Java小项目之：图书馆管理系统！有借有还再借不难！

部分代码展示：

public class BookLoginIFrame extends JFrame {

private class BookResetAction implements ActionListener {
    public void actionPerformed(final ActionEvent e){
        username.setText("");
        password.setText("");

    }
}
class BookLoginAction implements ActionListener {
    public void actionPerformed(final ActionEvent e) {
        user = Dao.check(username.getText(), password.getText());
        if (user.getName() != null) {

            try {

                Library frame = new Library();
                frame.setVisible(true);
                BookLoginIFrame.this.setVisible(false);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else {
            JOptionPane.showMessageDialog(null, "只有管理员才可以登录！");
            username.setText("");
            password.setText("");
        }
    }
}
private JPasswordField password;
private JTextField username;
private JButton login;
private JButton reset;
private static Operater user;
/**
 * Launch the application
 * @param args
 */

/**
 * Create the frame
 */
public BookLoginIFrame() {
    super();
    final BorderLayout borderLayout = new BorderLayout();
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    borderLayout.setVgap(10);
    getContentPane().setLayout(borderLayout);
    setTitle("图书馆管理系统登录");
    setBounds(100, 100, 285, 194);

    final JPanel panel = new JPanel();
    panel.setLayout(new BorderLayout());
    panel.setBorder(new EmptyBorder(0, 0, 0, 0));
    getContentPane().add(panel);

    final JPanel panel_2 = new JPanel();
    final GridLayout gridLayout = new GridLayout(0, 2);
    gridLayout.setHgap(5);
    gridLayout.setVgap(20);
    panel_2.setLayout(gridLayout);
    panel.add(panel_2);

    final JLabel label = new JLabel();
    label.setHorizontalAlignment(SwingConstants.CENTER);
    label.setPreferredSize(new Dimension(0, 0));
    label.setMinimumSize(new Dimension(0, 0));
    panel_2.add(label);
    label.setText("用  户  名：");

    username = new JTextField(20);
    username.setPreferredSize(new Dimension(0, 0));
    panel_2.add(username);

    final JLabel label_1 = new JLabel();
    label_1.setHorizontalAlignment(SwingConstants.CENTER);
    panel_2.add(label_1);
    label_1.setText("密      码：");

    password = new JPasswordField(20);
    password.setDocument(new MyDocument(6));
    password.setEchoChar(‘*‘);//设置密码框的回显字符
    password.addKeyListener(new KeyAdapter() {
        public void keyPressed(final KeyEvent e) {
            if (e.getKeyCode() == 10)
                login.doClick();
        }
    });
    panel_2.add(password);

    final JPanel panel_1 = new JPanel();
    panel.add(panel_1, BorderLayout.SOUTH);

    login=new JButton();
    login.addActionListener(new BookLoginAction());

    login.setText("登录");
    panel_1.add(login);
    reset=new JButton();
    reset.addActionListener(new BookResetAction());

    reset.setText("重置");
    panel_1.add(reset);

    final JLabel tupianLabel = new JLabel();
    ImageIcon loginIcon=CreatecdIcon.add("login.jpg");
    tupianLabel.setIcon(loginIcon);
    tupianLabel.setOpaque(true);
    tupianLabel.setBackground(Color.GREEN);
    tupianLabel.setPreferredSize(new Dimension(260, 60));
    panel.add(tupianLabel, BorderLayout.NORTH);
    //
    setVisible(true);
    setResizable(false);
    //setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

}
public static Operater getUser() {
    return user;
}
public static void setUser(Operater user) {
    BookLoginIFrame.user = user;
}

}
需要这个图书馆管理系统素材和源码的小伙伴可以私信我领取，当然我不止有这点资料！

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Java小项目之：图书馆管理系统！有借有还再借不难！

原文：https://blog.51cto.com/14623707/2466739