Java multithreading in JFrame

I want this code work with update JProgressBar and JTextArea while scanner is working, but I don't know how implement Threading. Is it possible?

This is my code:

UPDATED: It's a working version now, with "Stop" function. I added a "breakPoint" variable to break out from the for loop.

package main; import java.net.InetAddress; import java.net.InetSocketAddress; import java.net.Socket; import java.net.UnknownHostException; import javax.swing.JOptionPane; import javax.swing.SwingWorker; public class PortScanner extends javax.swing.JFrame { private doSomeStuff taskPortScanner; private boolean breakPoint; public PortScanner() { initComponents(); } private void portScan() { int currentPort = 1; try { String hostname = hostNameTextField.getText(); int timeOut = (Integer) timeOutSpinner.getValue(); int minPort = Integer.parseInt(portMinTextField.getText()); int maxPort = Integer.parseInt(portMaxTextField.getText()); //set min and max value of progress bar jProgressBar1.setMinimum(minPort); jProgressBar1.setMaximum(maxPort); //print out the address InetAddress theAddress = InetAddress.getByName(hostname); resultTextArea.append("IP adress: " + theAddress + "\n\n"); //check if port is open for (currentPort = minPort; currentPort <= maxPort; currentPort++) { //stop for loop if (breakPoint == true) { System.out.println("Portscanning stopped."); break; } try { Socket socket = new Socket(); socket.connect(new InetSocketAddress(hostname, currentPort), timeOut); //update textarea resultTextArea.append("Service running on port " + currentPort + "\n"); socket.close(); } catch (Exception ex) { System.out.println(currentPort); } //update progressbar jProgressBar1.setValue(currentPort); jProgressBar1.repaint(); } } catch (UnknownHostException ex) { JOptionPane.showMessageDialog(PortScanner.this, "Unknown hostname: " + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE); } catch (NumberFormatException ex) { JOptionPane.showMessageDialog(PortScanner.this, "Invalid format. " + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE); } catch (Exception ex) { JOptionPane.showMessageDialog(PortScanner.this, "Error: " + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE); } } private class doSomeStuff extends SwingWorker<Void, Void> { @Override public Void doInBackground() throws Exception { portScan(); return null; } @Override public void done() { //if thread is done enable start and clear buttons clearButton.setEnabled(true); startButton.setEnabled(true); } } @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); hostNameTextField = new javax.swing.JTextField(); portMinTextField = new javax.swing.JTextField(); jScrollPane1 = new javax.swing.JScrollPane(); resultTextArea = new javax.swing.JTextArea(); startButton = new javax.swing.JButton(); clearButton = new javax.swing.JButton(); portMaxTextField = new javax.swing.JTextField(); jProgressBar1 = new javax.swing.JProgressBar(); timeOutSpinner = new javax.swing.JSpinner(); jLabel4 = new javax.swing.JLabel(); stopButton = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("Simple port scanner"); setResizable(false); jLabel1.setText("Hostname"); jLabel2.setText("Timeout"); jLabel3.setText("Port range"); hostNameTextField.setToolTipText("Type a hostname like www.google.com"); portMinTextField.setText("1"); resultTextArea.setColumns(20); resultTextArea.setRows(5); jScrollPane1.setViewportView(resultTextArea); startButton.setText("Scan"); startButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { startButtonActionPerformed(evt); } }); clearButton.setText("Clear"); clearButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { clearButtonActionPerformed(evt); } }); portMaxTextField.setText("1000"); jProgressBar1.setStringPainted(true); timeOutSpinner.setModel(new javax.swing.SpinnerNumberModel(15, 0, 999999, 1)); jLabel4.setText("-"); stopButton.setText("Stop"); stopButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { stopButtonActionPerformed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel2) .addComponent(jLabel1)) .addGap(21, 21, 21) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(hostNameTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 112, javax.swing.GroupLayout.PREFERRED_SIZE) .addGroup(layout.createSequentialGroup() .addComponent(timeOutSpinner) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))) .addGroup(layout.createSequentialGroup() .addComponent(jLabel3) .addGap(18, 18, 18) .addComponent(portMinTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jLabel4) .addGap(12, 12, 12) .addComponent(portMaxTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE))) .addGap(0, 0, Short.MAX_VALUE)) .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(jProgressBar1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addContainerGap()) .addGroup(layout.createSequentialGroup() .addGap(30, 30, 30) .addComponent(startButton) .addGap(18, 18, 18) .addComponent(stopButton) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 46, Short.MAX_VALUE) .addComponent(clearButton) .addGap(32, 32, 32)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent(hostNameTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel2) .addComponent(timeOutSpinner, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel3) .addComponent(portMinTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(portMaxTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel4)) .addGap(18, 18, 18) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 157, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(18, 18, 18) .addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 23, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(startButton) .addComponent(clearButton) .addComponent(stopButton)) .addContainerGap()) ); pack(); }// </editor-fold> private void startButtonActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: breakPoint = false; taskPortScanner = new doSomeStuff(); taskPortScanner.execute(); startButton.setEnabled(false); clearButton.setEnabled(false); System.out.println("Starting portscanner..."); } private void clearButtonActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: resultTextArea.setText(null); jProgressBar1.setValue(0); System.out.println("Clearing results..."); } private void stopButtonActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: breakPoint = true; startButton.setEnabled(true); clearButton.setEnabled(true); } /** * @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(PortScanner.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(PortScanner.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(PortScanner.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(PortScanner.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 PortScanner().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton clearButton; private javax.swing.JTextField hostNameTextField; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JLabel jLabel4; private javax.swing.JProgressBar jProgressBar1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextField portMaxTextField; private javax.swing.JTextField portMinTextField; private javax.swing.JTextArea resultTextArea; private javax.swing.JButton startButton; private javax.swing.JButton stopButton; private javax.swing.JSpinner timeOutSpinner; // End of variables declaration }