contoh coding Login di Netbeans.net

Dibawah ini adalah contoh Code Login

package mnuFile;
import Class.clsCRUDDBase;
/** clsCRUDDBase adalah sebuah class untuk pengambilan data dari data base*/
import Class.sessionLogin;
import java.sql.ResultSet;
import javax.swing.JOptionPane;
import javax.swing.JRootPane;


/**
 *
 * @author Jack
 */
public class Login extends javax.swing.JFrame {

    /**
     * Creates new form Login
     */
/**
*Buat dulu method supaya kita tinggal memanggil nya saja
*/
    public Login() {
        setUndecorated(true);
        getRootPane().setWindowDecorationStyle(JRootPane.NONE);
        initComponents();
        this.setLocationRelativeTo(this);
    }
 
    private void signin(){
     
        String username = tUser.getText();
        String password = tPass.getText();
     
        try{
            String SQL = "select user,pass,id_kasir,nama from kasir where user='"+username+"' and pass = '"+password+"'";
            ResultSet rs = clsCRUDDBase.executeQuery(SQL);
            if(rs.next()){
                sessionLogin sesi = new sessionLogin();
                sesi.setIdKasir(rs.getString(3));
                sesi.setNamaKasir(rs.getString(4));
                sesi.setUsername(rs.getString(1));
                this.dispose();
                new main.mnuUtama().setVisible(true);
            }else{
                JOptionPane.showMessageDialog(rootPane, "Periksa kembali\nUsername & Password\nYang anda masukan!");
            }
        }catch(Exception e){
            System.out.println(e);
        }
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        tUser = new javax.swing.JTextField();
        btnLogin = new javax.swing.JButton();
        btnKeluar = new javax.swing.JButton();
        jLabel4 = new javax.swing.JLabel();
        tPass = new javax.swing.JPasswordField();

        setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
        setBackground(new java.awt.Color(255, 255, 255));

        jPanel1.setBackground(new java.awt.Color(153, 153, 153));

        jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/img/1484814176_thefreeforty_register.png"))); // NOI18N

        jLabel2.setText("Username :");

        jLabel3.setText("Password :");

        btnLogin.setText("Login");
        btnLogin.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnLoginActionPerformed(evt);
            }
        });

        btnKeluar.setText("Keluar");
        btnKeluar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnKeluarActionPerformed(evt);
            }
        });

        jLabel4.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
        jLabel4.setText("LOGIN");

        tPass.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                tPassActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addGap(18, 18, 18)
                        .addComponent(tUser, javax.swing.GroupLayout.PREFERRED_SIZE, 133, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 28, Short.MAX_VALUE)
                                .addComponent(btnLogin)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(btnKeluar))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addGap(20, 20, 20)
                                .addComponent(tPass)))))
                .addGap(20, 20, 20))
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(111, 111, 111)
                .addComponent(jLabel4)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel4)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(tUser, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel2))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel3)
                            .addComponent(tPass, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(14, 14, 14)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(btnLogin)
                            .addComponent(btnKeluar)))
                    .addComponent(jLabel1))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void btnKeluarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnKeluarActionPerformed
        // TODO add your handling code here:
        if(JOptionPane.showConfirmDialog(rootPane, "Apakah anda ingin keluar ?",
            "Informasi",JOptionPane.CANCEL_OPTION,
            JOptionPane.INFORMATION_MESSAGE)==JOptionPane.OK_OPTION)System.exit(0);
    }//GEN-LAST:event_btnKeluarActionPerformed

    private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnLoginActionPerformed
        // TODO add your handling code here:
        signin();
     
    }//GEN-LAST:event_btnLoginActionPerformed

    private void tPassActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_tPassActionPerformed
        // TODO add your handling code here:
        signin();
    }//GEN-LAST:event_tPassActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Login().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton btnKeluar;
    private javax.swing.JButton btnLogin;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPasswordField tPass;
    private javax.swing.JTextField tUser;
    // End of variables declaration//GEN-END:variables
}