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

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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {

    @Autowired
    private MyWsHandler myWsHandler;

    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry
                .addHandler(myWsHandler, "myWs")
                //允许跨域
                .setAllowedOrigins("*");
    }
}

/**
 * ws消息处理类
 */
@Component
@Slf4j
public class MyWsHandler extends AbstractWebSocketHandler {

    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        log.info("建立ws连接");
        WsSessionManager.add(session.getId(),session);
    }

    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        log.info("发送文本消息");
        // 获得客户端传来的消息
        String payload = message.getPayload();
        log.info("server 接收到消息 " + payload);
        session.sendMessage(new TextMessage("server 发送给的消息 " + payload + "，发送时间:" + LocalDateTime.now().toString()));
    }

    @Override
    protected void handleBinaryMessage(WebSocketSession session, BinaryMessage message) throws Exception {
        log.info("发送二进制消息");
    }

    @Override
    public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
        log.error("异常处理");
        WsSessionManager.removeAndClose(session.getId());
    }

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        log.info("关闭ws连接");
        WsSessionManager.removeAndClose(session.getId());
    }
}

/**
 * 消息生成job
 */
@Slf4j
@Component
public class MessageJob {
    @Autowired
    WsService wsService;

    /**
     * 每5s发送
     */
    @Scheduled(cron = "0/5 * * * * *")
    public void run(){
        try {
            wsService.broadcastMsg("自动生成消息 "  + LocalDateTime.now().toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

/**
 * ws操作相关服务
 */
@Service
@Slf4j
public class WsService {

    /**
     * 发送消息
     * @param session
     * @param text
     * @return
     * @throws IOException
     */
    public void sendMsg(WebSocketSession session, String text) throws IOException {
        session.sendMessage(new TextMessage(text));
    }

    /**
     * 广播消息
     * @param text
     * @return
     * @throws IOException
     */
    public void broadcastMsg(String text) throws IOException {
        for (WebSocketSession session: WsSessionManager.SESSION_POOL.values()) {
            session.sendMessage(new TextMessage(text));
        }
    }

}

@Slf4j
public class WsSessionManager {
    /**
     * 保存连接 session 的地方
     */
    public  static ConcurrentHashMap<String, WebSocketSession> SESSION_POOL = new ConcurrentHashMap<>();

    /**
     * 添加 session
     *
     * @param key
     */
    public static void add(String key, WebSocketSession session) {
        // 添加 session
        SESSION_POOL.put(key, session);
    }

    /**
     * 删除 session,会返回删除的 session
     *
     * @param key
     * @return
     */
    public static WebSocketSession remove(String key) {
        // 删除 session
        return SESSION_POOL.remove(key);
    }

    /**
     * 删除并同步关闭连接
     *
     * @param key
     */
    public static void removeAndClose(String key) {
        WebSocketSession session = remove(key);
        if (session != null) {
            try {
                // 关闭连接
                session.close();
            } catch (IOException e) {
                // todo: 关闭出现异常处理
                e.printStackTrace();
            }
        }
    }

    /**
     * 获得 session
     *
     * @param key
     * @return
     */
    public static WebSocketSession get(String key) {
        // 获得 session
        return SESSION_POOL.get(key);
    }
}

@SpringBootApplication
@EnableScheduling
public class SpringWsApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringWsApplication.class, args);
    }

}

<!DOCTYPE HTML>
<html>
<head>
    <title>My WebSocket</title>
</head>

<body>
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>


</body>

<script type="text/javascript">

    let ws = null;
    //判断当前浏览器是否支持WebSocket
    if ('WebSocket' in window) {
        ws = new WebSocket("ws://localhost:8333/myWs");
    }
    else {
        alert('当前浏览器 Not support websocket')
    }

    //连接发生错误的回调方法
    ws.onerror = function () {
        setMessageInnerHTML("WebSocket连接发生错误");
    };

    //连接成功建立的回调方法
    ws.onopen = function(event) {
        console.log("ws调用连接成功回调方法")
        //ws.send("")
    }
    //接收到消息的回调方法
    ws.onmessage = function(message) {
        console.log("接收消息：" + message.data);
        if (typeof(message.data) == 'string') {
            setMessageInnerHTML(message.data);
        }
    }
    //ws连接断开的回调方法
    ws.onclose = function(e) {
        console.log("ws连接断开")
        //console.log(e)
        setMessageInnerHTML("ws close");
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        console.log(innerHTML)
        document.getElementById('message').innerHTML += '接收的消息:' + innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        ws.close();
    }


    //发送消息
    function send(msg) {
        if(!msg){
            msg = document.getElementById('text').value;
            document.getElementById('message').innerHTML += "发送的消息:" + msg + '<br/>';
            ws.send(msg);
        }
    }
</script>
</html>