Spring Websocket践踏客户端如何捕获丢失的连接？

Question

我使用spring websocket踩踏客户端。以下是代码片段？

List<Transport> transports = new ArrayList<Transport>(2);
transports.add(new WebSocketTransport(new StandardWebSocketClient()));
transports.add(new RestTemplateXhrTransport());

WebSocketHttpHeaders headers = new WebSocketHttpHeaders();
headers.add("Cookie", client.getCookieString());

SockJsClient sockJsClient = new SockJsClient(transports);

WebSocketStompClient stompClient = new WebSocketStompClient(sockJsClient);
stompClient.setMessageConverter(new StringMessageConverter());
ListenableFuture<StompSession> future = 
   stompClient.connect(configuration.getApp().getWebsocketServerBase() + "/websocket/sa", headers, new MyWebSocketHandler());

future.addCallback(new SuccessCallback<StompSession>() {
    public void onSuccess(StompSession stompSession) {
        System.out.println("on Success!");
    }
}, new FailureCallback() {
    public void onFailure(Throwable throwable) {
        System.out.println("on Failure!");
    }
});

它可以工作，但是当websocket服务器关闭时，客户端不会收到该消息。

如何监听服务器关闭事件？

Answer 1

我找到了解决方案。

MyWebSocketHandler这样实现StompSessionHandler：

private class MyWebSocketHandler implements StompSessionHandler {
    @Override
    public void afterConnected(StompSession stompSession, StompHeaders stompHeaders) {

    }

    @Override
    public void handleException(StompSession stompSession, StompCommand stompCommand, StompHeaders stompHeaders, byte[] bytes, Throwable throwable) {
    }

    @Override
    public void handleTransportError(StompSession stompSession, Throwable throwable) {
        if (throwable instanceof ConnectionLostException) {
            // if connection lost, call this
        }
    }

    @Override
    public Type getPayloadType(StompHeaders stompHeaders) {
        return null;
    }

    @Override
    public void handleFrame(StompHeaders stompHeaders, Object o) {
    }
}

您可以看到方法handleTransportError。谢谢。

参考Spring WebSocket文档 25.4.13 STOMP客户端。