Membaca data port serial di Java (RxTx Library)

Cara membaca data dari port serial pada java adalah dengan menambahkan library rx tx caranya :

1. Download library rxtx pada link berikut : http://rxtx.qbang.org/pub/rxtx/rxtx-2.1-7-bins-r2.zip
2. Extract file rxtx-2.1-7-bins-r2.zip
3. Copy file bernama RXTXcomm.jar ke C:\Program Files\Java\jdk1.7.0_04\jre\lib
4. Copy file bernama rxtx-2.1-7-bins-r2\Windows\i368-mingw32\rxtxSerial.dll ke C:\Program Files\Java\jdk1.7.0_04\jre\bin
5. Source Code on NetBeans IDE 7.1 :

package rfid;

import gnu.io.*;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.TooManyListenersException;

public class RFID implements Runnable, SerialPortEventListener {
    static CommPortIdentifier portId;
    static Enumeration portList;

InputStream inputStream;
SerialPort serialPort;
Thread readThread;
byte[] readBuffer;

public static void main(String[] args) {
    portList = CommPortIdentifier.getPortIdentifiers();
    System.out.println("portList... " + portList);
    portId = (CommPortIdentifier) portList.nextElement();
    if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL){
        if (portId.getName().equals("COM1")){
            System.out.println("port identified is "+ portId.getName());
            RFID reader = new RFID();
        } else {
            System.out.println("Unable to open port");
        }
   }
}

public RFID() {
    try {
        System.out.println("Initialitation Port");
        serialPort = (SerialPort) portId.open("COM1",500);
        System.out.println(" Serial Port.. " + serialPort);
    } catch (PortInUseException e) {
        System.out.println("Exception in Initialitation Port");
    }
    try {
        inputStream = serialPort.getInputStream();
        System.out.println("Initialitation Input Stream");
    } catch (IOException e) {
        System.out.println("Exception in Input Stream");
    }
    try {
        serialPort.addEventListener(this);

    } catch (TooManyListenersException e) {
        System.out.println("Too many Listener exception");
    }
    serialPort.notifyOnDataAvailable(true);
    try {
        serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
        System.out.println("Inisialitation Baudrate");
    } catch (UnsupportedCommOperationException e) {
        System.out.println("Not supported operation");
    }
    readThread = new Thread(this);
    readThread.start();
}

public void run() {
    try {
        System.out.println("Run...");
        Thread.sleep(500);
    } catch (InterruptedException e) {
        System.out.println("Exception in run");
    }
}

public void serialEvent(SerialPortEvent event) {
    switch (event.getEventType()) {
    case SerialPortEvent.DATA_AVAILABLE:
        readBuffer = new byte[8];        
            try {
                while (inputStream.available()>0) {
                    int numBytes = inputStream.read(readBuffer);
                    System.out.print(new String(readBuffer));
                }

            } catch (Throwable ex) {
                System.out.println("Hardware Disconnected");
                System.exit(0);
            }
        break;
    }
}

}

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