使用Java语言编写一个模拟网上超市购物结算功能的程序，要求程序运行后有一个图形用户界面，可供用户输入购买的各种商品相关信息，最后给出用户的购物清单及总价格。

需求分析：

1.管理员添加商品以及其价格

2.用户购买商品打印订单信息以及结算订单

代码：

/*

* 创建者：张俊强

* 时间：2016/5/15

* */

package SaleSys;

import java.awt.*;

import java.awt.event.*;

import java.util.Vector;

import javax.swing.*;

import java.sql.*;

class Goods{

public String[] name;

public Float[] price;

Goods(){

name =new String[100];

price=new Float[100];

}

}

public class SuperMarket extends JFrame{

public static void main(String[] args) throws SQLException{

MainWinow mainWin=new MainWinow("网上超市购物结算");

mainWin.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

mainWin.setBounds(300, 300, 500, 400);

mainWin.setVisible(true);

mainWin.setWin(mainWin);

mainWin.setMinWindowLayout();

}

}

class MainWinow extends JFrame{

Goods goods;

private JButton user;

private JButton manager;

private JLabel loginLabel;

private ManageWindow magWin;

private UserWindow userWin;

private Listener lis;

private MainWinow loginWin;

private int goodsNum;

/*

* 设置界面

* */

private JLabel setNameLabel;

private JLabel setPriceLabel;

private JTextField setNameText;

private JTextField setPriceText;

private JButton inputBut;

private TextArea inputArea;

private JButton returnBut1;

private JButton cancelBut;

/*

* 用户界面

* */

private Vector buyItem;

private Float[] buyCount;

private int buyNum;

private JComboBox goodsCombox;

private JButton returnBut2;

private JLabel choiceGoodLabel;

private JLabel showPriceLabel;

private JTextField showPrice;

private TextArea showChoice;

private JLabel showBuyNum;

private JTextField showBuyNumText;

private JButton submitBuy;

private JButton deleteBuyBut;

private JList choiceList;

private JButton countBut;

private Float sumMoney;

/**

* 数据库导入

*/

Statement stmt;

MainWinow(String winName) throws SQLException{

super(winName);

goodsNum=0;

buyNum=0;

sumMoney=(float)0;

goods=new Goods();

user=new JButton("我是用户");

manager=new JButton("我是管理员");

loginLabel=new JLabel("请选择角色!");

magWin=new ManageWindow("设置商品");

magWin.setBounds(300, 300, 500, 400);

magWin.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);

userWin=new UserWindow("欢迎选购");

userWin.setBounds(300, 300, 500, 400);

userWin.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);

lis=new Listener();

/*

* 设置界面初始化

* */

setNameLabel=new JLabel("商品名:");

setPriceLabel=new JLabel("价格:");

setNameText=new JTextField(5);

setPriceText=new JTextField(5);

inputBut=new JButton("确认添加");

inputArea=new TextArea();

returnBut1=new JButton("返回");

cancelBut=new JButton("撤回添加");

/*

* 用户界面初始化

* */

goodsCombox=new JComboBox();

returnBut2=new JButton("返回");

choiceGoodLabel=new JLabel("请选择商品:");

showPriceLabel=new JLabel("价格");

showPrice=new JTextField(5);

showChoice=new TextArea();

showBuyNum=new JLabel("购买数量:");

showBuyNumText=new JTextField(5);

submitBuy=new JButton("确认购买");

deleteBuyBut=new JButton("删除订单");

countBut=new JButton("订单结算");

choiceList=new JList();

buyItem=new Vector();

buyCount=new Float[100];

/*

* 数据库的导入

* */

try {

Class.forName("com.mysql.jdbc.Driver");

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

String url= "jdbc:mysql://localhost:3306/device";

String user="root";

String password="zjq1314520";

Connection con=DriverManager.getConnection(url,user,password);

stmt = con.createStatement();

