("商品价格："+ price +"元<br>"); out.println("商品简介："+ info +"<br>"); out.println("</td>"); out.println("<td><a href='buy.jsp?op=add&bm="+bm+"'>放入购物车</a></td>"); out.println("</tr>"); } %> </table> <br> <a href="cart.jsp">查看购物车</a> <a href="buy.jsp?op=clear">清空购物车</a> </body> </html> |
cart.jsp
| <%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <%@ page import="java.sql.*"%>
<html> <head> <title>我的购物车</title> </head> <% //装载MySQL5.0的JDBC驱动 Class.forName("com.mysql.jdbc.Driver").newInstance(); //建立数据库连接 Stringurl="jdbc:mysql://localhost:3306/eshop?user=root&password=zhz&useUnicode=true&characterEncoding=gb2312"; Connection conn= DriverManager.getConnection(url); //建立一个Statement对象，用于执行SQL语句 Statement stat = conn.createStatement(); //执行查询并得到查询结果 String sql = "select * from cart"; ResultSet rs = stat.executeQuery(sql); %> <body> <h2>我的购物车</h2> <hr> <table border="1" width="600"> <tr bgcolor="#dddddd"> <td align="center" width="80">商品名称</td> <td align="center">商品单价</td> <td align="center" width="100">购买数量</td> <td align="center" width="100">金额</td> <td align="center" width="100">编辑</td> </tr> <% String id,name,price,num,count; //将查询结果集中的记录输出到页面上 while (rs.next()){ //从当前记录中读取各字段的值 id = rs.getString("ID").trim(); name = rs.getString("SP_NAME").trim(); price = rs.getString("SP_PRICE").trim(); num = rs.getString("BUY_NUM").trim(); count = rs.getString("COUNT").trim();
out.println("<tr>"); out.println("<td>"+ name +"</td>"); out.println("<td>"+ price +"</td>"); out.println("<td><input type=text value="+ num +" onChange=/"updateNum('"+id+"',this.value,'"+price+"')/"></td>"); out.println("<td>"+ count +"</td>"); out.println("<td><a href='buy.jsp?op=del&id="+id+"'>退回商品架</a></td>"); out.println("</tr>"); } %> </table> <br> <a href="index.jsp">继续购物</a> <a href="buy.jsp?op=clear">清空购物车</a> </body> <script language="javascript"> function updateNum(id,num,price){ var url = "buy.jsp?op=update&id="+id+"&num="+num+"&price="+price; window.location = url; } </script> </html> |
buy.jsp
| <%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <%@ page import="java.sql.*"%> <% //装载MySQL5.0的JDBC驱动 Class.forName("com.mysql.jdbc.Driver").newInstance(); //建立数据库连接 String url ="jdbc:mysql://localhost:3306/eshop?user=root&password=zhz&useUnicode=true&characterEncoding=gb2312"; Connection conn= DriverManager.getConnection(url); PreparedStatement pstat = null; ResultSet rs = null;
String sql = null; String op = request.getParameter("op");
//将商品放入购物车 if (op.equals("add")){ //从商品库中取出所选购商品的数据 String bm = request.getParameter("bm"); String name=null,price=null; sql = "select * from shop where SP_NO=?"; pstat = conn.prepareStatement(sql); pstat.setString(1,bm); rs = pstat.executeQuery(); if (rs.next()){ name = rs.getString("SP_NAME").trim(); price = rs.getString("SP_PRICE").trim(); } rs.close(); pstat.close();
