Implementing WebSocket on Spring MVC based Server - spring-mvc

Question

I searched a lot about implementing WebSocket/XMPP on Spring MVC based server but couldn't reach to a concrete answer. So here is my requirement
Receive a message from a client (in my case it will be a android/iOS mobile) via WebSocket/XMPP on tomcat server and parse the actual message at server side
Send a message from server app to WebSocket/XMPP client
If somebody could help me to point on some good tutorial or demo code, it would be a great help.

Answer 1

run Tomee 1.5.2
http://openejb.apache.org/downloads.html
activate the ActiveMQ JMS Server. create an OpenEJB configuration.
http://www.mail-archive.com/users#openejb.apache.org/msg04327.html
setup an XMPP ActiveMQ server protocol listener (in the activemq.xml)
in your Spring services configuration, create a Spring JMS listener (Spring ListenerContainer) configuration on the Topic/Queue.
you can use the JmsTemplate to push a message out to the Queue/Topic via ActiveMQ, the XMPP client will receive the message.
Enjoy!
BTW: This is exactly what I am in the middle of setting up right now...still learning.

Answer 2

check this out: www.xchat.io. It was built based on Asynchronous Spring MVC (DefferredResult, you know), XMPP, and jQuery. it's promising.

Answer 3

I am not sure if this is just perfect way to achieve or not, but for now I have found a solution and it would be glad to share it here.
There are two steps that you have to done.
1. Instead of ordinary HTTPServlet sub class, create a sub class of WebSocketServlet and
2. Create a sub class of MessageInbound class and override its required methods.
P.S. : Only latest version of tomcat supports WebSocket (apache tomcat 7.0.42 or higher).
Here is a WebSocket class.
public class WsChatServlet extends WebSocketServlet {
private static final long serialVersionUID = 1456546233L;
#Override
protected StreamInbound createWebSocketInbound(String protocol,
HttpServletRequest request) {
return new IncomingMessageHandler();
}
}
And this is a simple class which can send/receive message (String/binary).
public class IncomingMessageHandler extends MessageInbound {
#Override
public void onOpen(WsOutbound outbound) {
logger.info("Open Client.");
}
#Override
public void onClose(int status) {
logger.info("Close Client.");
}
#Override
public void onTextMessage(CharBuffer cb) throws IOException {
logger.info("Text Message received:" + cb.toString());
}
#Override
public void onBinaryMessage(ByteBuffer bb) throws IOException {
}
public synchronized void sendTextMessage(String message) {
try {
CharBuffer buffer = CharBuffer.wrap(message);
this.getMyoutbound().writeTextMessage(buffer);
this.getMyoutbound().flush();
} catch (IOException e) {
// Handle Exception
}
}
}