/*

* 数据库数据的导出

* */

importSql();

}

public void importSql() throws SQLException {

int i=1;

// TODO Auto-generated method stub

ResultSet result=stmt.executeQuery(

"SELECT name,price FROM goods_info"

);

while(result.next()){

goods.name[i-1]=result.getString(1);

goods.price[i-1]=Float.parseFloat(result.getString(2));

i++;

}

goodsNum=i-1;

}

public void setWin(MainWinow w){

loginWin=w;

}

public void setMinWindowLayout(){

Container loginCon=new Container();

loginCon.setLayout(new FlowLayout());

loginCon.add(manager);

loginCon.add(user);

manager.addActionListener(lis);

user.addActionListener(lis);

this.setLayout(new BorderLayout());

this.add(loginLabel,BorderLayout.NORTH);

this.add(loginCon,BorderLayout.CENTER);

this.validate();

/*

* 设置界面布局

* */

magWin.setLayout(new FlowLayout());

magWin.add(setNameLabel);

magWin.add(setNameText);

magWin.add(setPriceLabel);

magWin.add(setPriceText);

magWin.add(inputBut);

magWin.add(inputArea);

magWin.add(cancelBut);

magWin.add(returnBut1);

inputBut.addActionListener(lis);

returnBut1.addActionListener(lis);

cancelBut.addActionListener(lis);

/*

* 用户界面布局

* */

userWin.setLayout(new BorderLayout());

Container userCon=new Container();

userCon.setLayout(new FlowLayout());

userCon.add(choiceGoodLabel);

userCon.add(goodsCombox);

userCon.add(showPriceLabel);

userCon.add(showPrice);

userCon.add(showBuyNum);

userCon.add(showBuyNumText);

userCon.add(submitBuy);

userWin.add(userCon,BorderLayout.NORTH);

//choiceList.setListData(goods.name);

userWin.add(choiceList,BorderLayout.CENTER);

userWin.add(new JScrollPane(choiceList));

Container butCon=new Container();

butCon.setLayout(new FlowLayout());

butCon.add(deleteBuyBut);

butCon.add(countBut);

butCon.add(returnBut2);

userWin.add(butCon,BorderLayout.SOUTH);

goodsCombox.addItemListener(

new ItemListener(){

@Override

public void itemStateChanged(ItemEvent e) {

// TODO Auto-generated method stub

int i=goodsCombox.getSelectedIndex();

if(i>=0)showPrice.setText(goods.price[i].toString());

}

}

);

returnBut2.addActionListener(lis);

submitBuy.addActionListener(lis);

deleteBuyBut.addActionListener(lis);

countBut.addActionListener(lis);

}

private void addComboxItem() {

// TODO Auto-generated method stub

for(int i=0;i

goodsCombox.addItem(goods.name[i]);

}

}

class Listener implements ActionListener{

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if(e.getSource()==manager){

addGoods();

loginWin.setVisible(false);

magWin.setVisible(true);

}

if(e.getSource()==user){

loginWin.setVisible(false);

userWin.setVisible(true);

goodsCombox.removeAllItems();

addComboxItem();

}

if(e.getSource()==inputBut){

//String showOut="";

if(setNameText.getText().equals("")||setPriceText.getText().equals("")){

JOptionPane.showMessageDialog(magWin,"不可以有空余项!", "警告",JOptionPane.PLAIN_MESSAGE);

}

else{

goods.name[goodsNum]=setNameText.getText();

goods.price[goodsNum]=Float.parseFloat(setPriceText.getText());

try {

/*

* 写进数据库

* */

stmt.executeUpdate("insert into goods_info(name,price)values('"+goods.name[goodsNum]+"','"+(float)goods.price[goodsNum]+"')");

} catch (SQLException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

goodsNum++;

addGoods();

setNameText.setText("");

setPriceText.setText("");

//showOut="商品名:"+setNameText.getText()+"\t"+"价格:"+setPriceText.getText()+"\n";

