webstomp-client：未调用connect回调

Question

我从Springboot开始使用Websocket。因此对于客户端，我正在使用webstomp-client library.。

要连接到websocket服务器，该库提供了connect方法，该方法还接受成功回调函数。我面临的问题是未调用回调函数。

成功建立连接后，我需要订阅队列，因此调用成功回调对于调用订阅很重要。

//controller.js
//Main Controller
clentModule.controller('clentController', function($scope) {
    var client;
    $scope.connectAndSubscribe = function()
    {
        var url = "ws://localhost:8080/gs-guide-websocket/websocket";
        client = webstomp.client(url);
        connected = function()
        {
            console.log("connected");
        }

        var headers = {};
        client.connect(headers,function(){
            console.log("successfuly connected");
            var subscription = client.subscribe("/topic/greetings",subscriptionCallback);
        });

        subscriptionCallback = function(data) {
            console.log("subscription data", data);
        }

        //var subscription = client.subscribe("/topic/greetings",subscriptionCallback);
        //console.log(subscription);
    };

    $scope.sendMessage = function()
    {
        $scope.message = {};
        $scope.message.sender = "xyz";
        $scope.message.reciever = "abc";
        var sendObject = JSON.stringify($scope.message);
        client.send("/topic/greetings", {priority: 9}, sendObject);
    };

});

//Webscocketconfig.java
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer
{
   @Override
   public void configureMessageBroker( MessageBrokerRegistry config )
   {
      config.enableSimpleBroker( "/topic" );
      config.setApplicationDestinationPrefixes( "/app" );
   }

   @Override
   public void registerStompEndpoints( StompEndpointRegistry registry )
   {
      registry.addEndpoint( "/gs-guide-websocket" ).setAllowedOrigins( "*" ).withSockJS();
   }
}