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Jersey Server-Sent Events example.
There is a newer version: 2.26-b03
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
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 * recipient has the option to distribute your version of this file under
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 */
package org.glassfish.jersey.examples.sse;

import java.io.IOException;

import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;

import org.glassfish.jersey.media.sse.EventOutput;
import org.glassfish.jersey.media.sse.OutboundEvent;
import org.glassfish.jersey.media.sse.SseFeature;

/**
 * @author Pavel Bucek (pavel.bucek at oracle.com)
 */
@Path("server-sent-events")
public class ServerSentEventsResource {

    private static EventOutput eventOutput = new EventOutput();

    @GET
    @Produces(SseFeature.SERVER_SENT_EVENTS)
    public EventOutput getMessageQueue() {
        return eventOutput;
    }

    @POST
    public void addMessage(String message) throws IOException {
        eventOutput.write(new OutboundEvent.Builder().name("custom-message").data(String.class, message).build());
    }

    @DELETE
    public void close() throws IOException {
        eventOutput.close();
        eventOutput = new EventOutput();
    }

    @POST
    @Path("domains/{id}")
    @Produces(SseFeature.SERVER_SENT_EVENTS)
    public EventOutput startDomain(@PathParam("id") final String id) {
        final EventOutput seq = new EventOutput();

        new Thread() {
            public void run() {
                try {
                    seq.write(new OutboundEvent.Builder().name("domain-progress").data(String.class, "starting domain " + id + " ...").build());
                    Thread.sleep(200);
                    seq.write(new OutboundEvent.Builder().name("domain-progress").data(String.class, "50%").build());
                    Thread.sleep(200);
                    seq.write(new OutboundEvent.Builder().name("domain-progress").data(String.class, "60%").build());
                    Thread.sleep(200);
                    seq.write(new OutboundEvent.Builder().name("domain-progress").data(String.class, "70%").build());
                    Thread.sleep(200);
                    seq.write(new OutboundEvent.Builder().name("domain-progress").data(String.class, "99%").build());
                    Thread.sleep(200);
                    seq.write(new OutboundEvent.Builder().name("domain-progress").data(String.class, "done").build());
                    seq.close();

                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();

        return seq;
    }
}