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購物車的源程序

1、重新計費部分還沒有做好，大家自己動手吧！
2、下一版本將用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;
//商品類型
if (request.getParameter("product_type")==null){
product_type="all";
}else{
product_type=request.getParameter("product_type");
}

//頁數和商品類型參數，可以在“繼續購物”時返回到上次購物的頁面
if (request.getParameter("curpage")==null){
curpage=1;
}else{
curpage=java.lang.Integer.parseInt(request.getParameter("curpage"));
}

//動作
if (request.getParameter("action")==null){
action="view";
}else{
action=request.getParameter("action");
}

//商品編號
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);

//商店編號
session.putValue("shop_id",num);
//顧客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%>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>購物車/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%>">繼續購物/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()">重新計費/a>/td>
/tr>
/table>
/center>/div>/td>
td width="122" height="7" style="border: medium" align="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=clearproduct_type=%=product_type%>
curpage=%=curpage%>">清空購物車/a>/td>
/tr>
/table>
/center>/div>/td>
td width="122" height="7" style="border: medium" align="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">確認購買/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">商品名稱/td>
td width="10%" height="8" align="left">市場價/td>
td width="10%" height="8" align="left">優惠價/td>
td width="10%" height="8" align="left">數量/td>
td width="14%" height="8" align="left">小計/td>
td width="12%" height="8" align="left">定金比例/td>
td width="17%" height="8" align="left">定金小計/td>
td width="17%" height="8" align="left">刪除/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=deleteproduct_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>總計/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>定金總計/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>結余/td>
td width="36%" colspan="2" height="16">
div align="left">%=total-total_first%>
/td>
/tr>
/table>
/center>/div>
%
}else{
%>
p align="center">購物車為空!/p>
%
}
%>

數據庫操作部分

程序用到兩個表：
1 shop_cart表
cart_id int 購物車編號自動編號
cart_shop_id nvarchar 商店編號
cart_product_id nvarchar 商品編號
cart_quantity int 商品數量
臨時存放購物車數據

2 shop_product表
product_id int 商品編號自動編號
shop_id nvarchar 商店編號
product_name nvarchar 商品名稱
product_bb nvarchar 商品介紹
product_price int 市場價
product_discount int 優惠價
product_img img 圖片
product_status nvarchar 狀態
product_first int 定金比例
product_type nvanchar 商品類型
存放商品資料

使用bka.java制成的javabean：bka.class可以提供對數據庫的操作。
另外，需在控制面板的系統DSN中注冊bka.dsn，
從而可使JSP通過JDBC-ODBC來調用sql數據庫。
在頁面中調用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!");
}
%>
注意應在使用后將rs關閉。
以下是bka.java的源程序。注意在使用前需用javac加以編譯成為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;
}
} 1、重新計費部分還沒有做好，大家自己動手吧！
2、下一版本將用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;
//商品類型
if (request.getParameter("product_type")==null){
product_type="all";
}else{
product_type=request.getParameter("product_type");
}

//頁數和商品類型參數，可以在“繼續購物”時返回到上次購物的頁面
if (request.getParameter("curpage")==null){
curpage=1;
}else{
curpage=java.lang.Integer.parseInt(request.getParameter("curpage"));
}

//動作
if (request.getParameter("action")==null){
action="view";
}else{
action=request.getParameter("action");
}

//商品編號
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);

//商店編號
session.putValue("shop_id",num);
//顧客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%>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>購物車/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%>">繼續購物/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()">重新計費/a>/td>
/tr>
/table>
/center>/div>/td>
td width="122" height="7" style="border: medium" align="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=clearproduct_type=%=product_type%>
curpage=%=curpage%>">清空購物車/a>/td>
/tr>
/table>
/center>/div>/td>
td width="122" height="7" style="border: medium" align="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">確認購買/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">商品名稱/td>
td width="10%" height="8" align="left">市場價/td>
td width="10%" height="8" align="left">優惠價/td>
td width="10%" height="8" align="left">數量/td>
td width="14%" height="8" align="left">小計/td>
td width="12%" height="8" align="left">定金比例/td>
td width="17%" height="8" align="left">定金小計/td>
td width="17%" height="8" align="left">刪除/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=deleteproduct_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>總計/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>定金總計/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>結余/td>
td width="36%" colspan="2" height="16">
div align="left">%=total-total_first%>
/td>
/tr>
/table>
/center>/div>
%
}else{
%>
p align="center">購物車為空!/p>
%
}
%>

數據庫操作部分

程序用到兩個表：
1 shop_cart表
cart_id int 購物車編號自動編號
cart_shop_id nvarchar 商店編號
cart_product_id nvarchar 商品編號
cart_quantity int 商品數量
臨時存放購物車數據

2 shop_product表
product_id int 商品編號自動編號
shop_id nvarchar 商店編號
product_name nvarchar 商品名稱
product_bb nvarchar 商品介紹
product_price int 市場價
product_discount int 優惠價
product_img img 圖片
product_status nvarchar 狀態
product_first int 定金比例
product_type nvanchar 商品類型
存放商品資料

使用bka.java制成的javabean：bka.class可以提供對數據庫的操作。
另外，需在控制面板的系統DSN中注冊bka.dsn，
從而可使JSP通過JDBC-ODBC來調用sql數據庫。
在頁面中調用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!");
}
%>
注意應在使用后將rs關閉。
以下是bka.java的源程序。注意在使用前需用javac加以編譯成為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;
}
}

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購物車的源程序