如何使用Spring实现自定义WebSocket子协议

我必须在Spring引导应用程序中添加对自定义WebSocket子协议的支持(所以不是stomp),但是我很难理解我需要提供什么以及Spring已经提供了什么。

这就是我的目标:

@Configuration
@EnableWebSocket
public class WebSocketAutoConfiguration implements WebSocketConfigurer {

    public void registerWebSocketHandlers(WebSocketHandlerRegistry webSocketHandlerRegistry) {
        webSocketHandlerRegistry.addHandler(this.webSocketHandler(), new String[]{endpointUrl});
    }

    @Bean
    public WebSocketHandler webSocketHandler() {
        ExecutorSubscribableChannel clientInboundChannel = new ExecutorSubscribableChannel();
        ExecutorSubscribableChannel clientOutboundChannel = new ExecutorSubscribableChannel();
        SubProtocolWebSocketHandler subProtocolWebSocketHandler = new SubProtocolWebSocketHandler(clientInboundChannel, clientOutboundChannel);
        subProtocolWebSocketHandler.addProtocolHandler(new SubProtocolHandler() {
            public List<String> getSupportedProtocols() {
                return Collections.singletonList("custom-protocol");
            }

            public void handleMessageFromClient(WebSocketSession session, WebSocketMessage<?> message, MessageChannel outputChannel) throws Exception {
                session.sendMessage(new TextMessage("some message"));
            }

            public void handleMessageToClient(WebSocketSession session, Message<?> message) throws Exception {
            }

            public String resolveSessionId(Message<?> message) {
                return UUID.randomUUID().toString();
            }

            public void afterSessionStarted(WebSocketSession session, MessageChannel outputChannel) throws Exception {
                System.out.println("SESSION STARTED");
            }

            public void afterSessionEnded(WebSocketSession session, CloseStatus closeStatus, MessageChannel outputChannel) throws Exception {
                session.close();
                System.out.println("SESSION ENDED");
            }
        });
        return subProtocolWebSocketHandler;
    }
}

这是可行的,从这个意义上说 handleMessageFromClient 是否会触发Web套接字消息,但我无法理解 MessageChannel outputChannel 和 handleMessageToClient .

有可能得到 PerConnectionWebSocketHandler 语义与 SubProtocolWebSocketHandler ?

围绕这一点的文档基本上是不存在的,例如 手持信息客户端 说:

将给定的@link消息处理到与给定WebSocket会话关联的客户机。

好吧,太棒了。Stomp实现令人难以置信,因此它们不能很好地用作指导方针。

任何例子,宽广的步骤或任何事情,真的,都会受到赞赏。