Question

我希望能够检测到用户何时失去与服务器的连接（关闭标签，丢失的互联网连接等）。我在客户端上使用Sockjs上的stompjs并在我的服务器上使用spring mvc websockets。

如何检测客户端何时断开连接。这是我如何配置我的websocket消息brocket：

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfiguration extends AbstractWebSocketMessageBrokerConfigurer {
    @Autowired
    private TaskScheduler scheduler;

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic").setHeartbeatValue(new long[]{10000, 10000}).setTaskScheduler(scheduler);
        config.setApplicationDestinationPrefixes("/app");
    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/web").setAllowedOrigins("*").withSockJS();
    }
}

这是我的控制器类，它实际处理传入的套接字消息：

@RestController
@CrossOrigin
public class WebMessagingController {

    @MessageMapping("/chat/message")
    public void newUserMessage(String json) throws IOException {
        messagesProcessor.processUserMessage(json);
    }
}

我知道如果我会使用从 TextWebSocketHandler 扩展的类，我会让bean能够覆盖在连接和断开客户端时调用的方法，但我不认为这将与sock-js客户端一起使用。谢谢。

Answer 1

从class ProductController extends Controller { protected $indexManager; public function __construct(IndexManagerInterface $indexingManager) { $this->indexManager = $indexingManager; } public function displayAction(Request $request) { $em = $this->getDoctrine()->getManagerForClass(Product::class); $posts = $this->indexManager->search('query', Product::class, $em); return $this->render('ProductBundle:Default:postDisplay.html.twig', array( 'posts' => $posts)); } }调用的StompSubProtocolHandler实现afterSessionEnded()。前者发布了这样的事件：

WebSocketHandler.afterConnectionClosed()

因此，您需要的是此/** * Event raised when the session of a WebSocket client using a Simple Messaging * Protocol (e.g. STOMP) as the WebSocket sub-protocol is closed. * * <p>Note that this event may be raised more than once for a single session and * therefore event consumers should be idempotent and ignore a duplicate event. * * @author Rossen Stoyanchev * @since 4.0.3 */ @SuppressWarnings("serial") public class SessionDisconnectEvent extends AbstractSubProtocolEvent {的{{1}}，并且事件中包含所有信息。

Answer 2

除了Artem的回复，你可以在任何 spring bean 中使用@EventListener注释：

@EventListener
public void onDisconnectEvent(SessionDisconnectEvent event) {
    LOGGER.debug("Client with username {} disconnected", event.getUser());
}

如何在spring mvc中使用websocket检测客户端已断开连接

2 个答案: