Is there a way to use WebSockets with SockJS client and Spring 4 server but not using STOMP?
Based on this tutorial from Spring's website, I know how to set up a WebSocket based application using Stomp and Spring 4. On the client side, we have:
var socket = new SockJS('/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);
});
});
And on the server side, we have the following in the controller:
#MessageMapping("/hello")
#SendTo("/topic/greetings")
public Greeting greeting(HelloMessage message) throws Exception {
Thread.sleep(3000); // simulated delay
return new Greeting("Hello, " + message.getName() + "!");
}
Now, I understand that #MessageMapping("/hello") ensures that if a message is sent to a destination "/hello", then the greeting() method will be called. And since the stompClient is subscribed to "/topic/greetings", the #SendTo("/topic/greetings") will send the message back to the stompClient.
But the problem with the above is that stompClient is a Stomp object. And I want to simply use sock.send('test'); and have it delivered to my server's destination. And I want to do #SendTo("myownclientdestinationmap"), I can receive it by
sock.onmessage = function(e) {
console.log('message', e.data);
};
So, any way to do this with Spring 4, SockJS and without Stomp? Or does Spring 4 WebSocket only supports Stomp?
Spring supports STOMP over WebSocket but the use of a subprotocol is not mandatory, you can deal with the raw websocket. When using a raw websocket, the message sent lacks of information to make Spring route it to a specific message handler method (we don't have any messaging protocol), so instead of annotating your controller, you'll have to implement a WebSocketHandler:
public class GreetingHandler extends TextWebSocketHandler {
#Override
public void handleTextMessage(WebSocketSession session, TextMessage message) {
Thread.sleep(3000); // simulated delay
TextMessage msg = new TextMessage("Hello, " + message.getPayload() + "!");
session.sendMessage(msg);
}
}
And then add your handler to the registry in the configuration (you can add more than one handler and use SockJS for fallback options):
#Configuration
#EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {
#Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(greetingHandler(), "/greeting").withSockJS();
}
#Bean
public WebSocketHandler greetingHandler() {
return new GreetingHandler();
}
}
The client side will be something like this:
var sock = new SockJS('http://localhost:8080/greeting');
sock.onmessage = function(e) {
console.log('message', e.data);
}
Related
I want to initiate a trigger(maybe a notification) from backend(based in spring boot) to a particular user whose userId is xyz.
the one way i have found is:
initially i connect to a websocket end point and subscribe to channel "/user/Notifications/xyz"
following is the relevant code in my angular typescript
connectToUserWebSocket(userId) {
let socket = new SockJS('http://localhost:5000/fellowGenius');
this.ws = Stomp.over(socket);
let that = this;
this.ws.connect(
{},
(frame) => {
that.ws.subscribe('/user/Notifications/' +userId, (message) => {
console.log("user subscribed");
});
},
(error) => {
alert('STOMP error ' + error);
}
);
}
Now once i have subscribed to my channel . I want to send a trigger to client which is initiated by backend itself so i run a code in my java service.
My relevant java code is:
#SendTo("/user/Notifications/{userId}")
public String sendMeetingNotificationWebSocket(#DestinationVariable String userId) {
return "hello";
}
my websocket configurations are:
#Configuration
#EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer{
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/fellowGenius").setAllowedOrigins("*").addInterceptors(new HttpSessionHandshakeInterceptor()).withSockJS();
}
#Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/inbox/","/user/Notifications/");
}
}
But the problem is that even i can see one web socket connected in my spring boot console.
But i don't get a response from the function on the client side.
Please help me with this problem.
I am currently developing a Web Socket for internal and external requests. However, while trying to test the bidirectional connection via a Chrome command I received the following error:
"Origin 'null' is therefore not allowed access."
Web Socket configuration:
#Configuration
#EnableWebSocketMessageBroker
public class SocketConfig implements WebSocketMessageBrokerConfigurer{
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/bidirectional");
}
public void registerStompEndpoints(StompEndpointRegistry registry) {
//register a new endpoint
registry.addEndpoint("/blueframe").setAllowedOrigins("/*");
registry.addEndpoint("/blueframe").setAllowedOrigins("/*").withSockJS();
}
}
JavaScript connection:
var socket = new SockJS('http://192.168.137.23:8080/blueframe');
stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
setConnected(true);
console.log('Connected: ' + frame);
});
I already tried to see other posts with no results.
First i quitted using Webservices, instead i start using RabbitMQ for a bidirectional communication.
Regarding Web Socket Configuration, i am not the only one having this problem so i found a parcial solution: Downgrade the Spring version or use Socket handlers instead of StompEndpointRegistry interface.
Scenario:
Client(angular js 1.4) will call Rest endpoint to get data, the server(spring boot) will process the list of files and will return accurate data. To process the list of files, the server will take time depending on the number of files. so I have implements STOMP notification as to send a notification to the client saying "List of files have been processed and here is the bunch of files(result)".
Issue:
Stomp connection is established successfully and client also gets subscribed, but when the server publishes the events, client is not able to receive.
