使用Spring 4 WebSocket从Java推送消息 [英] Push message from Java with Spring 4 WebSocket

问题描述

我想将消息从Java推送到WebSocket客户端。我已成功将js客户端发送到服务器并在2个js客户端上收到消息，因此客户端代码工作正常。

I'd like to push messages from Java to WebSocket clients. I've successfully made a js client send to the server and receive a message back on 2 js clients, so the client side code works fine.

我的问题是我想要在Java应用程序中发生事件时发起发送。因此，例如，每次放置10个订单时，向所有订阅的客户端发送消息。这可能吗？

My issue is that I'd like to initiate a send when events occur within the Java app. So for example every time 10 orders have been placed send a message to all subscribed clients. Is this possible?

我当前的配置：

<websocket:message-broker application-destination-prefix="/app">
   <websocket:stomp-endpoint path="/hello">
        <websocket:sockjs/>
   </websocket:stomp-endpoint>
   <websocket:simple-broker prefix="/topic"/>
</websocket:message-broker>

@Controller
public class MessageController {
    @MessageMapping("/hello")
    @SendTo("/topic/greetings")
    public Greeting greeting() throws Exception {
       return new Greeting("Hello world");
    }
}

我希望能做的是类似这样的事情：

What I'd like to be able to do is something like this:

public class OrderManager {
    @Autowired MessageController messageController;
    int orderCount = 0;

    public void processOrder(Order o) {
        orderCount++;
        if(orderCount % 10 == 0)
            messageController.greeting();
    }
}

并且所有订阅的websocket客户端都会收到一条消息。

and all subscribed clients to the websocket receive a message.

推荐答案

您可以使用 SimpMessagingTemplate。它会自动注册。只需 autowire 就可以在任何你想要的Spring bean中使用它。

You can use the SimpMessagingTemplate. It's automatically registered. Just autowire it in any Spring bean you want.

@Autowired
private SimpMessagingTemplate template;
...
this.template.convertAndSend("/topic/greetings", text);

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