Java - Writing to serial port using Java Communication API

	import java.io.IOException;
	import java.io.OutputStream;
	import java.util.Enumeration;
	import javax.comm.CommPortIdentifier;
	import javax.comm.PortInUseException;
	import javax.comm.SerialPort;
	import javax.comm.UnsupportedCommOperationException;

	/**
	 *
	 * @author dhanoopbhaskar
	 */
	public class SerialPortWriter {

	    Enumeration portList;
	    CommPortIdentifier portIdentifier;
	    String message;
	    SerialPort serialPort;
	    OutputStream outputStream;
	    String portName = "";

	    public SerialPortWriter(String portName) {
	        this.portName = portName;
	        /**
	         * gets a list of ports
	         */
	        portList = CommPortIdentifier.getPortIdentifiers();


	        while (portList.hasMoreElements()) {

	            portIdentifier = (CommPortIdentifier) portList.nextElement();
	            /**
	             * check whether the port is serial
	             */
	            if (portIdentifier.getPortType() == CommPortIdentifier.PORT_SERIAL) {

	                /**
	                 * check whether the port name is portName (eg.COM1)
	                 */
	                if (portIdentifier.getName().equals(portName)) {
	                    try {
	                        /**
	                         * String - application name
	                         * int - time out value
	                         */
	                        serialPort = (SerialPort) portIdentifier.open("SerialPortWriter", 2000);
	                    } catch (PortInUseException ex) {
	                        System.out.println("#1 " + ex);
	                    }

	                    try {
	                        outputStream = serialPort.getOutputStream();
	                    } catch (IOException ex) {
	                        System.out.println("#2 " + ex);
	                    }

	                    try {
	                        /**
	                         * int baudrate
	                         * int dataBits
	                         * int stopBits
	                         * int parity
	                         */
	                        serialPort.setSerialPortParams(9600,
	                                SerialPort.DATABITS_8,
	                                SerialPort.STOPBITS_1,
	                                SerialPort.PARITY_NONE);

	                        serialPort.setDTR(true);
	                    } catch (UnsupportedCommOperationException ex) {
	                        System.out.println("#3 " + ex);
	                    }
	                }
	            }
	        }
	    }

	    public void sendMessage(String message) {

	        try {
	            outputStream.write(message.getBytes());
	        } catch (IOException ex) {
	            System.out.println(ex);
	        }
	    }

	    public void close() {
	        serialPort.close();
	    }
	}