问题
I am new to Spring boot websocket and messaging semantics. Currently i am able to send private messages using the below code.
String queueName = "/user/" + username + "/queue/wishes";
simpMessagingTemplate.convertAndSend(queueName, message);
When trying to use convertAndSendToUser I am not getting any error but the message is not getting sent. I knew that with sendToUser there should be a slight change in how the destination name should be formed but I am not getting it right.
String queueName = "/user/queue/wishes";
simpMessagingTemplate.convertAndSendToUser(username, queueName, message);
Below is my subscription code.
stompClient.subscribe('/user/queue/wishes', function(message) {
alert(message);
})
回答1:
I had a similar problem, if your username is actually a sessionId, then try to use one of the overloaded methods that accept headers (so said in SimpMessageSendingOperations javadoc):
SimpMessageHeaderAccessor headerAccessor = SimpMessageHeaderAccessor.create(SimpMessageType.MESSAGE);
headerAccessor.setSessionId(username);
headerAccessor.setLeaveMutable(true);
messagingTemplate.convertAndSendToUser(username, "/queue/wishes", message, headerAccessor.getMessageHeaders());
my example
回答2:
It is not getting sent because your "destination" i.e "queuename" is incorrect.
As you can see here SimpMessagingTemplate.java#L230 this is the method that gets invoked as a part of the chain on invocations of template.convertAndSendToUser().
This method already prefixes /user to the final destination. So instead you should do something like this:
simpMessagingTemplate.convertAndSendToUser(username,"/queue/wishes", message);
Now with the correct destination it should get sent to user.
回答3:
Finally figured out the problem. I did a silly mistake. I was filling the User DestinationPrefix as part of WebSocket config. but didn't set it up for the injected bean SimpMessaging template.
来源：https://stackoverflow.com/questions/62456213/spring-websocket-convertandsendtouser-not-working-but-convertandsend-working