67 lines
1.9 KiB
Java
67 lines
1.9 KiB
Java
// network/ChatterClient.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// {ValidateByHand}
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// Tests the ChatterServer by starting multiple
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// clients, each of which sends datagrams.
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import java.net.*;
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import java.io.*;
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import onjava.*;
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public class ChatterClient extends Thread {
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// Can listen & send on the same socket:
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private DatagramSocket s;
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private InetAddress hostAddress;
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private byte[] buf = new byte[1000];
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private DatagramPacket dp =
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new DatagramPacket(buf, buf.length);
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private int id;
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public ChatterClient(int identifier) {
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id = identifier;
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try {
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// Auto-assign port number:
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s = new DatagramSocket();
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hostAddress =
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InetAddress.getByName("localhost");
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} catch(UnknownHostException e) {
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System.err.println("Cannot find host");
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System.exit(1);
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} catch(SocketException e) {
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System.err.println("Can't open socket");
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throw new RuntimeException(e);
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}
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System.out.println("ChatterClient starting");
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}
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public void sendAndEcho(String msg) {
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try {
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// Make and send a datagram:
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s.send(Dgram.toDatagram(msg,
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hostAddress,
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ChatterServer.INPORT));
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// Block until it echoes back:
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s.receive(dp);
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// Print out the echoed contents:
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String rcvd = "Client #" + id +
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", rcvd from " +
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dp.getAddress() + ", " +
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dp.getPort() + ": " +
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Dgram.toString(dp);
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System.out.println(rcvd);
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} catch(IOException e) {
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throw new RuntimeException(e);
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}
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}
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@Override
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public void run() {
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for(int i = 0; i <= 25; i++)
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sendAndEcho("Client #" + id + ", message #" + i);
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}
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public static void main(String[] args) {
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new TimedAbort(5); // Terminate after 5 seconds
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for(int i = 0; i <= 10; i++)
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new ChatterClient(i).start();
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}
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}
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