Cara Membuat Menu Login di Java dengan MySQL

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import javax.swing.JOptionPane;

/**
 *
 * @author www.kangsunu.web.id
 */
public class Koneksi {
    private Connection connection;

    public Connection getConnection() {
        return connection;
    }

    public void dbConnection() { //<-- untuk koneksi ke database
        // Cek Driver
        try {
            Class.forName("com.mysql.jdbc.Driver"); //<-- nama driver untuk koneksi ke MySQL

            // Cek Database
            try {
                String url, user, password;
                url = "jdbc:mysql://localhost:3306/java_login"; //alamat DB
                user = "root";
                password = "";
                connection = DriverManager.getConnection(url, user, password);

                System.out.println("Koneksi Sukses");
            } catch (SQLException se) {
                JOptionPane.showMessageDialog(null, "Koneksi Gagal! " + se);
                System.exit(0);
            }
        } catch (ClassNotFoundException cnfe) {
            JOptionPane.showMessageDialog(null, "Driver Tidak Ditemukan!" + cnfe);
            System.exit(0);
        }
    }

    public static void main(String[] kon) {
        new Koneksi().dbConnection();
    }
}

*keterangan:
JTextField = txtUsername
JPasswordField = txtPassword
JButton = btnLogin

private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        db.koneksiDatabase();
        try {
            String sql = "SELECT * FROM users WHERE username = '" + txtUsername.getText() + "' AND password = '" + txtPassword.getText() + "'";
            Statement st = db.getKoneksi().createStatement();
            ResultSet rsLogin = st.executeQuery(sql);

            rsLogin.next();
            rsLogin.last(); //mengecek jumlah baris pada hasil query
            if (rsLogin.getRow()==1){
                JOptionPane.showMessageDialog(null, "Login Berhasil!");
                // new FrmMenuUtama().setVisible(true); //<-- BILA MAU DIARAHKAN KE Frame Menu Utama
                this.dispose();
            } else {
                JOptionPane.showMessageDialog(null, "Maaf, Username / Password salah!");
                txtPassword.setText("");
                txtPassword.requestFocus();
            }
        } catch (SQLException e) {
        }
    }

public class FrmLogin extends javax.swing.JFrame {
    private Connection koneksi;
    private KoneksiDB db = new KoneksiDB();

• Cara Membuat Login Aplikasi Java dengan NetBeans
• Cara Mengkoneksikan Aplikasi Java dengan Database MySQL
• Membuat Menu Login di Java
• Menu Login dengan MySQL di Java