//将所选购商品加入到购物车中 sql = "insert into cart(SP_NAME,SP_PRICE,BUY_NUM,COUNT) values(?,?,?,?)"; pstat = conn.prepareStatement(sql); pstat.setString(1,name); pstat.setString(2,price); pstat.setInt(3,1); pstat.setString(4,price); pstat.executeUpdate(); pstat.close();
//关闭数据库连接 conn.close();
//重定向到购物车页面 response.sendRedirect("cart.jsp"); }
//更改商品的数量 if (op.equals("update")){ int id = Integer.parseInt(request.getParameter("id")); int num = Integer.parseInt(request.getParameter("num")); double price=Double.parseDouble(request.getParameter("price")); sql = "update cart set BUY_NUM = ?, COUNT = ? where ID=?"; pstat = conn.prepareStatement(sql); pstat.setInt(1,num); pstat.setString(2,new Double(price*num).toString()); pstat.setInt(3,id); pstat.executeUpdate(); pstat.close();
//关闭数据库连接 conn.close();
//重定向到购物车页面 response.sendRedirect("cart.jsp"); }
//将商品退回到商品架(将商品从购物车中删除) if (op.equals("del")){ int id = Integer.parseInt(request.getParameter("id")); sql = "delete from cart where ID=?"; pstat = conn.prepareStatement(sql); pstat.setInt(1,id); pstat.executeUpdate(); pstat.close();
//关闭数据库连接 conn.close();
//重定向到购物车页面 response.sendRedirect("cart.jsp"); }
//清空购物车 if (op.equals("clear")){ sql = "delete from cart"; pstat = conn.prepareStatement(sql); pstat.executeUpdate(); pstat.close();
//关闭数据库连接 conn.close();
//重定向到购物车页面 response.sendRedirect("cart.jsp"); } %> |
数据库eshop：
| /*!40101 SET CHARACTER SET 'gb2312' */;
DROP DATABASE IF EXISTS `eshop`; CREATE DATABASE `eshop` /*!40100 DEFAULT CHARACTER SET gb2312 */; USE `eshop`;
/*!40101 SET CHARACTER SET 'gb2312' */;
CREATE TABLE `cart` ( `ID` int(11) NOT NULL auto_increment, `SP_NAME` varchar(40) default NULL, `SP_PRICE` decimal(8,2) default NULL, `BUY_NUM` int(11) default NULL, `COUNT` decimal(9,2) default NULL, PRIMARY KEY (`ID`) ) ENGINE=InnoDB DEFAULT CHARSET=gb2312;
CREATE TABLE `shop` ( `SP_NO` char(10) NOT NULL, `SP_NAME` varchar(40) default NULL, `SP_PRICE` decimal(8,2) default NULL, `SP_INFO` varchar(200) default NULL, `SP_PIC` varchar(50) default NULL, PRIMARY KEY (`SP_NO`) ) ENGINE=InnoDB DEFAULT CHARSET=gb2312;
INSERT INTO `shop` (`SP_NO`,`SP_NAME`,`SP_PRICE`,`SP_INFO`,`SP_PIC`) VALUES ('SP0001','音频卡',950,'MAYA44 V3是具有24bit/96KHz专业指标的4进4出专业数字音频卡','pic/pic01.jpg'); INSERT INTO `shop` (`SP_NO`,`SP_NAME`,`SP_PRICE`,`SP_INFO`,`SP_PIC`) VALUES ('SP0002','合成器',4980,'PK-6以较低的价格为你提供E-MU最新的Proteus声音和高质量的键盘','pic/pic02.jpg'); INSERT INTO `shop` (`SP_NO`,`SP_NAME`,`SP_PRICE`,`SP_INFO`,`SP_PIC`) VALUES ('SP0003','MP3',450,'功能提示支持USB2.0高速传输','pic/pic03.jpg'); INSERT INTO `shop` (`SP_NO`,`SP_NAME`,`SP_PRICE`,`SP_INFO`,`SP_PIC`) VALUES ('SP0004','监听音箱',3800,'PX-T6A是强大的独立双功放、近场监听系统的理想选择','pic/pic04.jpg'); INSERT INTO `shop` (`SP_NO`,`SP_NAME`,`SP_PRICE`,`SP_INFO`,`SP_PIC`) VALUES ('SP0005','摄像机',29800,'3CCD/传感器总象素：112万像素','pic/pic05.jpg'); |