Excel表的导入到数据库

（1）工具类

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.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

public class ExcelImport {
    private final static String excel2003L =".xls";    //2003- 版本的excel
    private final static String excel2007U =".xlsx";   //2007+ 版本的excel
    /**
     * Excel导入
     */
    public static  List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{
        List<List<Object>> list = null;
        //创建Excel工作薄
        Workbook work = getWorkbook(in,fileName);
        if(null == work){
            throw new Exception("创建Excel工作薄为空！");
        }
        Sheet sheet = null;
        Row row = null;
        Cell cell = null;
        list = new ArrayList<List<Object>>();
        //遍历Excel中所有的sheet
        for (int i = 0; i < work.getNumberOfSheets(); i++) {
            sheet = work.getSheetAt(i);
            if(sheet==null){continue;}
            //遍历当前sheet中的所有行
            //包涵头部，所以要小于等于最后一列数,这里也可以在初始值加上头部行数，以便跳过头部
            for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
                //读取一行
                row = sheet.getRow(j);
                //去掉空行和表头
                if(row==null||row.getFirstCellNum()==j){continue;}
                //遍历所有的列
                List<Object> li = new ArrayList<Object>();
                for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
                    cell = row.getCell(y);
                    li.add(getCellValue(cell));
                }
                list.add(li);
            }
        }
        return list;
    }
    /**
     * 描述：根据文件后缀，自适应上传文件的版本
     */
    public static  Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
        Workbook wb = null;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if(excel2003L.equals(fileType)){
            wb = new HSSFWorkbook(inStr);  //2003-
        }else if(excel2007U.equals(fileType)){
            wb = new XSSFWorkbook(inStr);  //2007+
        }else{
            throw new Exception("解析的文件格式有误！");
        }
        return wb;
    }
    /**
     * 描述：对表格中数值进行格式化
     */
    public static  Object getCellValue(Cell cell){
        Object value = null;
        DecimalFormat df = new DecimalFormat("0");  //格式化字符类型的数字
        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");  //日期格式化
        DecimalFormat df2 = new DecimalFormat("0.00");  //格式化数字
        switch (cell.getCellType()) {
            case Cell.CELL_TYPE_STRING:
                value = cell.getRichStringCellValue().getString();
                break;
            case Cell.CELL_TYPE_NUMERIC:
                if("General".equals(cell.getCellStyle().getDataFormatString())){
                    value = df.format(cell.getNumericCellValue());
                }else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){
                    value = sdf.format(cell.getDateCellValue());
                }else{
                    value = df2.format(cell.getNumericCellValue());
                }
                break;
            case Cell.CELL_TYPE_BOOLEAN:
                value = cell.getBooleanCellValue();
                break;
            case Cell.CELL_TYPE_BLANK:
                value = "";
                break;
            default:
                break;
        }
        return value;
    }

}

（2）调用该工具

 @PostMapping("/imExcel")
    public Response imExcel(@Validated MultipartFile mf) throws Exception {
        if (mf == null) {
            return Response.paramError("导入的表不能为空");
        }
   
        InputStream inputStream = mf.getInputStream();

//读取Excel表
        List<List<Object>> resultList = ExcelImport.getBankListByExcel(inputStream,mf.getOriginalFilename());
        List<Getway> getways = new ArrayList<>();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        for (int i = 0; i < resultList.size(); i++) {
            List<Object> list = resultList.get(i);

            if (CommonUtil.isBlank(list.get(0).toString())) {
                Response.paramError("网关名称不能为空");
            }
            if (CommonUtil.isBlank(list.get(1).toString())) {
                Response.paramError("设备码不能为空");
            }
            if (CommonUtil.isBlank(list.get(2).toString())) {
                Response.paramError("地址不能为空");

            }
            Getway getway=new Getway();

            getway.setName(list.get(0).toString());
            getway.setNumber(list.get(1).toString());
            getway.setAddress(list.get(2).toString());
            getway.setOnlineFlag(Integer.parseInt(list.get(3).toString()));
            Date date=sdf.parse(list.get(4).toString());
            getway.setCreateTime(date);
            getways.add(getway);
            //getwayService.insert(getway);
        }
        return Response.ok(getwayService.insertBatch(getways));
    }

（3）Excel表

（4）数据库结果