DBLogin.java

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package db.kursus;
import java.sql.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

/**
 *
 * @author Aditya Pramana
 */
public class DBLogin {
    private String url;
    private String username;
    private String password;

    private JFrame frame;
    private JPanel panel;
    private JLabel lblUsername;
    private JLabel lblPassword;
    private JTextField txtUsername;
    private JPasswordField txtPassword;
    private JButton btnLogin;
    private JButton btnCancel;
    private JButton btnClear;
    private JButton btnGuest;

    public DBLogin(){
        this.url = "jdbc:mysql://localhost:3306/kursus";
        initializeComponent();
    }

    void initializeComponent(){
        frame = new JFrame("Login as Admin");
        panel = new JPanel();
        lblUsername = new JLabel("Username");
        lblPassword = new JLabel("Password");
        txtUsername = new JTextField(28);
        txtPassword = new JPasswordField(28);
        btnGuest = new JButton("Guest Mode");
        btnLogin = new JButton("Login");
        btnCancel = new JButton("Cancel");
        btnClear = new JButton("Clear");

        txtPassword.setEchoChar('●');
        btnGuest.addActionListener(new btnGuestListener());
        btnLogin.addActionListener(new btnLoginListener());
        btnCancel.addActionListener(new btnCancelListener());
        btnClear.addActionListener(new btnClearListener());
        panel.add(lblUsername);
        panel.add(txtUsername);
        panel.add(lblPassword);
        panel.add(txtPassword);
        panel.add(btnGuest);
        panel.add(btnLogin);
        panel.add(btnCancel);
        panel.add(btnClear);

        frame.setResizable(false);
        frame.getContentPane().add(BorderLayout.CENTER, panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 150);
        frame.setVisible(true);
        txtUsername.requestFocus();
    }

    public class btnLoginListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            username = txtUsername.getText();
            password = String.valueOf(txtPassword.getPassword());
            try (Connection connection = DriverManager.getConnection(url, username, password)) {
                JOptionPane.showMessageDialog(null, "Login Succeeded");
                connection.close();
                DBInsertData t = new DBInsertData(url, username, password);
                frame.setVisible(false);
            }
            catch(SQLException ex){
                JOptionPane.showMessageDialog(null, "Login Failed");
                txtPassword.setText("");
            }
        }
    }

    public class btnCancelListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            System.exit(0);
        }
    }

    public class btnClearListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            txtUsername.setText("");
            txtPassword.setText("");
            txtUsername.requestFocus();
        }
    }

    public class btnGuestListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e){
            username = "guest";
            password = "guest123";
            DBUserReport t = new DBUserReport(url, username, password);
            frame.setVisible(false);
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        DBLogin dbt = new DBLogin();
    }
}