jsp实现购物程序_JSP教程-查字典教程网

摘要：下面是我用JSP和数据库做的购物车的源程序：注意：1、重新计费部分还没有做好，大家自己动手吧！2、下一版本将用session做。//shop...

下面是我用JSP和数据库做的购物车的源程序：

注意：

1、重新计费部分还没有做好，大家自己动手吧！

2、下一版本将用session做。

//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);

}

<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%>">继续购物</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>

<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>

</tr>

</table>

</center></div></td>

</tr>

<table border="1" cellpadding="2" cellspacing="0" width="100%" bgcolor="#FDFEE2"

bordercolorlight="#FFB468" bordercolordark="#FFFFFF" height="40">

<tr>

</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"><input type="text" name="<%= "t" + product_id %>" size="3" value="<%=cart_quantity%>"></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>

</tr>

</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;

}