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题目描叙：
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="123456"; 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); }}有关截图：
管理员界面：
用户界面：