实验五 实现购物车功能（jsp+javabean+jdbc+mysql数据库）
想上传视频来着，觉得太麻烦，我就直接截图吧。购物车的基本功能都实现了，比如在商品显示在页面上，对了，我的图像，是放路径的，放图片的同学可以把自己的图片换上，加入购物车的时候，判断该商品是否在购物车内，是的话直接加1 ，不是直接插入，用到了虚拟账户，多少钱自己充，购买之后更新订单表，购物车表清空,商品表的库存也相应减少。其他的有些功能没有实现，可能里面还有写无关要的代码，那些可以删，当初想搞全面一点但是精力有限。
shop.product 商品表
shop.shopcart购物车表
订单表shop.order
DataBaseConnection.java(连接数据库)
package test5;
import java.sql.*;
public class DataBaseConnection {
private static String driverStr="com.mysql.jdbc.Driver";//驱动列表
private static String connStr="jdbc:mysql://localhost/mySql";//mySql是我自己的数据库名
private static String dbusername="root";//数据库用户名
private static String dbpassword="12345678";//密码和数据库一致
private static Connection conn=null;//数据库的连接对象
private Statement stmt=null;//创建Statement对象
public DataBaseConnection() { }
//一个静态方法，返回一个数据库的连接，这样达到了对数据库连接统一控制的目的
public static Connection getConnection() throws SQLException {
try{
Class.forName(driverStr);//加载驱动程序
conn = DriverManager.getConnection(connStr,dbusername, dbpassword);//连接数据库
}
catch(Exception ex){System.out.println("无法同数据库建立连接！");}
return conn;
}
public int executeUpdate(String s)
{
int result=0;
try{
stmt = conn.createStatement();//创建Statement语句
result=stmt.executeUpdate(s);//执行更新语句
}
catch(Exception ex){System.out.println("执行更新错误！");}
return result;
}
public ResultSet executeQuery(String s)
{
ResultSet rs=null;
try{rs=stmt.executeQuery(s);}//执行查询语句
catch(Exception ex){System.out.println("执行查询错误！");}
return rs;
}
public void close()//关闭与数据库的连接
{
try{
stmt.close();
conn.close();
}
catch(Exception e){}
}
public static void main(String[] args) {
try {
Connection conn=DataBaseConnection.getConnection();
if(conn!=null)
{
System.out.println("连接数据库正常");
}
else {
System.out.println("连接数据库异常");
}
} catch (Exception ex) {
// TODO: handle exception
ex.printStackTrace();
}
}
}
product.java (商品类）
package test5;
//商品类
public class product {
private int id;//商品编号
private String name;//商品名称
private String msg;//商品信息
private int price;//商品价格
private String type;//商品类型
private int quantity;//商品库存
private String picture;//商品图片
private int num;//购买同一件商品的数量
private int totalprice;//购买同款商品的总价格
public int getTotalprice() {
return totalprice;
}
public void setTotalprice(int totalprice) {
this.totalprice = totalprice;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public String getPicture() {
return picture;
}
public void setPicture(String picture) {
this.picture = picture;
}
}
Product_clo.java(获取商品表中的全部信息和购物车表中商品id）
package test5;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
public class Product_clo {
ArrayList list = new ArrayList();
// 获得所有商品的全部信息
public ArrayList getAllProduct() {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
ArrayList list = new ArrayList();// 把商品信息放列表里
try {
conn = DataBaseConnection.getConnection();
String sql = "select * from shop.product;";
stmt = conn.prepareStatement(sql);
rs = stmt.executeQuery();
while (rs.next()) {
product product = new product();
product.setId(rs.getInt("product_id"));
product.setName(rs.getString("product_name"));
product.setMsg(rs.getString("product_msg"));
product.setPrice(rs.getInt("product_price"));
product.setType(rs.getString("product_type"));
product.setQuantity(rs.getInt("product_quantity"));
product.setPicture(rs.getString("product_picture"));
list.add(product);// 把一个商品的所有信息加入列表
}
return list;
} catch (Exception ex) {
ex.printStackTrace();
return null;
} finally {
// 释放数据集对象
if (rs != null) {
try {
rs.close();
rs = null;
