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：

/*
 * 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);
 }
} 

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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