serial class

package testlist;


/**
 *
 * @author Atulmaharaj
 */
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.util.Enumeration;
public class SerialClass implements SerialPortEventListener {

 public SerialPort serialPort;
 /** The port we're normally going to use. */
 private static final String PORT_NAMES[] = {
 "/dev/tty.usbserial-A9007UX1", // Mac OS X
 "/dev/ttyUSB0", // Linux
 "COM3", // Windows
 };

public static BufferedReader input;
public static OutputStream output;
 /** Milliseconds to block while waiting for port open */
 public static final int TIME_OUT = 2000;
 /** Default bits per second for COM port. */
 public static final int DATA_RATE = 9600;

public void initialize() {
 CommPortIdentifier portId = null;
 Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

//First, Find an instance of serial port as set in PORT_NAMES.
 while (portEnum.hasMoreElements()) {
 CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
 for (String portName : PORT_NAMES) {
 if (currPortId.getName().equals(portName)) {
 portId = currPortId;
 break;
 }
 }
 }
 if (portId == null) {
 System.out.println("Could not find COM port.");
 return;
 }

try {
 // open serial port, and use class name for the appName.
 serialPort = (SerialPort) portId.open(this.getClass().getName(),
 TIME_OUT);

// set port parameters
 serialPort.setSerialPortParams(DATA_RATE,
 SerialPort.DATABITS_8,
 SerialPort.STOPBITS_1,
 SerialPort.PARITY_NONE);

// open the streams
 input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
 output = serialPort.getOutputStream();
 char ch = 1;
 output.write(ch);


 // add event listeners
 serialPort.addEventListener(this);
 serialPort.notifyOnDataAvailable(true);
 } catch (Exception e) {
 System.err.println(e.toString());
 }
 }

public synchronized void close() {
 if (serialPort != null) {
 serialPort.removeEventListener();
 serialPort.close();
 }
 }

public synchronized void serialEvent(SerialPortEvent oEvent) {
 if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
 try {
 String inputLine=input.readLine();
 System.out.println(inputLine);
 } catch (Exception e) {
 System.err.println(e.toString());
 }
 }

 }

 public static synchronized void writeData(String data) {
 //System.out.println("Sent: " + data);
 try {
 output.write(data.getBytes());
 } catch (Exception e) {
 System.out.println("could not write to port");
 }
 }

public static void main(String[] args) throws Exception {
 SerialClass main = new SerialClass();
 main.initialize();
 Thread t=new Thread() {
 public void run() {
 //the following line will keep this app alive for 1000 seconds,
 //waiting for events to occur and responding to them (printing incoming messages to console).
 try {Thread.sleep(1500);
 writeData("2");} catch (InterruptedException ie) {}
 }
 };
 t.start();
 System.out.println("Started");
 }
}