Question

我按照教程here在我的Web应用程序中设置了websockets，下面是生成的代码。现在我想如果我在我的应用程序中从另一个类（LocationManagerImpl.java）写入主题，我将能够将消息发送给订阅该主题的所有客户端。但是，似乎客户似乎没有收到消息。如果我调试并检查日志，我会得到指示我的消息已写入主题，但客户端无法读取。我无法弄清楚我在这里做错了什么。请帮忙。

HelloController.java

@Controller
public class HelloController {

    @MessageMapping("/hello")
    @SendTo("/topic/greetings")
    public HelloResponse hello(HelloRequest request) throws Exception {
        Thread.sleep(3000);
        HelloResponse response = new HelloResponse();
        response.setContent(request.getContent() + " ... appending response");
        return response;
    }
}

WebSocketConfiguration.java

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfiguration extends AbstractWebSocketMessageBrokerConfigurer {

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic");
        config.setApplicationDestinationPrefixes("/app");
    }

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

hello.js

var stompClient = null;

function setConnected(connected) {
    document.getElementById('connect').disabled = connected;
    document.getElementById('disconnect').disabled = !connected;
    document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
    document.getElementById('response').innerHTML = '';
}

function connect() {
    var socket = new SockJS('/aegis/hello');
    stompClient = Stomp.over(socket);
    stompClient.connect({}, function(frame) {
        setConnected(true);
        console.log('Connected: ' + frame);
        stompClient.subscribe('/topic/greetings', function(greeting){
            showGreeting(JSON.parse(greeting.body).content);
        });
    });
}

function disconnect() {
    if (stompClient != null) {
        stompClient.disconnect();
    }
    setConnected(false);
    console.log("Disconnected");
}

function sendName() {
    var name = document.getElementById('name').value;
    stompClient.send("/app/hello", {}, JSON.stringify({ 'content': name }));
}

function showGreeting(message) {
    var response = document.getElementById('response');
    var p = document.createElement('p');
    p.style.wordWrap = 'break-word';
    p.appendChild(document.createTextNode(message));
    response.appendChild(p);
}

sample.jsp

<%@ include file="/common/taglibs.jsp"%>

<head>
    <title><fmt:message key="sample.title"/></title>
    <meta name="menu" content="SampleMenu"/>
    <script src="//code.jquery.com/jquery-2.1.3.min.js"></script>
    <script src="//cdn.jsdelivr.net/sockjs/0.3.4/sockjs.min.js"></script>
    <script src="scripts/stomp.js"></script>
    <script src="scripts/hello.js"></script>
    <script>
        $(document).ready(function(){
            disconnect();
        });
    </script>
</head>

<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websocket relies on Javascript being enabled. Please enable
    Javascript and reload this page!</h2></noscript>
<div>
    <div>
        <button id="connect" onclick="connect();">Connect</button>
        <button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>
    </div>
    <div id="conversationDiv">
        <label>What is your name?</label><input type="text" id="name" />
        <button id="sendName" onclick="sendName();">Send</button>
        <p id="response"></p>
    </div>
</div>

LocationManagerImpl.java

@Service("locationManager")
public class LocationManagerImpl extends GenericManagerImpl<TripTrack,Long> implements LocationManager {

    @Autowired
    private SimpMessageSendingOperations messagingTemplate;

        @Override
        public Response locations(JsonRequest loc) {

            //... some code here     

            // Send to UI
            messagingTemplate.convertAndSend("/topic/greetings", "{\"content\": \"hello\"}");

            //... some more code here
        }
}

无法从其他服务向websocket发送消息

0 个答案: