java-stomp-ws's Introduction

STOMP over WebSocket implementation in Java

This is a STOMP protocol implementation.

Example backend using Spring Boot

The following example is taken from Spring's "Using WebSocket to build an interactive web application" guide but with SockJS disabled.

Configuration

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

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

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/gs-guide-websocket");
    }
}

Controller

@Controller
public class GreetingController {

    @MessageMapping("/hello")
    @SendTo("/topic/greetings")
    public Greeting greeting(HelloMessage message) throws Exception {
        Thread.sleep(1000); // simulated delay
        return new Greeting("Hello, " + message.getName() + "!");
    }
}

Usage

See the included client example module.

final StompClient stompSocket = new StompClient(URI.create("ws://localhost:8080/gs-guide-websocket"));

// Wait for a connection to establish
boolean connected;
try {
    connected = stompSocket.connectBlocking();
} catch (InterruptedException e) {
    e.printStackTrace();
    return;
}

if (!connected) {
    System.out.println("Failed to connect to the socket");
    return;
}

// Subscribing to a topic
stompSocket.subscribe("/topic/greetings", new StompMessageListener() {

    @Override
    public void onMessage(String message) {
        System.out.println("Server message: " + message);

        // Disconnect
        stompSocket.close();
    }
});

// Sending JSON message to a server
String message = "{\"name\": \"Jack\"}";
stompSocket.send("/app/hello", message);

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