Spring: send message to websocket clients

Question

I\'m building a webchat with Spring Boot, RabbitMQ and WebSocket as POC, but I\'m stucked a the last point: WebSockets
I want my ws clients to connect to a specific endpoint

Answer 1

Ok, I think I got it, for everyone who needs it, here is the answer:

first, you need to add WS dependencies to the pom.xml

    org.springframework.boot
    spring-boot-starter-websocket


    org.springframework
    spring-messaging

create a WS endpoint

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        // the endpoint for websocket connections
        registry.addEndpoint("/stomp").withSockJS();
    }

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/");

        // use the /app prefix for others
        config.setApplicationDestinationPrefixes("/app");
    }

}

Note: I'm using STOMP, so the clients should connect like this

Then, you can simply wire the ws messenger on your components with

@Autowired
private SimpMessagingTemplate webSocket;

and send the message with

webSocket.convertAndSend(channel, new String(message.getBody()));