java中如何在靜態方法中調用service層接口

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

  //聲明對象
  public static XxxController xxxController;

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

  //靜態方法
  private static void xxStatic(){
    //業務邏輯
    xxxController.xxxService.xxAdd(Pojo pojo)
  }
}