WebSocketServer.java

//
//  ========================================================================
//  Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.embedded;

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage;
import org.eclipse.jetty.websocket.api.annotations.WebSocket;
import org.eclipse.jetty.websocket.servlet.WebSocketServlet;
import org.eclipse.jetty.websocket.servlet.WebSocketServletFactory;

/**
 * Example of setting up a Jetty WebSocket server
 * <p>
 * Note: this uses the Jetty WebSocket API, not the javax.websocket API.
 */
public class WebSocketServer
{
    /**
     * Example of a Jetty API WebSocket Echo Socket
     */
    @WebSocket
    public static class EchoSocket
    {
        @OnWebSocketMessage
        public void onMessage( Session session, String message )
        {
            session.getRemote().sendStringByFuture(message);
        }
    }

    /**
     * Servlet layer
     */
    @SuppressWarnings("serial")
    public static class EchoServlet extends WebSocketServlet
    {
        @Override
        public void configure( WebSocketServletFactory factory )
        {
            // Register the echo websocket with the basic WebSocketCreator
            factory.register(EchoSocket.class);
        }
    }

    public static void main( String[] args ) throws Exception
    {
        Server server = new Server(8080);

        ServletContextHandler context = new ServletContextHandler(
                ServletContextHandler.SESSIONS);
        context.setContextPath("/");
        server.setHandler(context);

        // Add the echo socket servlet to the /echo path map
        context.addServlet(new ServletHolder(EchoServlet.class), "/echo");

        server.start();
        context.dumpStdErr();
        server.join();
    }
}