Serialevent

Question

im having serialevent() in my class.i want it to be triggered when
a single byte comes in the serial port.For each single byte received
in the serial port i want the serialevent() to be triggerred.
In the simpleread program in the demo, in serial event() im getting group of bytes read from the serial port.kindly help me regarding this
import java.io.*;
import java.util.*;
import javax.comm.*;
public class SimpleRead implements Runnable, SerialPortEventListener {
static CommPortIdentifier portId;
static Enumeration portList;
InputStream inputStream;
SerialPort serialPort;
Thread readThread;
public static void main(String[] args) {
portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
if (portId.getName().equals("COM1")) {
// if (portId.getName().equals("/dev/term/a")) {
SimpleRead reader = new SimpleRead();
public SimpleRead() {
try {
serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
} catch (PortInUseException e) {}
try {
inputStream = serialPort.getInputStream();
} catch (IOException e) {}
try {
serialPort.addEventListener(this);
} catch (TooManyListenersException e) {}
serialPort.notifyOnDataAvailable(true);
try {
serialPort.setSerialPortParams(19200,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {}
readThread = new Thread(this);
readThread.start();
System.out.println("main thread exited");
public void run() {
try {
Thread.sleep(20000);
} catch (InterruptedException e) {}
public void serialEvent(SerialPortEvent event) {
switch(event.getEventType()) {
case SerialPortEvent.BI:
case SerialPortEvent.OE:
case SerialPortEvent.FE:
case SerialPortEvent.PE:
case SerialPortEvent.CD:
case SerialPortEvent.CTS:
case SerialPortEvent.DSR:
case SerialPortEvent.RI:
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
break;
case SerialPortEvent.DATA_AVAILABLE:
byte[] readBuffer = new byte[120];
int numBytes=0;
try {
while (inputStream.available() > 0) {
numBytes = inputStream.read(readBuffer);
for(int i=0;i<numBytes;i++)
System.out.print(new String(readBuffer,i,1));
// System.out.print(new String(readBuffer));
} catch (IOException e) {}
break;
}

Answer 1

Have a StringBuffer as a class variable, and each time you get a serial event, append the new bytes:
public class RecieveBuffer
    private StringBuffer buffer=new StringBuffer();
    /** put data into buffer */
    public void receive(byte[] data)
        buffer.append(new String(data));
    /** get accumulated data */
    public String getData()
        return buffer.toString();
    /** clear out old data */
    public void clear()
        buffer.setLength(0);
}