Java编写网上超市购物结算功能程序

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：
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									/* 

									 * 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<String> 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<String>(); 

									  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<goodsNum;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<selectItem.length()-3;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<buyItem.size();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<goodsNum;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); 

									 } 

									}