Spring boot 工具静态类无法使用 Mapper

可以添加以下注解：

类@Component

使用关键字Autowired对 mapper 注解

init 方法初始化对mapper的引用。 

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author huochengyan
 * @version 1.0
 * @date 2022/9/7 
 */
@Component
public class GetLoginUserSensorHelper {
    /**
     * 在静态工具类中注入mapper的方式示例
     */
        @Autowired
        private SensorMapper sensorMapper;
        private static GetLoginUserSensorHelper codeMapUtils;
        @PostConstruct
        public void init(){
            codeMapUtils=this;
            codeMapUtils.sensorMapper=this.sensorMapper;
        }

    /**
     * 公共方法
     * @param minesId
     * @return
     */
    public static List<Integer> getSensorPidByMinesId(Integer minesId){
        List<Integer> sensorPids=new ArrayList<>();
        SensorExample sensorExample=new SensorExample();
        SensorExample.Criteria criteriaSensor = sensorExample.createCriteria();
        criteriaSensor.andMinesIdEqualTo(minesId);
        List<Sensor> sensorList=GetLoginUserSensorHelper.codeMapUtils.sensorMapper.selectByExample(sensorExample);
        sensorPids=sensorList.stream().map(x->x.getPid()).collect(Collectors.toList());
        return  sensorPids;
    }
}