} catch (Exception ex) {
// TODO: handle exception
ex.printStackTrace();
}
}
// 释放语句对象
if (stmt != null) {
try {
stmt.close();
stmt = null;
} catch (Exception ex) {
// TODO: handle exception
ex.printStackTrace();
}
}
}
}
// 获取购物车商品的id
public ArrayList getCartId() {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
conn = DataBaseConnection.getConnection();
String sql = "select product_id from shop.shopcart;";// SQL语句
stmt = conn.prepareStatement(sql);
rs = stmt.executeQuery();
while (rs.next()) {
list.add(rs.getInt(1));// 把一个商品的所有信息加入列表
}
return list;
} catch (Exception ex) {
ex.printStackTrace();
return null;
} finally {
// 释放数据集对象
if (rs != null) {
try {
rs.close();
rs = null;
} catch (Exception ex) {
// TODO: handle exception
ex.printStackTrace();
}
}
// 释放语句对象
if (stmt != null) {
try {
stmt.close();
stmt = null;
} catch (Exception ex) {
// TODO: handle exception
ex.printStackTrace();
}
}
}
}
private PreparedStatement setInt(int i, int j) {
// TODO Auto-generated method stub
return null;
}
private PreparedStatement setString(int i, String name) {
// TODO Auto-generated method stub
return null;
}
} frame.jsp(框架布局）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
在线购物
<%
String username = request.getParameter("username");
String pwd = request.getParameter("pwd");
session.setAttribute("username", username);
session.setAttribute("pwd", pwd);
%>
shop.jsp(商品页面表）
<%@page import="test5.product"%>
<%@page import="test5.Product_clo"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="java.sql.*"%>
<%@page import="java.util.*"%>
在线购物
shopcart.jsp（处理查改增删）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="java.util.*" import="java.sql.*"%>
<%@page import="test5.product"%>
<%@page import="test5.Product_clo"%>
我的购物车
list = new ArrayList();
try {
//将所选商品加入购物车表中
if (op.equals("add")) {
list = clo.getCartId();//链表存的是购物车商品的id
int pid = 0;
int num = 0;
int totalprice = 0;
pid = Integer.parseInt(proid);//从购物页面传过来的id，强转int后面好比较
int cartid = 0;
int price = 0;
if (list.contains(pid)) {//如果链表里有，那说明该商品已经存在于购物车，在数量上加1即可
//得先从购物车把该商品id的相关的数量和价格查询出来
sql = "select product_price,cart_product_quantity from shop.shopcart where product_id="+pid;
stmt = conn.prepareStatement(sql);
rs = stmt.executeQuery(sql);
while(rs.next()){
price = rs.getInt(1);
num = rs.getInt(2);
}
num = num + 1;//再此基础上加1
totalprice = price * num;//更新该商品的总价
sql = "update shop.shopcart set cart_product_quantity = ?, totalprice = ? where product_id=?;";
stmt = conn.prepareStatement(sql);
stmt.setInt(1, num);
stmt.setInt(2, totalprice);
stmt.setInt(3, pid);
stmt.executeUpdate();
out.print("pid = cartid");
response.sendRedirect("buy.jsp");//重定向到购物车
stmt.close();
conn.close();
} else {//没有购物车匹配不到该商品则直接插入
sql = "insert into shop.shopcart(product_id,product_name,product_price,cart_product_quantity,totalprice) values(?,?,?,?,?);";
stmt = conn.prepareStatement(sql);
stmt.setString(1, proid);
stmt.setString(2, proname);
stmt.setString(3, proprice);
stmt.setInt(4, 1);
stmt.setString(5, proprice);
stmt.executeUpdate();
stmt.close();
conn.close();
response.sendRedirect("buy.jsp");
}
}
//在购物车中删除商品
if (op.equals("del")) {
int id = Integer.parseInt(request.getParameter("id"));
sql = "delete from shop.shopcart where product_id=?;";
stmt = conn.prepareStatement(sql);
stmt.setInt(1, id);
stmt.executeUpdate();
stmt.close();
conn.close();
response.sendRedirect("buy.jsp");
}
//更改商品的数量
if (op.equals("update")) {
int totalprice = 0;
int total = 0;
