UDP Sender and Receiver.

Question

Hi! I want to know if it is possible to convert the file UDPSender.java into a method that can be called by clicking a button? I slightly modified the UDPReceiver.java for it to be listening indefinitely and UDPSender.java I found on the net. And I created a what is supposedly my main file called Button.java.
What I want to do is that for this Button.java which only has a button when clicked is supposed to do a UDPSender. But I have no idea how to do it. Hope someone can answer this.
====================================================================================================================
====================================================================================================================
The code below is for UDPReceiver.java
====================================================================================================================
====================================================================================================================
* @(#)UDPReceiver.java
* @author
* @version 1.00 2008/10/19
import java.net.*;
import java.util.*;
import java.io.*;
public class UDPReceiver {
     * Creates a new instance of <code>UDPReceiver</code>.
    public UDPReceiver() {
     * @param args the command line arguments
    public static void main(String args[]){
        try{
             //Bound to socket 7 for receive
             DatagramSocket socket = new DatagramSocket(7);
             System.out.println("Bound to local port " +socket.getLocalPort());
             while(true){
                  //Create packet of 512 byte length
                  DatagramPacket packet = new DatagramPacket(new byte[512], 512);
                  socket.receive(packet);
                  System.out.println("Packet received at " +new Date());
                  //Display packet information
                  InetAddress remote_addr = packet.getAddress();
                  System.out.println("Sender: " +remote_addr.getHostAddress());
                  System.out.println("from Port: " +packet.getPort());
                  //Display packet contents, by reading from byte array
                  ByteArrayInputStream bin = new ByteArrayInputStream(packet.getData());
                  //Display only up to the length of the original UDP packet
                     for(int i=0; i<packet.getLength(); i++){
                       int data = bin.read();
                       if(data==-1)
                            break;
                       else
                            System.out.println((char)data);
        catch (IOException e) {
               System.out.println ("Error - " + e);
}====================================================================================================================
====================================================================================================================
This code is for UDPSender.java
====================================================================================================================
====================================================================================================================
* @(#)UDPSender.java
* @author
* @version 1.00 2008/10/19
import java.net.*;
import java.util.*;
import java.io.*;
public class UDPSender {
     * Creates a new instance of <code>UDPSender</code>.
    public UDPSender() {   
     * @param args the command line arguments
     public static void main(String args[]){
         //Set hostname and message
        String hostname = "localhost";
        String message = "Hello";
        try{
             //Create a datagram socket and look for the first available port
             DatagramSocket socket = new DatagramSocket();
             System.out.println("Using local port: " +socket.getLocalPort());
             ByteArrayOutputStream bOut = new ByteArrayOutputStream();
             PrintStream pOut = new PrintStream(bOut);
             pOut.print(message);
             //Convert printstream to byte array
             byte[] bArray = bOut.toByteArray();
             //Create a datagram packet containing a maximum buffer of 512 bytes
             DatagramPacket packet = new DatagramPacket(bArray, bArray.length);
             System.out.println("Looking for hostname " +hostname);
             //Get the InetAddress object
             InetAddress remote_addr = InetAddress.getByName(hostname);
             //Check host IP
             System.out.println("Hostname has IP address = " +remote_addr.getHostAddress());
             //Configure DatagramPacket
             packet.setAddress(remote_addr);
             packet.setPort(7);
             //Send packet
             socket.send(packet);
             System.out.println("Packet sent at " +new Date());
             //Display packet information
             System.out.println("Sent by: " +remote_addr.getHostAddress());
             System.out.println("Send from: " +packet.getPort());      
         catch (UnknownHostException ue){
               System.out.println("Unknown host "+hostname);
          catch (IOException e) {
               System.out.println ("Error - " + e);
}====================================================================================================================
====================================================================================================================
This is supposedly my main class file:
====================================================================================================================
====================================================================================================================
* @(#)Button.java
* @author
* @version 1.00 2008/10/16
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.Applet.*;
public class Button extends JApplet implements ActionListener{
     public static void main(String[] args){
     JFrame frame = new JFrame();
     frame.setVisible(true);
     JPanel panel = new JPanel();
     JButton button = new JButton("send text");
     panel.add(button);
     frame.add(panel);
     frame.pack();
     public void actionPerformed(ActionEvent evt) {
          //Button.EchoClient();
}Edited by: Eastsheen on Oct 20, 2008 12:33 AM

Answer 1

You could call UDPSender.main(new String[0])