Java实现WebSocket四个步骤

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws").withSockJS();
    }
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.enableSimpleBroker("/topic");
        registry.setApplicationDestinationPrefixes("/app");
    }
}

@Controller
public class WebSocketController {
    @MessageMapping("/hello")
    @SendTo("/topic/greetings")
    public String greeting(String message) throws Exception {
        return "Hello, " + HtmlUtils.htmlEscape(message) + "!";
    }
}

var socket = new SockJS('/ws');
var stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
    stompClient.subscribe('/topic/greetings', function(greeting){
        console.log(JSON.parse(greeting.body).content);
    });
});
stompClient.send("/app/hello", {}, JSON.stringify({'name': 'your name'}));