int id = Integer.parseInt(request.getParameter("id"));
int num = Integer.parseInt(request.getParameter("num"));
int price = Integer.parseInt(request.getParameter("price"));
totalprice = price * num;
sql = "update shop.shopcart set cart_product_quantity = ?, totalprice = ? where product_id=?;";
stmt = conn.prepareStatement(sql);
stmt.setInt(1, num);
stmt.setInt(2, totalprice);
stmt.setInt(3, id);
stmt.executeUpdate();
stmt.close();
conn.close();
response.sendRedirect("buy.jsp");
}
//清空购物车
if (op.equals("clear")) {
sql = "delete from shop.shopcart;";
stmt = conn.prepareStatement(sql);
stmt.executeUpdate();
stmt.close();
//关闭数据库连接
conn.close();
//重定向到购物车页面
response.sendRedirect("buy.jsp");
}
} catch (
Exception ex) {
ex.printStackTrace();
}
%>
buy.jsp(购物车页面）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="java.util.*" import="java.sql.*"%>
<%@page import="test5.product"%>
<%@page import="test5.Product_clo"%>
我的购物车
我的购物车
继续购物
清空购物车
pay.jsp（支付界面）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
支付界面
<%
Integer a = (Integer) session.getAttribute("a");//账户余额
Integer total = (Integer) session.getAttribute("total");//支付金额
if (session.getAttribute("a") == null) {
a = 0;
}
if (a >= total) {
a = a - total;
session.setAttribute("a", a);
%>
支付成功！正在生成订单...
<%
response.setHeader("Refresh", "3;url=order.jsp"); //3秒跳转到支付订单
} else {
%>
<%
}
%>
money.jsp(充钱）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" import="java.util.*" import="java.lang.*"%>
账户充值
order.jsp（订单界面）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="test5.product" import="java.util.*" import="java.sql.*"%>
<%@page import="test5.Product_clo" import="java.util.Date"%>
<%@page import="java.text.SimpleDateFormat"%>
我的订单
<%=d%>您的订单如下：
商品名称
商品单价
购买数量
商品价格
<%
//取商品信息值
String name = null;
ResultSet rs = null;
Connection conn = null;
PreparedStatement stmt = null;
conn = db.getConnection();
//String sql="insert into shop.order select * from shop.shopcart;";
String sql = "insert into shop.order(product_id,product_name,product_price,product_num,product_total) select product_id,product_name,product_price,cart_product_quantity,totalprice from shop.shopcart;";
stmt = conn.prepareStatement(sql);
stmt.executeUpdate();
//String name = null;
sql = "select * from shop.order;";
stmt = conn.prepareStatement(sql);
rs = stmt.executeQuery();
int price = 0;
int num = 0;
int totalprice = 0;
int id = 0;int pronum=0;
%>
<%
while (rs.next()) {
//显示在购物车里到商品信息
id=rs.getInt("product_id");
name = rs.getString("product_name");
price = rs.getInt("product_price");
num = rs.getInt("product_num");
totalprice = rs.getInt("product_total");
//商品表的库存也要更新
sql = "select product_quantity from shop.product where product_id="+id;
stmt = conn.prepareStatement(sql);
rs=stmt.executeQuery(sql);
while(rs.next()){
pronum=rs.getInt(1);
}
sql = "update shop.product set product_quantity = ? where product_id=?;";
stmt = conn.prepareStatement(sql);
stmt.setInt(1, pronum-num);
stmt.setInt(2, id);
stmt.executeUpdate();
%>
<%=name%>
<%=price%>
<%=num%>
<%=totalprice%>
<%
}
%>
总价：<%=session.getAttribute("total")%>元
<%
//加入订单表我的购物车表自然要清空了
sql = "delete from shop.shopcart";
stmt = conn.prepareStatement(sql);
stmt.executeUpdate();
stmt.close();
//关闭数据库连接
conn.close();
%>
left.jsp（左侧页面）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
导航栏
主题市场
top.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
尊敬的用户 <%-- <%= session.getAttribute("username")%> --%>欢迎您！
在线购物