使用Websockets时无法在中获取会话

Question

我正在使用Websockets框架中的SockJS。我尝试了股票测试的例子，这是很好的工作，但现在我想在我的控制器会话，但我无法找到出路。

Client Code:
$scope.socket = new SockJS("ws/ws"); 
$scope.stompClient = Stomp.over($scope.socket); 
$scope.stompClient.connect("guest", "guest",connectCallback, errorCallback);

//in connectCallback
$scope.stompClient.subscribe('/topic/agent-sendstatus', showScreenPop);

    Java Code:
    @MessageMapping("/topic/agent-sendstatus")
        public void testmethod()
        {
            //How do i get Session here to further implement solution?

            template.convertAndSend("/topic/agent-sendstatus","bcd");
        }

Please suggest.

Answer 1

如果您引用的是WebSocket会话，那么Spring4.1允许您在传入客户端消息的头中获取会话属性，这些消息可以通过SimpMessageHeaderAccessor访问。

@MessageMapping("/topic/agent-sendstatus")
public void testmethod(SimpMessageHeaderAccessor headerAccessor) {
    String sessionId = headerAccessor.getSessionId(); // Session ID
    Map<String, Object> attrs = headerAccessor.getSessionAttributes(); // Session Attributes
    ...
}

Answer 2

我也认为你需要一个拦截器，没有它你会得到空的sessionAttributes。

您需要在HttpSessionHandshakeInterceptor中添加dispatcher-servlet.xml

<websocket:message-broker
    application-destination-prefix="/app"
    user-destination-prefix="/user">
    <websocket:stomp-endpoint path="/websocket">
        <websocket:handshake-interceptors>
            <bean class="org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor"/>
        </websocket:handshake-interceptors>
        <websocket:sockjs session-cookie-needed="true" />
    </websocket:stomp-endpoint>
    <websocket:simple-broker prefix="/topic, /message" />
</websocket:message-broker>

然后您就可以在控制器中获得会话：

@MessageMapping("/authorization.action")
public Message authorizationAction(
        SimpMessageHeaderAccessor headerAccessor, Message message) {
    Map<String, Object> sessionAttributes = headerAccessor.getSessionAttributes();
    System.out.println(sessionAttributes);
    // Do something with session
    return new Message(...);
}