如何在不使用STOMP的情况下使用原始Spring 4 WebSockets广播消息?

问题描述

在一个很好的答案中 https://stackoverflow.com/a/27161986/4358405 有一个示例使用不带STOMP子协议(也可能不带SockJS)的原始Spring4 WebSockets.

In this great answer https://stackoverflow.com/a/27161986/4358405 there is an example of how to use raw Spring4 WebSockets without STOMP subprotocol (and without SockJS potentially).

现在我的问题是:如何向所有客户广播?我期望看到一个可以与纯JSR 356 websockets API类似使用的API:session.getBasicRemote().sendText(messJson);

Now my question is: how do I broadcast to all clients? I expected to see an API that I could use in similar fashion with that of pure JSR 356 websockets API: session.getBasicRemote().sendText(messJson);

我需要自己保留所有WebSocketSession对象，然后在每个对象上调用sendMessage()吗?

Do I need to keep all WebSocketSession objects on my own and then call sendMessage() on each of them?

推荐答案

我找到了解决方案.在WebSocket处理程序中，我们管理WebSocketSession的列表，并在afterConnectionFounded函数上添加新的会话.

I found a solution. In the WebSocket handler, we manage a list of WebSocketSession and add new session on afterConnectionEstablished function.

private List<WebSocketSession> sessions = new ArrayList<>();

synchronized void addSession(WebSocketSession sess) {
    this.sessions.add(sess);
}

@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
    addSession(session);
    System.out.println("New Session: " + session.getId());
}

当我们需要广播时，只需列举列表会话中的所有会话并发送消息即可.

When we need to broadcast, just enumerate through all session in list sessions and send messages.

for (WebSocketSession sess : sessions) {
        TextMessage msg = new TextMessage("Hello from " + session.getId() + "!");
        sess.sendMessage(msg);
}

希望获得帮助！

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