为什么会出现bean没有被注入的情况？

Question

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.example.springboot.entity.User;
import com.example.springboot.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.context.support.RequestHandledEvent;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;
@Component
public class  TokenUtils {
    private static IUserService staticUserService;
    @Resource
    private static IUserService userService;
    @PostConstruct
    public void setUserService(){
        staticUserService=userService;
    }
    public  static String gentoken(String userid,String sign){
      return   JWT.create().withAudience(userid)//将userid保存在token中
        .withExpiresAt(DateUtil.offsetHour(new Date(),2))//两小时token过期
        .sign(Algorithm.HMAC256(sign));//以pasword作为密钥
    }
    //后端获取当前登录用户信息
    public static User getCurrentUser(){
            try {
                HttpServletRequest request=((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
                String token=request.getHeader("token");
                if (StrUtil.isNotBlank(token))
                {
                String    userid= JWT.decode(token).getAudience().get(0);;
                return  staticUserService.getById(Integer.valueOf(userid));}

            }catch (Exception e){
                 return null;
            }


return null;
    }
}

Answer 1

非静态属性写成静态属性了