Fórum serial #415774

import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 *
 * @author dmrocha
 */
public class TwoWaySerialComm {

    public TwoWaySerialComm() {
        super();
    }

    void connect(String portName) throws Exception {
        CommPortIdentifier portIdentifier =
                CommPortIdentifier.getPortIdentifier(portName);
        if (portIdentifier.isCurrentlyOwned()) {
            System.out.println(Error: `port is currently in use);
        } else {
            CommPort commPort = portIdentifier.open(this.getClass().getName(), 2000);
            if (commPort instanceof SerialPort) {
                SerialPort serialPort = (SerialPort) commPort;
                serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                InputStream in = serialPort.getInputStream();
                OutputStream out = serialPort.getOutputStream();
                (new Thread(new SerialReader(in))).start();
                (new Thread(new SerialWriter(out))).start();
            } else {
                System.out.println(Error: only serial ports are handled by this example.);
            }
        }
    }

    void disconnect (String portName) throws Exception
    {
        CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
        if (portIdentifier.isCurrentlyOwned()){
            CommPort commPort = portIdentifier.open(this.getClass().getName(), 2000);
            commPort.close();
        }
            
    }
    public static class SerialReader implements Runnable {

        InputStream in;

        public SerialReader(InputStream in) {
            this.in = in;
        }

        public void run() {
            byte[] buffer = new byte[1024];
            int len = -1;
            try {
                Principal principal = new Principal();

                while ((len = this.in.read(buffer)) > -1) {
                    System.out.print(new String(buffer, 0, len));
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static class SerialWriter implements Runnable {

        OutputStream out;

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

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