WebSocketStompClient 不会连接到 SockJS 端点

java spring spring-websocket

2022-09-03 17:58:31

我正在使用新的（从4.2版开始）java STOMP客户端支持。我的起点是入门指南（使用WebSocket构建交互式Web应用程序）。

示例中提供了以下终结点：

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/hello").withSockJS();
}

我可以使用浏览器客户端成功连接。尝试使用以下方法使用 java 踩踏客户端连接到此端点时：

WebSocketClient transport = new StandardWebSocketClient();
WebSocketStompClient stompClient = new WebSocketStompClient(transport);
stompClient.setMessageConverter(new StringMessageConverter());
String url = "ws://127.0.0.1:8080/hello";       
ListenableFuture<StompSession> future = stompClient.connect(url,myHandler);

我遇到以下异常：

08:56:30.629 [SimpleAsyncTaskExecutor-1] DEBUG o.s.m.simp.stomp.DefaultStompSession - Failed to connect session id=4e6737da-8f68-691d-375f-9e46f48bc149
javax.websocket.DeploymentException: The HTTP response from the server [HTTP/1.1 200 OK
] did not permit the HTTP upgrade to WebSocket
    at org.apache.tomcat.websocket.WsWebSocketContainer.parseStatus(WsWebSocketContainer.java:637) ~[tomcat-embed-websocket-8.0.20.jar:8.0.20]
    at org.apache.tomcat.websocket.WsWebSocketContainer.processResponse(WsWebSocketContainer.java:621) ~[tomcat-embed-websocket-8.0.20.jar:8.0.20]
    at org.apache.tomcat.websocket.WsWebSocketContainer.connectToServer(WsWebSocketContainer.java:309) ~[tomcat-embed-websocket-8.0.20.jar:8.0.20]
    at org.springframework.web.socket.client.standard.StandardWebSocketClient$1.call(StandardWebSocketClient.java:152) ~[spring-websocket-4.2.0.BUILD-SNAPSHOT.jar:4.2.0.BUILD-SNAPSHOT]
    at org.springframework.web.socket.client.standard.StandardWebSocketClient$1.call(StandardWebSocketClient.java:149) ~[spring-websocket-4.2.0.BUILD-SNAPSHOT.jar:4.2.0.BUILD-SNAPSHOT]
    at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0]

经过进一步调查，我更改了基于TomcatWebSocketTestServer的服务器端点配置.java在StompWebSocketIntegrationTests中使用.java如下所示：

RequestUpgradeStrategy upgradeStrategy = new TomcatRequestUpgradeStrategy();
registry.addEndpoint("/hello")
    .setHandshakeHandler(new DefaultHandshakeHandler(upgradeStrategy))
    .setAllowedOrigins("*");

我现在可以连接，但浏览器客户端无法连接。

GET http://localhost:8080/hello/info 404 (Not Found)

如果我将 .withSockJs（）添加到终结点配置中：

RequestUpgradeStrategy upgradeStrategy = new TomcatRequestUpgradeStrategy();
registry.addEndpoint("/hello")
    .setHandshakeHandler(new DefaultHandshakeHandler(upgradeStrategy))
    .setAllowedOrigins("*")
    .withSockJs();

浏览器客户端可以再次连接，但 java 客户端返回到原始错误。

在这种情况下，我应该能够在两个客户端之间共享同一个终结点，还是需要配置两个单独的终结点？

答案 1

以下配置有效：

RequestUpgradeStrategy upgradeStrategy = new TomcatRequestUpgradeStrategy();
registry.addEndpoint("/hello")
        .withSockJS();

registry.addEndpoint("/hello")
        .setHandshakeHandler(new DefaultHandshakeHandler(upgradeStrategy))
        .setAllowedOrigins("*");

不确定这是否是设计使然（即具有相同路径的两个端点）？

基于Brian-Clozel反馈的更好的解决方案是在配置WebSocketStompClient时使用java SockJsClient作为传输：

List<Transport> transports = new ArrayList<>(1);
transports.add(new WebSocketTransport( new StandardWebSocketClient()) );
WebSocketClient transport = new SockJsClient(transports);
WebSocketStompClient stompClient = new WebSocketStompClient(transport);

它只允许使用一个端点，Java和javascript客户端都可以连接到该端点：

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/hello").withSockJS();
}

答案 2

如参考文档中所述：启用 SockJS 时，将为您配置多个传输。首先，客户端发送一个请求以了解支持的传输，然后根据其功能发送一个请求："GET /info"

"http://host:port/myApp/myEndpoint/{server-id}/{session-id}/{transport}"

现在，您无需为终端节点复制配置。您宁愿直接使用websocket端点，或者更好的是将Java SockJS客户端与websocket传输一起使用。请参阅参考文档中的完整示例。"/hello"