我希望能够检测到用户何时失去了与服务器的连接(关闭的选项卡、丢失的互联网连接等)我在客户端使用stompjs而不是Sockjs,在服务器上使用spring mvc websockets。
如何检测客户端何时断开连接。下面是我如何配置我的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,如果我使用从TextWebSocketHandler扩展的类,我将能够重写在客户端连接和断开时调用的方法,但我认为这不适用于sock-js客户端。谢谢。
发布于 2018-03-20 00:07:31
StompSubProtocolHandler
实现了从WebSocketHandler.afterConnectionClosed()
调用的afterSessionEnded()
。而前者发出的事件如下所示:
/**
* 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 {
因此,您需要的是此SessionDisconnectEvent
的ApplicationListener
,并且所有信息都在事件中。
发布于 2018-03-28 19:15:44
除了Artem的响应之外,您还可以在任何spring bean中使用@EventListener注释
@EventListener
public void onDisconnectEvent(SessionDisconnectEvent event) {
LOGGER.debug("Client with username {} disconnected", event.getUser());
}
https://stackoverflow.com/questions/49367317
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