Spring session + Spring web socket. Send message to specific client based on session id

问题

I have followed Quetion1 and Quetion2 from stack overflow to send messages to specific client, based on its sessionId but could not find success.

Below is my sample RestController class

@RestController
public class SpringSessionTestApi {

@Autowired
public SimpMessageSendingOperations messagingTemplate;

@MessageMapping("/messages")
public void greeting(HelloMessage message, SimpMessageHeaderAccessor headerAccessor) throws Exception {

    String sessionId  = (String) headerAccessor.getSessionAttributes().get("SPRING.SESSION.ID");
    messagingTemplate.convertAndSendToUser(sessionId,"/queue/test",message, createHeaders(sessionId));

   }

private MessageHeaders createHeaders(String sessionId) {
    SimpMessageHeaderAccessor headerAccessor = SimpMessageHeaderAccessor.create(SimpMessageType.MESSAGE);
    headerAccessor.setSessionId(sessionId);
    headerAccessor.setLeaveMutable(true);
    return headerAccessor.getMessageHeaders();
   }
}

Session Id: when client sends createSession request, new spring sessionId is generated and same is stored in MongoDB as well. After that when client sends web socket connect request, same sessionId is received which was stored in mongoDb as expected. Till This everything is working fine.

Now my job is to send response back to the client based on the sessionId. For that I have below web socket class:

@Configuration
@EnableScheduling
@EnableWebSocketMessageBroker
public class WebSocketConfig extends
    AbstractSessionWebSocketMessageBrokerConfigurer<ExpiringSession> {

@Override
protected void configureStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/messages");
}

public void configureMessageBroker(MessageBrokerRegistry registry) {
    registry.enableSimpleBroker("/queue");
    registry.setApplicationDestinationPrefixes("/app");
   }
}

and the sample client code that I am using to connect is:

function connect() {

stompClient = Stomp.client('ws://localhost:8016/messages');
stompClient.debug = null;

stompClient.connect({}, function (frame) {
    setConnected(true);
    console.log('Connected: ' + frame);
    stompClient.subscribe('/user/queue/test', function (greeting) {
        console.log("Hello "+greeting);
        console.log("Greeting body "+JSON.parse(greeting.body));

    });
});
}

Please help, Where I am doing wrong in this? Thanks in Advance!

回答1:

If you are using /user channel as you do, try to pass the user as stated here.

@MessageMapping("/messages")
public void greeting(HelloMessage message, SimpMessageHeaderAccessor headerAccessor, Principal principal) 
    throws Exception {
    messagingTemplate.convertAndSendToUser(principal.getName(), "/queue/test", message);
}

回答2:

I've found a full workable Spring Stomp Chat project in git, the link is here. You can refer to it. https://gist.github.com/theotherian/9906304

来源：https://stackoverflow.com/questions/43536507/spring-session-spring-web-socket-send-message-to-specific-client-based-on-ses

标签

java

Spring

stomp

spring-websocket

spring-session