contoh script login dengan Java

try {
            Connection con = koneksi.Koneksi();
            String sql = "Select * from user where u_name = '" + jTextField1.getText().trim() + "'" + "and u_pass = '" + jTextField2.getText + "'";
            Statement stat = con.createStatement();
            ResultSet res = stat.executeQuery(sql);
            if (res.next()) { //cek inputan, jika cocok maka akan dialihkan ke Form HalamanUtama()
                JOptionPane.showMessageDialog(null, "Anda Berhasil Login!", "Peringatan", JOptionPane.INFORMATION_MESSAGE);
                new HalamanUtama().setVisible(true);
                dispose(); //untuk menyembunyikan form ini
            } else {
                JOptionPane.showMessageDialog(null, "Anda Gagal Login!", "Peringatan", JOptionPane.WARNING_MESSAGE);
                jTextField1.requestFocusInWindow();
                jTextField1.setText("");
                jTextField2.setText("");
            }
        } catch (Exception ex) {
            System.out.println("kesalahan :" + ex.toString());
        }