Mega Code Archive
UDP Echo Client
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
public class MainClass {
public static void main(String[] args) throws Exception {
String hostname = "localhost";
InetAddress ia = InetAddress.getByName(hostname);
SenderThread sender = new SenderThread(ia, 1919);
sender.start();
Thread receiver = new ReceiverThread(sender.getSocket());
receiver.start();
}
}
class SenderThread extends Thread {
private InetAddress server;
private DatagramSocket socket;
private boolean stopped = false;
private int port;
public SenderThread(InetAddress address, int port) throws SocketException {
this.server = address;
this.port = port;
this.socket = new DatagramSocket();
this.socket.connect(server, port);
}
public void halt() {
this.stopped = true;
}
public DatagramSocket getSocket() {
return this.socket;
}
public void run() {
try {
BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));
while (true) {
if (stopped)
return;
String theLine = userInput.readLine();
if (theLine.equals("."))
break;
byte[] data = theLine.getBytes();
DatagramPacket output = new DatagramPacket(data, data.length, server, port);
socket.send(output);
Thread.yield();
}
}
catch (IOException ex) {
System.err.println(ex);
}
}
}
class ReceiverThread extends Thread {
DatagramSocket socket;
private boolean stopped = false;
public ReceiverThread(DatagramSocket ds) throws SocketException {
this.socket = ds;
}
public void halt() {
this.stopped = true;
}
public void run() {
byte[] buffer = new byte[65507];
while (true) {
if (stopped)
return;
DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
try {
socket.receive(dp);
String s = new String(dp.getData(), 0, dp.getLength());
System.out.println(s);
Thread.yield();
} catch (IOException ex) {
System.err.println(ex);
}
}
}
}
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