Below is my code snippet:
WebSocketConfig.java
#Configuration
#EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/ws").withSockJS();
}
#Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.setApplicationDestinationPrefixes("/app");
registry.enableSimpleBroker("/topic"); // Enables a simple in-memory broker
}
}
SocketController.java
#Controller
public class SocketController {
#SendTo("/topic/public")
public String sendMessage() {
LOGGER.info("====> chatMessage()");
return "List updated successfully";
}
}
main.js
connect() {
var socket = new SockJS('/ws');
var stompClient = Stomp.over(socket);
event.preventDefault();
console.log("socket: ", socket);
console.log("stompClient: ", stompClient);
stompClient.connect({}, function (frame) {
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/public', function (payload) {
console.log("payload: ", payload);
var message = JSON.parse(payload.body);
console.log("message: ", message);
});
}, function (error) {
console.log("onError() called");
console.log("error: ",error);
});
};
Scripts used:
<script src="https://cdnjs.cloudflare.com/ajax/libs/sockjs-client/1.1.4/sockjs.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/stomp.js/2.3.3/stomp.min.js"></script>
connect() method of main.js is called on button click. Probably there is an issue regarding scope I guess.
Use SimpMessagingTemplate to convert and send messages to the specific topic.
#Controller
public class SocketController {
private static final Logger LOGGER = LoggerFactory.getLogger(SocketController.class);
#Autowired private SimpMessagingTemplate template;
public void sendMessage(String message) {
LOGGER.info("====> sendMessage:");
this.template.convertAndSend("/topic/public", message);
}
}
I have this websocket server developed using Spring Boot. The server is working fine with a js based client.
#Configuration
#EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
#Override
public void configureMessageBroker(final MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}
#Override
public void registerStompEndpoints(final StompEndpointRegistry registry) {
registry.addEndpoint("/chat").withSockJS();
registry.addEndpoint("/chat");
}
}
The controller:
#Controller
public class ChatController {
#MessageMapping("/chat")
#SendTo("/topic/messages")
public OutputMessage send(final Message message) throws Exception {
final String time = new SimpleDateFormat("HH:mm").format(new Date());
return new OutputMessage(message.getFrom(), message.getText(), time);
}
}
This is the server side. Now, for the client, I have created a #ClientEndpoint and when I connect to the URI "ws://localhost:8080/spring-mvc-java/chat", I am able to establish a connection and I can see that the #OnOpen callback of #ClientEndpoint is triggered.
However, it seems that the userSession.getAsyncRemote().sendText(message) does not have any effect. I don't see the response from the server.
I can see the js client is:
Connecting to the server var socket = new SockJS('/spring-mvc-java/chat')
Subscribing stompClient.subscribe('/topic/messages',...
Send the message stompClient.send("/app/chat",...
I am able to achieve the first step. How to achieve the 2nd and the 3rd step in a Java based client?
Thanks
First of all you need a websocketclient and websocketstompclient
WebSocketClient client = new StandardWebSocketClient();
WebSocketStompClient stompClient = new WebSocketStompClient(client);
stompClient.setMessageConverter(new MappingJackson2MessageConverter());
You have to custom handler from StompSessionHandler for
getPayloadType
handleFrame
afterConnected
handleException
handleTransportError
methods
StompSessionHandler sessionHandler = new CustomStompSessionHandler();
You can connect your sockets like this. You can accomplish sending and receiving messages
StompSession stompSession=stompClient.connect("ws://localhost:8080/chat",sessionHandler).get();
This two trigger your websocket topic/messages give you messages through the sockets
/app/chat sending Message to sockets
stompSession.subscribe("/topic/messages", sessionHandler);
stompSession.send("/app/chat", new Message("Hi", "user"));
do you want like this?
I have an JMS listener, and I have to take the message, manipulate it and then redirect it to an page using websocket.
Well, I’m just confused about the configuration, I have configured the WebSocketConfig:
#Configuration
#EnableWebSocketMessageBroker
#EnableScheduling
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
#Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic", "/queue");
config.setApplicationDestinationPrefixes("/app");
}
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/ws/firstep/").withSockJS();
registry.addEndpoint("/ws/secondep/").withSockJS();
}
And this it should be correct, Then my webpage is:
var socket = new SockJS("/myapp-web/api/ws/secondep/",undefined,options);
var stompClient = Stomp.over(socket);
stompClient.connect({
company : "xxx"
}, function(frame) {
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/register', function(message){
console.log('message: ' + message);
});
stompClient.subscribe('/topic/update', function(message){
console.log('message: ' + message);
});
And the connection works.
Now On my jms listener I tried to send a message in this way:
public class ImporterListener implements MessageListener {
Logger logger = LoggerFactory.getLogger(ImporterListner.class);
#SendTo("/topic/register")
private String TestMessage() {
return "TestMessage";
}
#Override
public void onMessage(Message message) {
logger.info("Request on message");
if (message instanceof MapMessage) {
MapMessage t = (MapMessage) message;
TestMessage(); //<--- have to send the message here
But it doesn’t work.
The questions are:
How to send a message?
Where do I have to specify the end point (secondep) when I send a message?
Thank you! any help is appreciated!
TestMessage(); //<--- have to send the message here
No, it has't to send, because you use method from the same class, but #SendTo makes your ImporterListener as proxy and Advice will work on method only from another component.
You should inject this:
#Autowired
#Qualifier("brokerMessagingTemplate")
private MessageSendingOperations brokerMessagingTemplate;
And send a message using that:
brokerMessagingTemplate.convertAndSend("/topic/register", "TestMessage");
Where do I have to specify the end point (secondep) when I send a message?
It is for the #MessageMapping("/ws/secondep") on some POJO method to receive message from clients. It isn't for the sending part.