伺服器端：

@Configuration
public class WebSocketConfig {

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

package cn.socket;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;


@Component
@ServerEndpoint("/pull/test/{id}")
public class WebSocketServer {

    public WebSocketServer() {
        System.out.println("---------建立socket---------");
    }

    private static int onlineCount = 0;
    private static ConcurrentHashMap<String, WebSocketServer> webSocketSet = new ConcurrentHashMap<>();
    private static CopyOnWriteArraySet<WebSocketServer> webSockets =new CopyOnWriteArraySet<>();

    //與某個客戶端的連線會話，需要通過它來給客戶端傳送資料
    private Session session;

    private static Logger log = LogManager.getLogger(WebSocketServer.class);
    private String id = "";
    /**
     * 連線建立成功呼叫的方法*/
    @OnOpen
    public void onOpen(@PathParam(value = "id") String id, Session session) {
        this.session = session;
        this.id = id;//接收到傳送訊息的人員編號
        webSocketSet.put(id, this);     //加入set中
        webSockets.add(this);
        addOnlineCount();           //線上數加1
        log.info("使用者"+id+"加入！當前線上人數為" + getOnlineCount());
        try {
            sendMessage("連線成功");
        } catch (IOException e) {
            log.error("websocket IO異常");
        }
    }

    /**
     * 連線關閉呼叫的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //從set中刪除
        subOnlineCount();           //線上數減1
        log.info("有一連線關閉！當前線上人數為" + getOnlineCount());
    }

    /**
     * 收到客戶端訊息後呼叫的方法
     *
     * @param message 客戶端傳送過來的訊息*/
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("來自客戶端的訊息:" + message);
        //可以自己約定字串內容，比如 內容|0 表示資訊群發，內容|X 表示資訊發給id為X的使用者
        String sendMessage = message.split("[|]")[0];
        String sendUserId = message.split("[|]")[1];
        try {
            if(sendUserId.equals("0"))
                sendtoAll(sendMessage);
            else
                sendtoUser(sendMessage,sendUserId);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("發生錯誤");
        error.printStackTrace();
    }


    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 傳送資訊給指定ID使用者，如果使用者不線上則返回不線上資訊給自己
     * @param message
     * @param sendUserId
     * @throws IOException
     */
    public void sendtoUser(String message,String sendUserId) throws IOException {
        if (webSocketSet.get(sendUserId) != null) {
            if(!id.equals(sendUserId))
                webSocketSet.get(sendUserId).sendMessage( "使用者" + id + "發來訊息：" + " <br/> " + message);
            else
                webSocketSet.get(sendUserId).sendMessage(message);
        } else {
            //如果使用者不線上則返回不線上資訊給自己
            sendtoUser("當前使用者不線上",id);
        }
    }

    /**
     * 傳送資訊給所有人
     * @param message
     * @throws IOException
     */
    public void sendtoAll(String message) throws IOException {
        for (String key : webSocketSet.keySet()) {
            try {
                webSocketSet.get(key).sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void sendtoAll2(String message) throws IOException {
        for (WebSocketServer webSocket : webSockets) {
            try {
                webSocket.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }


    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }

}

@RestController("outController")
@Api(tags = "外部介面管理")
@CrossOrigin //跨域訪問 swagger 要使用到
public class OutController extends BaseController {

    @Autowired
    private WebSocketServer webSocketServer;

  
    @ApiOperation("推送資料")
    @GetMapping("/toHome")
    public void toHome() throws Exception {
        webSocketServer.sendtoAll2("1");
    }
}

　　前端程式碼：

<!DOCTYPE html>
<html style="height: 100%;">

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
    <title>建立緩衝區</title>
    
    
    
</head>

<body style="height: 100%;">
    
    <script type="text/javascript">
	    const ws=new WebSocket('ws://localhost:33002/tianjin-cim/tuchu/apis/pull/test/1');
    ws.onmessage =function(e){
      console.log(e)
    };
	
    </script>
</body>

</html>