unreported exception java.io.ioexception must be caught or declared to be thrown

[himaece]

Hi all,

I'm new to java n forum.....
I am developing java application that can read/write to comm port.
While i was reading i don't have any problem
but while write with timer i got this error .....
any one please help me....

Here is my code..

import java.io.*;
import java.util.*;
import javax.comm.*;
import java.util.Timer;
import java.util.TimerTask;

public class SimpleRead implements Runnable, SerialPortEventListener {
    static CommPortIdentifier portId;
    static Enumeration portList;
	String messageString = "AT+CMGL=" + '"' + "REC READ" + '"' + '\r' + '\n';
    InputStream inputStream;
	//public OutputStream outputStream;
	OutputStream outputStream;
    public SerialPort serialPort;
    Thread readThread;
	private int times = 0;
	//Thread writeThread;
    public static void main(String[] args) {
		portList = CommPortIdentifier.getPortIdentifiers();
		Timer timer = new Timer("Printer");
		MyTask t = new MyTask();
		timer.schedule(t, 0, 2000);
        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                 if (portId.getName().equals("COM9")) {
			//   if (portId.getName().equals("/dev/term/a")) {
                    SimpleRead reader = new SimpleRead();
                }
            }
        }
    }

    public SimpleRead() {
        try {
            serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
        } catch (PortInUseException e) {System.out.println(e);}
        try {
            inputStream = serialPort.getInputStream();
			outputStream = serialPort.getOutputStream();
        } catch (IOException e) {System.out.println(e);}
	try {
            serialPort.addEventListener(this);
	} catch (TooManyListenersException e) {System.out.println(e);}
        serialPort.notifyOnDataAvailable(true);
        try {
            serialPort.setSerialPortParams(19200,
                SerialPort.DATABITS_8,
                SerialPort.STOPBITS_1,
                SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e) {System.out.println(e);}
        readThread = new Thread(this);
        readThread.start();
    }

    public void run() {
        try {
			/*//private int times = 0;
			times++;
			if (times <= 15) {
            outputStream.write(messageString.getBytes());
			} else {
            System.out.println("Timer stops now...");
 
            //Stop Timer.
            t.cancel();
			}*/
            Thread.sleep(20000);
			} catch (InterruptedException e) {System.out.println(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[200];
			//String Str2 = "AT+CMGL=" + '"' + "REC UNREAD" + '"' ;
            try {
                while (inputStream.available() > 0) {
                    int numBytes = inputStream.read(readBuffer);
                }
                System.out.print(new String(readBuffer));
				/*if (outputStream.available() > 0)
				{
					outputStream.write(messageString.getBytes());
				}*/
				/*try
				{
					outputStream.write(messageString.getBytes());
				}
				catch (IOException e)
				{
					System.out.println(e);
				}*/
				//outputStream.writeBytes(Str2 + '\r' + '\n');
            } catch (IOException e) {System.out.println(e);}
			//try
			//{
			//	outputStream.write(messageString.getBytes());
			//}
			//catch (NullPointerException e)
			//{
			//	System.out.println(e);
			//}
            break;
        }
    }
	
}
class MyTask extends TimerTask {
	//OutputStream outputStream;
	//String messageString = "AT+CMGL=" + '"' + "REC READ" + '"' + '\r' + '\n';
    //times member represent calling times.
    private int times = 0;
	//outputStream = serialPort.getOutputStream();
 
    public void run() {
        times++;
        if (times <= 15) {
			/*try
			{
				outputStream.write(messageString.getBytes());
			}
			catch (IOException e)
			{
				System.out.println(e);
			}*/
            
			outputStream.write(messageString.getBytes());
			System.out.println("Timer is alive...");
        } else {
            System.out.println("Timer stops now...");
 
            //Stop Timer.
            this.cancel();
        }
    }
}

[DarrylBurke]

Moved from Advanced Java.

Please post your code in [code][/code] tags so that it retains its formatting.

Go through the Exceptions and Basic I/O parts of this tutorial: Trail: Essential Classes (The Java™ Tutorials)

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