Java JInternalFrame

Question

我正在制作一个程序，我不知道如何使它工作:我有一个mainFrame：

package itneizapenoitseg;

public class mainFrame extends JFrame {

    private dbconnection database = new dbconnection(); // DB connetion data (login , passw ..)
    private JDesktopPane desktop = new JDesktopPane(); // Need this to make Frame inside Frame

    public mainFrame() {
        super("");
        setLayout(null);
        setSize(850, 700);
        setLocation(500, 280);
        Login login = new Login(database);// I want to perform a login
        desktop.add(login);
        try {
            login.setSelected(true);
        }
        catch (Exception e) {
            // TODO: handle exception
        }
        setContentPane(desktop);
        /////////////////////////////////////////

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);

    }

    public static void main(String [] args) {
        new mainFrame();
    }
}

登录类：

package itneizapenoitseg;

import... //

public class Login extends JInternalFrame {

    // User and password fields
    JTextField usernameForm = new JTextField(15);
    JPasswordField passwordForm = new JPasswordField(15);
    JButton login = new JButton("Login");

    public Login(dbconnection database) {

        super("Login", true, true, true, true);

        setSize(300, 200);

        // The login panel
        JPanel panel = new JPanel();
        panel.setLayout(null);
        JLabel username = new JLabel("username :");
        JLabel password = new JLabel("password :");

        // Position
        username.setBounds(70, 10, 80, 11);
        password.setBounds(70, 55, 80, 17);
        usernameForm.setBounds(70, 30, 150, 20);
        passwordForm.setBounds(70, 75, 150, 20);
        login.setBounds(105, 100, 80, 20);

        // Addings elements to display panel
        panel.add(usernameForm);
        panel.add(passwordForm);
        panel.add(login);
        panel.add(password);
        panel.add(username);
        getContentPane().add(panel);

        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);// Doens't work
        setVisible(true);
        actionLogin(database);
    }

    // When pressing Login button...

    private void actionLogin(dbconnection database) {
        login.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                //TODO Have to change to MySql query
                String usname = usernameForm.getText();
                String passw = new String(passwordForm.getPassword());

                // Checking credencial
                if(usname.equals("test") && passw.equals("1234")){
                    // Here i want to call a mainFrame funcion (createGUI)
                    dispose();Destroy this panel
                } else{
                    JOptionPane.showMessageDialog(null, "Username or password wrong!");
                    usernameForm.setText("");
                    passwordForm.setText("");
                    usernameForm.requestFocus();
                }
            }
        });

    }
}  

我希望当有人成功登录时，会调用大型机的函数createGui或通知mainFrame的方法。我的意图是使mainFrame成为空，直到某些人成功登录和下一次显示它的内容。

Answer 1

非常类似于this SO question。

你可以叫((mainFrame) SwingUtilities.getWindowAncestor((Component)(e.getSource()))).createGUI();

希望这能有所帮助。

编辑:我刚刚测试的一个例子：

private void setHandlers() {
    jButton2.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            ((mainFrame) SwingUtilities.getWindowAncestor((Component)(e.getSource()))).showAlert();
        }
    });
}
public void showAlert() {
    JOptionPane.showConfirmDialog(this, "Confirming !!");
}

还有另一种选择(使用频率较低--至少我是这样)：

((mainFrame) SwingUtilities.getAncestorOfClass(mainFrame.class, ((Component)(e.getSource())))).createGUI();

重新编辑:您也可以尝试：

((mainFrame) ((JComponent) (e.getSource())).getTopLevelAncestor()).createGUI();