//: ChatterClient.java
//////////////////////////////////////////////////
// Copyright (c) Bruce Eckel, 1998
// Source code file from the book "Thinking in Java"
// All rights reserved EXCEPT as allowed by the
// following statements: You can freely use this file
// for your own work (personal or commercial),
// including modifications and distribution in
// executable form only. Permission is granted to use
// this file in classroom situations, including its
// use in presentation materials, as long as the book
// "Thinking in Java" is cited as the source.
// Except in classroom situations, you cannot copy
// and distribute this code; instead, the sole
// distribution point is http://www.BruceEckel.com
// (and official mirror sites) where it is
// freely available. You cannot remove this
// copyright and notice. You cannot distribute
// modified versions of the source code in this
// package. You cannot use this file in printed
// media without the express permission of the
// author. Bruce Eckel makes no representation about
// the suitability of this software for any purpose.
// It is provided "as is" without express or implied
// warranty of any kind, including any implied
// warranty of merchantability, fitness for a
// particular purpose or non-infringement. The entire
// risk as to the quality and performance of the
// software is with you. Bruce Eckel and the
// publisher shall not be liable for any damages
// suffered by you or any third party as a result of
// using or distributing software. In no event will
// Bruce Eckel or the publisher be liable for any
// lost revenue, profit, or data, or for direct,
// indirect, special, consequential, incidental, or
// punitive damages, however caused and regardless of
// the theory of liability, arising out of the use of
// or inability to use software, even if Bruce Eckel
// and the publisher have been advised of the
// possibility of such damages. Should the software
// prove defective, you assume the cost of all
// necessary servicing, repair, or correction. If you
// think you've found an error, please email all
// modified files with clearly commented changes to:
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// address for non-code errors found in the book.)
/////////////////////////////////////////////////
// Tests the ChatterServer by starting multiple
// clients, each of which sends datagrams.
import java.lang.Thread;
import java.net.*;
import java.io.*;
public class ChatterClient extends Thread {
// Can listen & send on the same socket:
private DatagramSocket s;
private InetAddress hostAddress;
private byte[] buf = new byte[1000];
private DatagramPacket dp =
new DatagramPacket(buf, buf.length);
private int id;
public ChatterClient(int identifier) {
id = identifier;
try {
// Auto-assign port number:
s = new DatagramSocket();
hostAddress =
InetAddress.getByName("localhost");
} catch(UnknownHostException e) {
System.err.println("Cannot find host");
System.exit(1);
} catch(SocketException e) {
System.err.println("Can't open socket");
e.printStackTrace();
System.exit(1);
}
System.out.println("ChatterClient starting");
}
public void run() {
try {
for(int i = 0; i < 25; i++) {
String outMessage = "Client #" +
id + ", message #" + i;
// Make and send a datagram:
s.send(Dgram.toDatagram(outMessage,
hostAddress,
ChatterServer.INPORT));
// Block until it echoes back:
s.receive(dp);
// Print out the echoed contents:
String rcvd = "Client #" + id +
", rcvd from " +
dp.getAddress() + ", " +
dp.getPort() + ": " +
Dgram.toString(dp);
System.out.println(rcvd);
}
} catch(IOException e) {
e.printStackTrace();
System.exit(1);
}
}
public static void main(String[] args) {
for(int i = 0; i < 10; i++)
new ChatterClient(i).start();
}
} ///:~ |