Datagram Sender


import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.Datagram;
import javax.microedition.io.DatagramConnection;

public class DatagramSender {
public static void main(String[] args) {
if (args.length != 2) {
System.out.println("Usage: DatagramSender port length");
System.exit(1);
}

try {
DatagramConnection sender =
(DatagramConnection)Connector.open("datagram://localhost:" + args[0]);
int length = Integer.parseInt(args[1]);
byte[] buffer = new byte[length];
for (int i = 0; i < length; i++) { buffer[i] = (byte)('0' + (i % 10)); } Datagram dgram = sender.newDatagram(buffer, buffer.length); sender.send(dgram); // Wait for the packet to be returned for (int i = 0; i < length; i++) { buffer[i] = (byte)0; } sender.receive(dgram); length = dgram.getLength(); System.out.println("Received return packet, length is " + length); // Show the content of the datagram. for (int i = 0; i < length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } catch (IOException ex) { System.out.println("IOException: " + ex); } } }