java中如何在静态方法中调用service层接口

@Controller
@RequestMapping("XxxController")
public class XxxController{
  
  @Resource
  private XxxService xxxService;

  //声明对象
  public static XxxController xxxController;

  @PostConstruct
  public void init(){
    xxxController = this;
    xxxController.xxxService=this.xxxService;
  }

  //静态方法
  private static void xxStatic(){
    //业务逻辑
    xxxController.xxxService.xxAdd(Pojo pojo)
  }
}