JAVA 导入EXCLE，处理时间字段

import com.fengshun.systemBusiness.dao.BloodRecordsDao;
import com.fengshun.systemBusiness.entity.BloodRecords;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;


public List<BloodRecords> getList(InputStream fis) throws Exception {
        List<BloodRecords> list = new ArrayList<>();
        Workbook workbook = new HSSFWorkbook(fis);
        Sheet sheet;
        //获取sheet数量
        int number = workbook.getNumberOfSheets();
        for (int i = 0; i < number; i++) {
            sheet = workbook.getSheetAt(i);
            if (sheet == null) {
                continue;
            }
            //循环行
            for (int j = 1; j < sheet.getLastRowNum(); j++) {
                Row row = sheet.getRow(j);
                Cell cell0 = row.getCell(0);
                Cell cell1 = row.getCell(1);
                Cell cell2 = row.getCell(2);
                Cell cell3 = row.getCell(3);
                Cell cell4 = row.getCell(4);
                Cell cell5 = row.getCell(5);
                Date date = HSSFDateUtil.getJavaDate(cell0.getNumericCellValue());
                BloodRecords b0 = new BloodRecords();
                b0.setPatientId("1503256397");
                b0.setVisitId(2L);
                b0.setCollectDate(date);
                b0.setBloodValue(Double.valueOf(cell1.toString()));
                b0.setDynamicBlood(true);
                BloodRecords b1 = new BloodRecords();
                b1.setPatientId("1804142342");
                b1.setVisitId(1L);
                b1.setCollectDate(date);
                b1.setBloodValue(Double.valueOf(cell2.toString()));
                b1.setDynamicBlood(true);
                BloodRecords b2 = new BloodRecords();
                b2.setPatientId("1611147489");
                b2.setVisitId(2L);
                b2.setCollectDate(date);
                b2.setBloodValue(Double.valueOf(cell3.toString()));
                b2.setDynamicBlood(true);
                BloodRecords b3 = new BloodRecords();
                b3.setPatientId("1805056176");
                b3.setVisitId(1L);
                b3.setCollectDate(date);
                b3.setBloodValue(Double.valueOf(cell4.toString()));
                b3.setDynamicBlood(true);
                BloodRecords b4 = new BloodRecords();
                b4.setPatientId("1804302808");
                b4.setVisitId(1L);
                b4.setCollectDate(date);
                b4.setBloodValue(Double.valueOf(cell5.toString()));
                b4.setDynamicBlood(true);
                list.add(b0);
                list.add(b1);
                list.add(b2);
                list.add(b3);
                list.add(b4);
            }
        }
        fis.close();
        return list;
    }