//inputArea.append(showOut);

}

}

if(e.getSource()==cancelBut){

if(goodsNum>0){

goodsNum--;

String deleteName=goods.name[goodsNum];

String deletePrice=goods.price[goodsNum].toString();

//System.out.println(deleteName);

/*

* 删除数据库里面的元素

* */

String sql = "delete from goods_info where name = '"+deleteName+"' AND price ='"+deletePrice+"'";

try {

stmt.executeUpdate(sql);

} catch (SQLException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

//Connection con= DBManager .getConnection();;

//PreparedStatement ps = con.prepareStatement(sql);

addGoods();

}

}

if(e.getSource()==returnBut1){

loginWin.setVisible(true);

magWin.setVisible(false);

}

/*

* 用户界面事件响应

* */

if(e.getSource()==returnBut2){

loginWin.setVisible(true);

userWin.setVisible(false);

}

if(e.getSource()==submitBuy){

if(!showBuyNumText.getText().equals("")){

buyCount[goodsCombox.getSelectedIndex()]=Float.parseFloat(showBuyNumText.getText());

String contentItem="";

Float sumMon=Float.parseFloat(showBuyNumText.getText())*(Float)goods.price[goodsCombox.getSelectedIndex()];

contentItem="商品名："+goods.name[goodsCombox.getSelectedIndex()]+" "

+"单价："+goods.price[goodsCombox.getSelectedIndex()].toString()+" "

+"购买数量："+showBuyNumText.getText()+" "

+"总价："+sumMon.toString();

buyItem.addElement(contentItem);

//buyItem[buyNum]=contentItem;

buyNum++;

choiceList.removeAll();

choiceList.setListData(buyItem);

sumMoney+=sumMon;

}

else{

JOptionPane.showMessageDialog(magWin,"购买数量不可以为空", "警告",JOptionPane.PLAIN_MESSAGE);

}

}

if(e.getSource()==deleteBuyBut){

if(choiceList.getSelectedValue()==null){

JOptionPane.showMessageDialog(magWin,"未选择待删除的物品", "警告",JOptionPane.PLAIN_MESSAGE);

}

else if(buyNum>0){

int i=choiceList.getSelectedIndex();

String selectItem=buyItem.get(i);

//System.out.println(selectItem);

String deletePrice="";

for(int j=0;j

// System.out.println(selectItem.substring(j, j+3));

if(selectItem.substring(j, j+3).equals("总价：")){

deletePrice=selectItem.substring(j+3,selectItem.length());

System.out.println(deletePrice);

sumMoney-=Float.parseFloat(deletePrice);

break;

}

}

buyItem.remove(i);

choiceList.removeAll();

choiceList.setListData(buyItem);

choiceList.validate();

buyNum--;

}

else{

JOptionPane.showMessageDialog(magWin,"购物车为空,不可删除", "警告",JOptionPane.PLAIN_MESSAGE);

}

}

if(e.getSource()==countBut){//sumMoney

for(int i=0;i

String str=buyItem.get(i).substring(0, 2);

if(str.equals("总价")){

buyItem.remove(i);

}

}

buyItem.addElement("总价："+sumMoney.toString());

choiceList.removeAll();

choiceList.setListData(buyItem);

choiceList.validate();

}

}

private void addGoods() {

if(!inputArea.getText().equals(""))inputArea.setText("");

// TODO Auto-generated method stub

for(int i=0;i

String massage="商品名:"+goods.name[i]+"\t"+"价格:"+goods.price[i].toString()+"\n";

inputArea.append(massage);

}

}

}

}

class ManageWindow extends JFrame {

ManageWindow(String title){

super(title);

}

}

class UserWindow extends JFrame{

UserWindow(String title){

super(title);

}

}

删除有关数据库部分便可以在自己电脑上运行！

有关截图：

管理员界面：

用户界面：

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