SPRING中用websocket，无法实例化，注入bean为null

解决方案：改为静态变量

private static  PostingsHandlerOnlineServiceI postingsHandlerOnlineService;
 

@Autowired
public void setIAppChatService(PostingsHandlerOnlineServiceI serviceImpl) {
    PostingsHandlerOnlineController.postingsHandlerOnlineService = serviceImpl;
}