lasttest.java

一个学员信息管理系统小程序

            throw new TextException();
        if ((psd_t.getText().length() < 4) || (psd_t.getText().length() > 10))
            throw new PsdException();
    }
}

class MainFrame extends JFrame           //主窗口
{
    public MainFrame(String b,WelcomeFrame a)
    {
        setTitle("欢迎使用学生信息管理系统");
        setBounds(150,150,400,300);
        setResizable(false);
        
        MainPanel mpanel = new MainPanel(b,a,this);
        getContentPane().add(mpanel);
        new File("D:\\INFO\\").mkdirs();
    }
}

class MainPanel extends JPanel
{
    private final  JLabel num,phone,name,school,address;
    private final  JTextField num_t,phone_t,name_t,school_t,address_t;
    private final JButton save,show,logout,quit;
    private final JScrollPane sp;
    private final JTextArea message;
    private final StringBuffer buffer;
    private final File file;
    private FileWriter writer;
    private FileReader reader;
    private boolean appear = false;
    private String mess;
    
    public MainPanel(String b,final WelcomeFrame a,final MainFrame c)
    {
        file = new File("D:\\INFO\\" + b + ".dat");
        
        setLayout(new FlowLayout());
        
        num = new JLabel("学号：");
        phone = new JLabel("电话：");
        name = new JLabel("姓名：");
        school= new JLabel("学校：");
        address = new JLabel("地址：");
        num_t = new JTextField(b,12);
        num_t.setEnabled(false);
        phone_t = new JTextField(12);
        name_t = new JTextField(12);
        school_t = new JTextField(12);
        address_t = new JTextField(29);
        
        if (!file.exists())
        {
            save = new JButton("保存(S)");
            save.setMnemonic('S');
            save.setToolTipText("保存信息");
        }
        else
        {
            save = new JButton("修改(M)");
            save.setMnemonic('M');
            save.setToolTipText("修改信息");
        }
        
        show = new JButton("显示(D)");
        show.setMnemonic('D');
        show.setToolTipText("显示信息");
        logout = new JButton("注销(L)");
        logout.setMnemonic('L');
        logout.setToolTipText("注销登陆");
        
        quit = new JButton("退出(Q)");
        quit.setMnemonic('Q');
        quit.setToolTipText("退出系统");
        
        message = new JTextArea(8,33);
        message.setLineWrap(true);
        message.setWrapStyleWord(true);
        message.setEditable(false);
        sp = new JScrollPane(message);
        
        buffer = new StringBuffer();
        
        add(num);
        add(num_t);
        add(phone);
        add(phone_t);
        add(name);
        add(name_t);
        add(school);
        add(school_t);
        add(address);
        add(address_t);
        add(save);
        add(show);
        add(logout);
        add(quit);
        add(sp);
        
        c.addWindowListener(new WindowAdapter()
        {
            public void windowOpened(WindowEvent e)
            {
                c.setBounds(150,150,400,200);
                sp.setVisible(false);
            }
        });
        
        phone_t.addKeyListener(new KeyAdapter()     //控制输入的字符
        {
            public void keyTyped(KeyEvent e)
            {
                char ch = e.getKeyChar();
                if (ch < '0' || ch > '9')
                {
                    if (ch != '\b')
                    {
                        e.consume();
                    }
                }
            }
        });
        
        save.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                try
                {
                    FileWriter writer = new FileWriter(file);
                    mess = num.getText().trim() + num_t.getText().trim() + "\n"
                    + phone.getText().trim() + phone_t.getText().trim() + "\n"
                    + name.getText().trim() + name_t.getText().trim() + "\n"
                    + school.getText().trim() + school_t.getText().trim() + "\n"
                    + address.getText().trim() + address_t.getText().trim() + "\n\n";
                    writer.write(mess);
                    writer.close();
                    if (appear)
                    {
                        buffer.delete(0,buffer.length());
                        appear = false;
                        show.doClick();
                    }
                }
                catch (IOException e1)
                {
                    try
                    {
                        if (!file.exists())
                            file.createNewFile();
                    }
                    catch (IOException e2)
                    {}
                }
                finally
                {
                    save.setText("修改(M)");
                    save.setMnemonic('M');
                    save.setToolTipText("修改信息");
                }
            }
        });
        
        show.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                if (!appear)
                {
                    try
                    {
                        FileReader reader = new FileReader(file);
                        int k;
                        while ((k = reader.read()) != -1)
                        {
                            buffer.append((char)k);
                        }
                        message.setText(buffer.toString());
                        reader.close();
                        show.setText("隐藏(H)");
                        show.setMnemonic('H');
                        show.setToolTipText("隐藏信息");
                        c.setBounds(150,150,400,300);
                        sp.setVisible(true);
                        appear = true;
                    }
                    catch (IOException e1)
                    {
                        JOptionPane.showMessageDialog(null,"没有这个数据存在！","警告",2);
                    }
                }
                else
                {
                    buffer.delete(0,buffer.length());
                    message.setText("");
                    show.setText("显示(D)");
                    show.setMnemonic('D');
                    show.setToolTipText("显示信息");
                    sp.setVisible(false);
                    c.setBounds(150,150,400,200);
                    appear = false;
                }
            }
        });
        
        logout.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)       //注销时两个窗口的切换
            {
                int l = JOptionPane.showConfirmDialog(null,"你确定要注销吗？","信息",0,3);
                if (l == 0)
                {
                    a.setVisible(true);
                    c.setVisible(false);
                    phone_t.setText("");
                    name_t.setText("");
                    school_t.setText("");
                    address_t.setText("");
                    appear = false;
                }
            }
        });
        
        quit.addActionListener(new ActionListener()         //退出系统按钮，跟窗体事件一样
        {
            public void actionPerformed(ActionEvent e)
            {
                int l = JOptionPane.showConfirmDialog(null,"你确定要退出系统吗？","选择操作",2,3);
                if (l == 0)
                    System.exit(0);
            }
        });
    }
}

class TextException extends Exception        //学号格式异常
{
    public void display()
    {
        JOptionPane.showMessageDialog(null,"学号应该输入四位数字！请重新输入！","错误",0);
    }
}

class PsdException extends Exception             //密码长度异常
{
    public void display()
    {
        JOptionPane.showMessageDialog(null,"密码应该在4-10之间，请重新输入！","错误",0);
    }
}