WebSocketServlet: Send message to particular connection - html

Question

I am trying implement a Websocket connection taking an example from here - https://gist.github.com/chitan/3063774.
This is a echo server.
My question is -
How can i take a message from a particular user and send it to another user instead of echoing to the same user.
I have searched a lot and most of the examples i have found are Echo examples.

Answer 1

In Java EE7, you can do that easily. Think about an simple example. If you write client.getBasicRemote().sendObject(message); in a method with #OnMessage annotation than it will be available only active client session.
#ServerEndpoint("/websocket")
public class ChatEndpoint {
#OnMessage
public void message(String message, Session client) throws IOException, EncodeException {
client.getBasicRemote().sendObject(message);
}
}
if you loop the message on client.getOpenSessions() then it will be available to all clients:
#OnMessage
public void message(String message, Session client) throws IOException, EncodeException {
for (Session peer : client.getOpenSessions()) {
peer.getBasicRemote().sendObject(message);
}
}
For details, go to this tutorial.

Answer 2

If you still need to use Java 6 and WebSocketServlet you can do something like this:
public class WsChatServlet extends WebSocketServlet{
public StreamInbound createWebSocketInbound(String protocol){
MyMessageInbound ms = new MyMessageInbound();
// store ms somewhere and than find it and use getWsOutbound() to respond
return ms;
}
...
}