Communicating jsp with serial port

Question

Hi, I'm developing an web application that needs to communicate with Serial port. I'm not getting how to communicate with Serial port. I'm building application using jsp. Any one help me Please...

Answer 1

package serialio;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.TooManyListenersException;
import javax.comm.CommPortIdentifier;
import javax.comm.PortInUseException;
import javax.comm.SerialPort;
import javax.comm.SerialPortEventListener;
import javax.comm.SerialPortEvent;
import javax.comm.UnsupportedCommOperationException;
* @author SASH
public class SimpleWrite
implements Runnable, SerialPortEventListener {
public String line = "";
public String line1 = "";
public String text1 = "";
public String text2 = "";
public void run() {
static Enumeration portList;
static CommPortIdentifier portId;
// static String dest = "0517111930";
static String messageString = "Hello";
InputStream inputStream;
static SerialPort serialPort;
static OutputStream outputStream;
public void serialEvent(SerialPortEvent event) {
switch (event.getEventType()) {
case SerialPortEvent.DATA_AVAILABLE: {
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
try {
while ((line = reader.readLine()) != null) {
arata(line);
// System.out.println(line);
} catch (IOException e) {
System.err.println("Error while reading Port " + e);
break;
} //switch
public int getWrite(SerialPort serial) {
try {
inputStream = serial.getInputStream();
outputStream = serial.getOutputStream();
try {
serial.addEventListener(this);
} catch (TooManyListenersException e) {
System.out.println("Exception in Adding Listener" + e);
serial.notifyOnDataAvailable(true);
} catch (Exception ex) {
System.out.println("Exception in getting InputStream" + ex);
return 0;
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("COM3")) {
try {
serialPort = (SerialPort) portId.open("SimpleWriteApp", 9600);
SimpleWrite wr = new SimpleWrite();
System.out.println(wr.getWrite(serialPort));
} catch (PortInUseException e) {
System.out.println("Port In Use " + e);
try {
outputStream = serialPort.getOutputStream();
return;
} catch (IOException e) {
System.out.println("Error writing to output stream " + e);
try {
serialPort.setSerialPortParams(
9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {
public String arata(String line) {
System.out.println(line);
if (line == null ? "250075C54CD9" == null : line.equals("250075C54CD9")) {
System.out.println(text1);
return "250075C54CD9";
} else if (line == null ? "1D00451A3270" == null : line.equals("1D00451A3270")) {
System.out.println(text2);
return "1D00451A3270";
return line;
this code is working correct getting output at system output terminal but i want use further in as input for my jsp how to get this ?.......
arata method is also working correct in class but it is not returnig value in jsp?
plz give me way how to take string as input ...........