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Appendix B Example echo client

This chapter shows how to build a simple echo client reading from stdin. This example is included in the distributed package in 'src/websocket4j/examples/'.

package websocket4j.examples;


import websocket4j.client.WebSocket;

 * This file is part of GNU WebSocket4J.
 * Copyright (C) 2010  Marek Aaron Sapota
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent modules,
 * and to copy and distribute the resulting executable under terms of your choice,
 * provided that you also meet, for each linked independent module, the terms and
 * conditions of the license of that module. An independent module is a module
 * which is not derived from or based on this library. If you modify this library,
 * you may extend this exception to your version of the library, but you are not
 * obligated to do so. If you do not wish to do so, delete this exception
 * statement from your version.

 * Example presenting an echo client using WebSocket4J.
public class EchoClient {

    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(;
        WebSocket ws = new WebSocket("localhost", 5555, "/echo");
        while (true) {
            String message = in.readLine();
            System.out.println("Response: " + ws.getMessage());
            if (message.equals("exit"))