netty-websocket-spring-boot-starter Documentation

To create a WebSocket server, define a class annotated with @WsServerEndpoint. You can specify the path using the value attribute, which supports path variables (e.g., /websocket/{uid}/{arg}). Use lifecycle annotations to handle different WebSocket events.

@WsServerEndpoint(value = "/websocket/{uid}/{arg}")
public class ServerEndpoint {

    @HandshakeBefore
    public void before (HttpHeaders headers) {
        System.out.println("before");
    }

    @OnOpen
    public void open(Session session, @PathParam (value="uid") String uid, @PathParam String arg){
        System.out.println("open");
        session.sendText("hello client");
    }

    @OnMessage
    public void onMessage(Session session, String message){
        System.out.println("message:" + message);
        session.sendText("server: " + message);
    }

    @OnClose
    public void onClose(){
        System.out.println("close  " + LocalDateTime.now());
    }

    @OnError
    public void onError(Session session, Throwable e) {
        System.out.println("onError");
    }

    @OnEvent
    public void onEvent(Session session, Object evt) {
        if (evt instanceof IdleStateEvent) {
            // Handle heartbeat/idle events
        }
    }
}