在每次http请求时向客户端发送stomp消息

Question

我有一个Spring Boot服务器和一个客户端，它们使用STOMP通过Websockets连接。

我的用例是，每次向特定endpoint发出http请求时，我都想向客户机发送数据。我找到的所有教程，只展示了这种情况，客户端向“/hello”发送一些数据，服务器通过向“topic/greetings”发送数据做出反应:

@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Greeting greeting(HelloMessage message) throws Exception {
    Thread.sleep(1000); // simulated delay
    return new Greeting("Hello, " + HtmlUtils.htmlEscape(message.getName()) + "!");
}

我需要的是一个控制器方法，它无需消息映射即可发送数据。它应该只是在每次有人对endpoint执行 get 请求时将数据发送到客户端。我尝试了以下方法，但不起作用：

@Autowired
private SimpMessagingTemplate msgTemplate;

@SendTo("topic/data-received")
@RequestMapping(value = "/send-data", method = RequestMethod.POST)
public String sendData(@RequestHeader(value = "id") String id,
                               @RequestHeader(value = "data") String data) {

    User user = new User();
    user.id = UUID.fromString(id);
    user.stringData = data;
    database.saveStringData(user);
    msgTemplate.convertAndSend("topic/data-received", "data sent!!");
    return "successful";
}

这是我的客户代码:

function connect() {
var socket = new SockJS('/clipboard-websocket');
var stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
    console.log('Connected: ' + frame);
    stompClient.subscribe('topic/data-received/', function (message) {
        alert("Data received!!");
    });
}

这是我的WebSocket配置：

@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
    config.enableSimpleBroker("/topic");
    config.setApplicationDestinationPrefixes("/app");
}

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/clipboard-websocket").withSockJS();
}

Answer 1

目标中缺少尾随斜线

msgTemplate.convertAndSend("/topic/data-received", "data sent!!");

github-repo-issue-54498776