java - 无法连接通过sparkjava创建的websocket url

Question

我正在尝试使用 sparkjava 创建一个 websocket框架。下面是创建 websocket 的代码

public final class MainWS {
static Map<Session, String> USER_SESSION_MAP = new ConcurrentHashMap<>();
static int nextUserNumber = 1;
public static void main(String[] args) {
    port(8090);
    webSocket("/echo", ChatWebSocketHandler.class);
    init();
}
public static void broadcastMessage(String sender, String message) {
    USER_SESSION_MAP.keySet().stream().filter(Session::isOpen).forEach(session -> {
        try {
            session.getRemote().sendString(String.valueOf(new JSONObject().put("userMessage", "message to pass")
                    .put("userlist", USER_SESSION_MAP.values())));
        } catch (Exception e) {
            e.printStackTrace();
        }
    });
}

}

现在CharWebSocketHandler代码如下:

    @WebSocket
public final class ChatWebSocketHandler {

    private String sender, msg;

    @OnWebSocketConnect
    private void onConnect(Session user) throws Exception {
        String username = "User" + MainWS.nextUserNumber++;
        MainWS.USER_SESSION_MAP.put(user, username);
        MainWS.broadcastMessage(sender = "Server", msg = (username + " joined the Main"));
    }

    @OnWebSocketClose
    private void onClose(Session user, int statusCode, String reason) {
        String username = MainWS.USER_SESSION_MAP.get(user);
        MainWS.USER_SESSION_MAP.remove(user);
        MainWS.broadcastMessage(sender = "Server", msg = (username + " left the Main"));
    }

    @OnWebSocketMessage
    private void onMessage(Session user, String message) {
        MainWS.broadcastMessage(sender = MainWS.USER_SESSION_MAP.get(user), msg = message);
    }
}

运行我的 MainWS 程序后，我使用 rxjs 通过 Angular 获取 websocket 连接

代码如下:

export class WebsocketService {
  socket: WebSocketSubject<WSMessageService>
  constructor() {
    this.socket = new WebSocketSubject("ws://localhost:8090/echo");
    this.socket.subscribe(
      msg => {
        console.log(msg)
      },
      err => {
        console.log(err)
      },
      () => {
        console.log('complete')
      }
    );
  }
  public sendMessage(message: WSMessageService): void {
    this.socket.next(message)
  }
}

现在，当我尝试运行我的代码时，我收到如下错误:

Firefox 无法与位于 ws://localhost:8090/echo 的服务器建立连接错误 { target: WebSocket, isTrusted: true, srcElement: WebSocket, currentTarget: WebSocket, eventPhase: 2, bubbles: false, cancelable: false, returnValue: true, defaultPrevented: false,composed: false, … }

完全不确定我到底哪里做错了。如果有人有任何想法请告诉我。

Answer 1

问题是我在 ChatWebSocketHandler 类中创建了所有私有(private)方法。创建所有公共(public)方法后，我可以连接并获取 websocket 对象。