spring websocket 客户端没有检测到网络连接丢失

Question

Spring @ClientEndpoint websocket 客户端未检测到因电缆拔出而导致的网络断开。我还实现了 ping/pong 机制。有人可以帮我解决发生的事情吗？但是，我在重新连接电缆后看到以下异常，仅供参考，所有设置均为默认设置。此外，我正在连接到没有任何控制权的第 3 方远程端点。

xxxxxException: closed with code : CLOSED_ABNORMALLY reason: CloseReason: code [1006], reason [java.io.IOException: Connection reset by peer]
    at xxxxxx.onClose(WSClient.java:xx)


@ClientEndpoint
public class WSClient {
    private Session session;
    private int i = 0;

    @OnOpen
    public void open(Session session) {
        System.out.println("Connected to the server");
        this.session = session;
    }

    @OnClose
    public void close(Session session, CloseReason closeReason) {
        System.out.println("connection closed " + closeReason.getReasonPhrase());
    }

    @OnError
    public void error(Session session, Throwable t) {
        System.out.println(session.getId());
        System.out.println("Error in connection " + t.getMessage());
    }

    @OnMessage
    public void message(Session session, String message) {
        System.out.println("message received: " + message + " " + i++);
    }

    public void send(String message){
        try {
            if(session.isOpen()) {
                this.session.getBasicRemote().sendPing(ByteBuffer.wrap(message.getBytes()));
                System.out.println("socket is open " + i++);
            } else {
                System.out.println("socket closed");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}


@Component
public class ClientApp implements ApplicationListener<ApplicationReadyEvent> {

    private void startConnection() throws Exception {
        WebSocketContainer container = ContainerProvider.getWebSocketContainer();
        WSClient client = new WSClient();
        container.connectToServer(client, new URI("ws://wshost:8080/ping"));

        while (true) {
            client.send("ping");
            TimeUnit.SECONDS.sleep(3);
        }
    }

    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        try {
            startConnection();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

Answer 1

可以通过将以下代码添加到 WSClient.

来解决此问题

@OnMessage
public void pongMessage(Session session, PongMessage msg) {
    LOGGER.debug("Pong message received: " + Instant.now());
    //schedule a timeout task, and raise an event or so if timed out.
}

当远程端点发送 pong 消息作为对发送的 ping 消息的响应时，将调用上述代码段。基本上会有两种用 @OnMessage 注释的方法，一种是接收用户消息有效负载，另一种是框架发送的 pong 消息有效负载。

spring websocket 客户端没有检测到网络连接丢失

spring websocket client does not detect network connection loss

spring

spring-boot

spring-websocket

java-websocket