Source Code : Timer Server

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Timer Server

/*
J2ME in a Nutshell
By Kim Topley
ISBN: 0-596-00253-X

*/


import java.io.InterruptedIOException;
import javax.microedition.io.Connector;
import javax.microedition.io.Datagram;
import javax.microedition.io.DatagramConnection;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class TimeMIDlet extends MIDlet
                    implements CommandListener, Runnable {

    private Display display;
    private Form addressForm;
    private Form connectForm;
    private Form displayForm;
    private Command backCommand;
    private Command exitCommand;
    private Command okCommand;
    private StringItem messageLabel;
    private TextField serverName;

    protected void startApp() throws MIDletStateChangeException {
        if (display == null) {
            initialize();
            display.setCurrent(addressForm);
        }
    }

    protected void pauseApp() {
    }

    protected void destroyApp(boolean unconditional)
                        throws MIDletStateChangeException {
    }

    public void commandAction(Command cmd, Displayable d) {
        if (cmd == okCommand) {
            Thread t = new Thread(this);
            t.start();
        } else if (cmd == backCommand) {
            display.setCurrent(addressForm);
        } else if (cmd == exitCommand) {
            try {
                destroyApp(true);
            } catch (MIDletStateChangeException ex) {
            }
            notifyDestroyed();
        }
    }

    public void run() {
        DatagramConnection conn = null;
        display.setCurrent(connectForm);

        try {
            // Build the name string for the Connector open method
            String server = serverName.getString();
            String name = "datagram://" + server + ":" + 13;
            conn = (DatagramConnection)Connector.open(name,
                                    Connector.READ_WRITE, false);

            // Build and send an empty datagram
            Datagram dg = conn.newDatagram(10);
            dg.setData("Hello".getBytes(), 0, 5);
            conn.send(dg);

            // Receive the reply
            Datagram rdg = conn.newDatagram(512);
            conn.receive(rdg);
            messageLabel.setText(new String(rdg.getData(), 0, rdg.getLength()));
            display.setCurrent(displayForm);

        } catch (InterruptedIOException iex) {
            display.callSerially(new Runnable() {
                public void run() {
                    Alert alert = new Alert("No Reply",
                        "No reply was received.
" +
                        "Please check the server address and try again.", null,
                        AlertType.ERROR);
                    alert.setTimeout(Alert.FOREVER);
                    display.setCurrent(alert, addressForm);
                }
            });
            return;
        } catch (Exception ex) {
            display.callSerially(new Runnable() {
                public void run() {
                    Alert alert = new Alert("Invalid Address",
                        "The supplied address is invalid
" +
                        "Please correct it and try again.", null,
                        AlertType.ERROR);
                    alert.setTimeout(Alert.FOREVER);
                    display.setCurrent(alert, addressForm);
                }
            });
            return;
        } catch (Error err) {
            System.out.println(err);
            err.printStackTrace();
        }
    }

    private void initialize() {
        display = Display.getDisplay(this);

        // Commands
        exitCommand = new Command("Exit", Command.EXIT, 0);
        okCommand = new Command("OK", Command.OK, 0);
        backCommand = new Command("Back", Command.BACK, 0);

        // The address form
        addressForm = new Form("Network Time");
        serverName = new TextField("Time Server name:", "tock.usno.navy.mil",
                                            256, TextField.ANY);
        addressForm.append(serverName);
        addressForm.addCommand(okCommand);
        addressForm.addCommand(exitCommand);
        addressForm.setCommandListener(this);

        // The connect form
        connectForm = new Form("Sending");
        messageLabel = new StringItem(null,
                    "Sending the datagram...
Please wait.");
        connectForm.append(messageLabel);
        connectForm.addCommand(backCommand);
        connectForm.setCommandListener(this);

        // The display form
        displayForm = new Form("Server Reply");
        messageLabel = new StringItem(null, null);
        displayForm.append(messageLabel);
        displayForm.addCommand(backCommand);
        displayForm.setCommandListener(this);
    }
}

           
       

Thank with us