超市收银系统(Java语言实现)

rightPanel=new JPanel(); showTime=new JTextField(12); rightPanelSon=new JPanel(); showTime.setEditable(false); rightPanel.setLayout(new BorderLayout(1,1)); rightPanel.add(showTime,BorderLayout.NORTH); rightPanel.add(BorderLayout.CENTER,rightPanelSon); this.add(leftPanel); this.add(rightPanel); this.setSize(600,500); this.setLocation(500,127); this.setVisible(true); } /** * * @return 返回文件中的记录 */ @SuppressWarnings({ "unchecked", "static-access" }) public static HashMap<ClubCard,Customer> getHashMap(){ File file=Checkstand.file; if(file.length()==0) { checkstand=new Checkstand(); checkstand.definedForSystemWindow(); } else try { ObjectInputStream in=new ObjectInputStream(new FileInputStream(file)); checkstand.cardAndCustomer=(HashMap<ClubCard,Customer>)in.readObject(); in.close(); } catch(IOException e){System.err.println(e.getMessage());} catch(ClassNotFoundException e1){System.err.println("文件未找到！");}
return checkstand.cardAndCustomer; } /** * 保存柜台信息 对象串行化 */ public static void AddCheckstandInfo() { try { if(c==null) c=new Checkstand(); ObjectOutputStream out=new ObjectOutputStream(new FileOutputStream(file)); out.writeObject(c); out.close(); } catch(IOException e){System.out.println(e.getMessage());} } /** * 从文件中读取柜台信息 对象串行化 * @throws ClassNotFoundException */ public static void readCheckstandInfo() { try { ObjectInputStream in=new ObjectInputStream(new FileInputStream(file));null) c=(Checkstand)o; else c=new Checkstand();//在此处生成柜台对象再合适不过来 in.close(); } catch(IOException e){System.out.println(e.getMessage());} catch(ClassNotFoundException e1){System.out.println("文件未找到!");} } public static void main(String[] args) { new SystemWindow(); } @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub
JPanel rightPanel; JTextField showTime; JPanel rightPanelSon; public SystemWindow() { super("欢迎使用超市收银系统"); file=new File("checkstand.dat"); SystemWindow.readCheckstandInfo();//读取柜台信息 Goods.getSurplusFromFile();//这一步很重要！ good=new Goods(); time=new Timer(1000,this);//时间 time.start(); this.setLayout(new GridLayout(1,2,4,4)); leftPanel=new JPanel(); leftPanel.setLayout(new GridLayout(6,1,4,4)); member=new JButton("会员服务"); common=new JButton("普通服务"); findMemberInfo=new JButton("查找会员信息"); findAllMemberInfo=new JButton("查看所有会员信息"); findGoodsSurplus=new JButton("查看商品剩余量"); findSaleroom=new JButton("查看柜台销售额"); member.addActionListener(this); common.addActionListener(this); findMemberInfo.addActionListener(this); findAllMemberInfo.addActionListener(this); findGoodsSurplus.addActionListener(this);
package cashier; import java.awt.BorderLayout; import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.Timer; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; @SuppressWarnings("serial") public class SystemWindow extends JFrame implements ActionListener{ static Checkstand checkstand;//此变量单纯为了保存读至保存 HashMap 文件中的数据， 相 当于一个中间媒介 /** * 供显示的商品信息 */ Goods good; /** * 保存收银台信息的文件 */ static File file; static Checkstand c;//放在此处并不和前面的 checkstand 相矛盾,此变量是为了读取、保存 柜台信息 static Long number;//输入的卡号
if(e.getSource()==member) { rightPanelSon.removeAll();//事先先移除 rightPanelSon 中的所有的组件 this.paintAll(getGraphics());//相当于重画的功能，此部骤相当重要 rightPanelSon.setLayout(new FlowLayout()); rightPanelSon.add(new JPanel()); rightPanelSon.add(new JPanel()); final JTextArea goodsInfo=new JTextArea();//显示商品信息 rightPanelSon.add(goodsInfo); goodsInfo.setEditable(false);//不可编辑 goodsInfo.setText(good.toString()); String id=JOptionPane.showInputDialog("请输入会员卡卡号:"); try { number=Long.parseLong(id); } catch(NumberFormatException e1){ JOptionPane.showMessageDialog(null, "输入格式有误！"); return; } final HashMap<ClubCard,Customer> c1=SystemWindow.getHashMap(); if(c1==null) { JOptionPane.showMessageDialog(null, " 会 员 信 息 不 存 在 !",null, JOptionPane.WARNING_MESSAGE); return;} else { int flag=0; Customer customer1=null; ClubCard card2 = null; for(ClubCard card:c1.keySet()) { if(number.equals(card.getId())) { JTextArea area=new JTextArea(); rightPanelSon.add(area); area.setText(c1.get(card).toString());//输出顾客信息 customer1=c1.get(card);