How to use Java backend technology to achieve real-time data updates?

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/dataUpdate")
public class DataUpdateEndpoint {

    @OnOpen
    public void onOpen(Session session) {
        // 连接建立时执行的代码
    }

    @OnMessage
    public void onMessage(String message, Session session) {
        // 处理客户端发送的消息
    }

    @OnClose
    public void onClose(Session session) {
        // 连接关闭时执行的代码
    }

    @OnError
    public void onError(Throwable error) {
        // 发生错误时执行的代码
    }
}

var socket = new WebSocket("ws://localhost:8080/dataUpdate");

socket.onopen = function() {
    // 连接建立时执行的代码
}

socket.onmessage = function(event) {
    var data = event.data;
    // 处理接收到的实时数据
}

socket.onclose = function() {
    // 连接关闭时执行的代码
}

// 发送实时数据到后端
function sendData(data) {
    socket.send(data);
}

import javax.jms.*;
import org.apache.activemq.ActiveMQConnectionFactory;

public class DataUpdateQueue {

    private static final String BROKER_URL = "tcp://localhost:61616";
    private static final String QUEUE_NAME = "dataUpdateQueue";

    public void startListening() throws JMSException {
        ConnectionFactory factory = new ActiveMQConnectionFactory(BROKER_URL);
        Connection connection = factory.createConnection();
        connection.start();

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination destination = session.createQueue(QUEUE_NAME);
        MessageConsumer consumer = session.createConsumer(destination);

        consumer.setMessageListener(new MessageListener() {
            @Override
            public void onMessage(Message message) {
                // 处理接收到的实时数据
            }
        });
    }

    public void sendData(String data) throws JMSException {
        ConnectionFactory factory = new ActiveMQConnectionFactory(BROKER_URL);
        Connection connection = factory.createConnection();
        connection.start();

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination destination = session.createQueue(QUEUE_NAME);
        MessageProducer producer = session.createProducer(destination);
        TextMessage message = session.createTextMessage(data);
        producer.send(message);

        connection.close();
    }
}

// 发送实时数据到后端
function sendData(data) {
    fetch('/dataUpdate', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({data: data})
    });
}

// 接收后端传来的实时数据
function processData(data) {
    // 处理接收到的实时数据
}