웹 소켓 핸들러 @Service public class WebSocketHandler extends TextWebSocketHandler { //List list = new ArrayList(); List admins = new ArrayList(); @Override public void afterConnectionEstablished(WebSocketSession session) throws Exception { System.out.println("연결됨 = " + session); //list.add(session); if(getId(session) != null) { admins.add(session); } } @Override protected void handleTextMessage(WebSo..