how to capture connection event in my webSocket server with Spring 4?

Question

I did a simple web socket communication with spring 4,STOMP and sock.js, following this https://github.com/rstoyanchev/spring-websocket-portfolio and this http://assets.spri

Answer 1

Spring WebSocket publishes events when messages are received from the client, if you are using STOMP, these are the events published:

• SessionConnectedEvent
• SessionConnectEvent
• SessionDisconnectEvent
• SessionSubscribeEvent
• SessionUnsubscribeEvent

The easiest way to detect connects and disconnects is by implementing an event listener for the mentioned events.

public class WebSocketEventListener {

    @EventListener
    private void handleSessionConnected(SessionConnectEvent event) {
        ...
    }

    @EventListener
    private void handleSessionDisconnect(SessionDisconnectEvent event) {
        ...
    }
}

Here's a sample implementation that keeps track of connected users: https://github.com/salmar/spring-websocket-chat/blob/master/src/main/java/com/sergialmar/wschat/event/PresenceEventListener.java