Spring 引導的 convertAndSendToUser 不工作

Question

我是 Spring 引導的新手並試圖學習它。 我正在學習如何制作一個簡單的一對一聊天應用程序的教程。

除了沒有在用戶之間發送消息外，一切正常。 消息從發送者發送到服務器，但是當convertAndSentToUser()沒有任何東西到達其他客戶端（接收者）。

這是消息代理配置：

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketMessageBrokerConfig implements WebSocketMessageBrokerConfigurer {
    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/user");
        config.enableSimpleBroker("/topic", "/queue");
        config.setApplicationDestinationPrefixes("/app");
        config.setUserDestinationPrefix("/user");
    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/broadcast");
        registry.addEndpoint("/broadcast").withSockJS().setHeartbeatTime(60_000);
        registry.addEndpoint("/chat").withSockJS();
    }

    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new UserInterceptor());
    }
}

以及處理新連接的 controller：

@RestController
@Log4j2
public class WebSocketConnectionRestController {
    
    @Autowired
    private ActiveUserManager activeSessionManager;
    
    ...

    @PostMapping("/rest/user-connect")
    public String userConnect(HttpServletRequest request, @ModelAttribute("username") String userName) {
        String remoteAddr = "";
        if (request != null) {
            remoteAddr = request.getHeader("Remote_Addr");
            if (remoteAddr == null || remoteAddr.isEmpty()) {
                remoteAddr = request.getHeader("X-FORWARDED-FOR");
                if (remoteAddr == null || "".equals(remoteAddr)) {
                    remoteAddr = request.getRemoteAddr();
                }
            }
        }

        log.info("registered " + userName + " " + remoteAddr);
        activeSessionManager.add(userName, remoteAddr);
        return remoteAddr;
    }


   ...

}

最后，這是處理新消息的 controller：

@Controller
@Log4j2
public class WebSocketChatController implements ActiveUserChangeListener {
    @Autowired
    private SimpMessagingTemplate webSocket;

    ...
    
    @MessageMapping("/chat")
    public void send(@Payload ChatMessage chatMessage) throws Exception {
        ChatMessage message = new ChatMessage(chatMessage.getFrom(), chatMessage.getText(), chatMessage.getRecipient());
        log.info("sent message to " + chatMessage.getRecipient());
        webSocket.convertAndSendToUser(chatMessage.getRecipient(), "/queue/messages", message);
    }

    ...

}

Answer 1

我終於找到了問題所在。 本教程有一個UserInterceptor ，它將 session id 鏈接到用戶名的新連接，但它試圖將 Arraylist 轉換為 LinkedList 所以我只是將它轉換為 List ：

public class UserInterceptor implements ChannelInterceptor {
    
    @Override
    public Message<?> preSend(Message<?> message, MessageChannel channel) {
        StompHeaderAccessor accessor
                = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);

        if (StompCommand.CONNECT.equals(accessor.getCommand())) {

            Object raw = message
                    .getHeaders()
                    .get(SimpMessageHeaderAccessor.NATIVE_HEADERS);

            if (raw instanceof Map) {
                Object name = ((Map) raw).get("username");
                if (name instanceof List) {
                    accessor.setUser(new User(((List) name).get(0).toString()));
                }
            }
        }

        return message;
    }
}