@ServerEndpoint cannot inject service

  //  这里使用静态，让 service 属于类
    private static StringRedisTemplate redissonService;

    // 注入的时候，给类的 service 注入
    @Autowired
    public void setChatService(StringRedisTemplate chatService) {
    
    
        WebSocketServer.redissonService = chatService;
    }