SpringBoot使用WebSocket实现前后端交互的操作方法

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

@Component
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter(){
        return new ServerEndpointExporter();
    }
}

@Component  //注册到容器中
@ServerEndpoint("/webSocket")  //接收websocket请求路径
@Slf4j
public class WebSocket {
    //当前连接（每个websocket连入都会创建一个WebSocket实例）
    private Session session;
    //定义一个websocket容器存储session,即存放所有在线的socket连接
    private static CopyOnWriteArraySet<WebSocket> webSocketSet = new CopyOnWriteArraySet<>();
    //处理连接建立
    @OnOpen
    public void opOpen(Session session){
        this.session = session;
        log.info("【有新的客户端连接了】：{}",session.getId());
        webSocketSet.add(this);  //将新用户加入在线组
        log.info("【websocket消息】有新的连接，总数：{}",webSocketSet.size());
    }
    //处理连接关闭
    @OnClose
    public void Onclose(){
        webSocketSet.remove(this);
        log.info("【websocket消息】连接断开，总数：{}",webSocketSet.size());
    //接受消息
    @OnMessage
    public void onMessage(String message){
        log.info("【websocket消息】收到客户端发来的消息：{}",message);
    // 群发消息
    public void sendMessage(String message) {
        for (WebSocket webSocket : webSocketSet) {
            log.info("【websocket消息】广播群发消息,message={}",message);
            try {
                webSocket.session.getBasicRemote().sendText(message);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
}

<script>
    var websocket = null;
    if('WebSocket' in window){
        websocket = new WebSocket('ws://localhost:8080/webSocket');
    }else{
        alert('当前浏览器不支持websocket消息通知');
    }
    //连接成功建立的回调方法
    websocket.onopen = function (event) {
        console.log("ws建立连接成功");
    //连接关闭的回调方法
    websocket.onclose = function (event) {
        console.log("ws连接关闭");
    //接收到消息的回调方法
    websocket.onmessage = function (event) {
        /*setMessageInnerHTML(event.data);*/
       // alert("ws接收返回消息："+event.data);
        console.log("服务器返回消息： " + event.data);
        //弹窗提醒(要用到JQuary,所以要先引入JQuary)   播放音乐
        $('#mymodal').modal('show')
    //连接发生错误的回调方法
    websocket.onerror = function(event){
        alert('websocket通信发生错误！')
    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function() {
        websocket.close();
    </script>

@Autowired
private WebSocket webSocket;
@Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {//创建订单
        。。。。（具体代码省略）
       //创建新订单  发送websocket消息
        webSocket.sendMessage(orderDTO.getOrderId());
        return orderDTO;
    }