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JSP与JDBC购物车例子_陆丰凯_新浪博客

1.index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ page import="java.sql.*"%>

<html>
<head>
   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <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=&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>

2.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
String url ="jdbc:mysql://localhost:3306/eshop?user=root&password=&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>

3.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=&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");
}
%>

4.sql文件

;

DROP DATABASE IF EXISTS `eshop`;
CREATE DATABASE `eshop` ;
USE `eshop`;

;

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{zx1}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');

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