Java RS232-Kommunikation mit Swing und RXTX

Question

Ich versuche, über den seriellen Anschluss zwischen meinem PC (Windows 7 mit Netbeans und RXTX) zu kommunizieren. Ich habe ein Prolem mit seriellem Ereignis (public void serialEvent (SerialPortEvent arg0)). Dieses Ereignis sollte die Daten empfangen und sie in label schreiben (jLabel1.setText ("sfazds")). Leider ändert dieser Event den Etikettentext nicht und ich weiß jetzt nicht warum. Unten ist mein Code:

import gnu.io.CommPort; 
import gnu.io.CommPortIdentifier; 
import gnu.io.SerialPort; 
import gnu.io.SerialPortEvent; 
import gnu.io.SerialPortEventListener; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import javax.swing.JLabel; 
import javax.swing.JOptionPane; 
import javax.swing.JPanel; 

public class RS extends javax.swing.JFrame implements SerialPortEventListener{ 

    static OutputStream out; 
    static InputStream in; 

    public RS() { 
     initComponents(); 
    } 

    /** 
    * 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">       
    private void initComponents() { 

     jButton1 = new javax.swing.JButton(); 
     jLabel1 = new javax.swing.JLabel(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
     addWindowListener(new java.awt.event.WindowAdapter() { 
      public void windowOpened(java.awt.event.WindowEvent evt) { 
       formWindowOpened(evt); 
      } 
     }); 

     jButton1.setText("jButton1"); 
     jButton1.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       jButton1ActionPerformed(evt); 
      } 
     }); 

     jLabel1.setText("jLabel1"); 

     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(layout.createSequentialGroup() 
         .addGap(54, 54, 54) 
         .addComponent(jButton1)) 
        .addGroup(layout.createSequentialGroup() 
         .addGap(203, 203, 203) 
         .addComponent(jLabel1))) 
       .addContainerGap(217, Short.MAX_VALUE)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addGap(21, 21, 21) 
       .addComponent(jButton1) 
       .addGap(34, 34, 34) 
       .addComponent(jLabel1) 
       .addContainerGap(222, Short.MAX_VALUE)) 
     ); 

     pack(); 
    }// </editor-fold>       

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {           
     byte[] b = new byte[2]; 
     b[0] = 'a'; 
     b[1] = 'b'; 
     try{ 
      out.write(b); 
     } 
     catch(Exception e){ 
      e.printStackTrace(); 
     } 
    }           

    private void formWindowOpened(java.awt.event.WindowEvent evt) {         
     try{ 
      (new RS()).connect("COM3"); 
     } 
     catch(Exception e){ 
      e.printStackTrace(); 
     } 
    }         

    void connect(String portName) throws Exception{ 
     CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName); 
     if (portIdentifier.isCurrentlyOwned()){ 
      JOptionPane.showMessageDialog(null, "Błąd: Port jest obecnie w użyciu"); 
     } 
     else{ 
      CommPort commPort = portIdentifier.open(this.getClass().getName(), 2000); 
      if (commPort instanceof SerialPort){ 
       SerialPort serialPort = (SerialPort) commPort; 
       serialPort.setSerialPortParams(57600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE); 

       in = serialPort.getInputStream(); 
       out = serialPort.getOutputStream(); 

       (new Thread(new SerialWriter(out))).start(); 
       serialPort.addEventListener(this); 
       serialPort.notifyOnDataAvailable(true); 
      }  
      else{ 
       JOptionPane.showMessageDialog(null, "Tylko port szeregowy może być podłączony!"); 
      } 
     } 
    } 
    @Override 
    public void serialEvent(SerialPortEvent arg0) { 
      int data; 
      byte[] buffer = new byte[1024]; 
      try{ 
       int len = 0; 
       while ((data = in.read()) > -1){ 
        if (data == '\n') { 
         break; 
        } 
        buffer[len++] = (byte) data; 
       } 
       System.out.print(new String(buffer,0,len)); 
       jLabel1.setText("sfazds"); 
       JOptionPane.showMessageDialog(null, new String(buffer,0,len)); 
      } 
      catch (IOException e){ 
       System.exit(-1); 
      }    
     } 

    public static class SerialWriter implements Runnable{ 
     OutputStream out; 

     public SerialWriter(OutputStream out){ 
      this.out = out; 
     } 

     @Override 
     public void run(){ 
      try{ 
       int c = 0; 
       while ((c = System.in.read()) > -1){ 
        this.out.write(c); 
       } 
      } 
      catch(IOException e){ 
       System.exit(-1); 
      } 
     } 
    } 

    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(RS.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (InstantiationException ex) { 
      java.util.logging.Logger.getLogger(RS.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (IllegalAccessException ex) { 
      java.util.logging.Logger.getLogger(RS.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(RS.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 RS().setVisible(true); 
      } 
     }); 
    } 

    // Variables declaration - do not modify      
    private javax.swing.JButton jButton1; 
    private javax.swing.JLabel jLabel1; 
    // End of variables declaration     
} 

Answer 1

Ihr Ausgang wird wahrscheinlich mit dem EventDispatcherTread nicht synchronisiert. Versuchen Sie folgendes:

SwingUtilities.invokeLater(new Runnable() { 

     @Override 
     public void run() { 
      jLabel1.setText("sfazds"); 
     } 
    });