springboot websocket 注入bean失败

第一种方式：将messageService 注入

@ServerEndpoint(value = "/websocket")
@Component
public class WebSocketServer {

    //这里使用静态，让 service 属于类
    public static MessageServiceImpl messageService;

    /**
     * 给类的service 注入
     * spring管理的都是单例（singleton）和 websocket （多对象）相冲突
     *
     * @param messageService
     */
    @Autowired
    public void setMessageService(MessageServiceImpl messageService) {
        WebSocketServer.messageService = messageService;
    }
}

第二种方式
或者将

@Autowired
    public void setMessageService(MessageServiceImpl messageService) {
        WebSocketServer.messageService = messageService;
    }

写在websocketConfig中

@Configuration
public class WebSocketConfig {

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

    /**
     *手动注入一个全局变量
     * @param messageService
     */
    @Autowired
    public void setMessageService(MessageServiceImpl messageService) {
        WebSocketServer.messageService = messageService;
    }
}