java poi导入excel

@RequestMapping(value = "/user/import", method = RequestMethod.POST)
    public @ResponseBody String importRecords(MultipartFile file) {
        try{
            StringBuilder errorSb = new StringBuilder();
            List list = new ArrayList<>();
            XSSFWorkbook workbook = new XSSFWorkbook(file.getInputStream());
            XSSFSheet sheet = workbook.getSheetAt(0);
            int rows = sheet.getPhysicalNumberOfRows();

            Map> map = new HashMap<>();

            Date now = new Date();
            for (int i = 1; i < rows; i++) {
                XSSFRow row = sheet.getRow(i);
                if (row == null) {
                    log.info("此行数据为空");
                    continue;
                }

                String userId = this.getRowStringValue(row.getCell(0));
                String name = this.getRowStringValue(row.getCell(1));
                String phone = this.getRowStringValue(row.getCell(2));
                String address = this.getRowStringValue(row.getCell(3));
                
                if (StringUtils.isEmpty(userId) && StringUtils.isEmpty(name)
                        && StringUtils.isEmpty(phone) && StringUtils.isEmpty(address)) {
                    log.info("此行数据为空");
                    continue;
                }
                
                // 校验一些必填
                if(StringUtils.isEmpty(userId) || !StringUtils.isNumeric(userId)){
                    errorSb.append("第"+i+"行，工号为空或者值不正确
");
                    continue;
                }

                if(StringUtils.isEmpty(name)){
                    errorSb.append("第"+i+"行，姓名为空
");
                    continue;
                }
                if(StringUtils.isEmpty(phone)){
                    errorSb.append("第"+i+"行，手机号码为空
");
                    continue;
                }
               
                User record = new User();
                record.setId(Integer.valueOf(userId));
                record.setName(name);
                record.setPhone(phone);
                record.setAddress(address);
                list.add(record);
            }
            if(errorSb.length() > 0){
                log.info("导入校验报错", errorSb.toString());
                return "导入校验报错";
            }

            if(list != null && !list.isEmpty()){
                userService.batchInsert(list);
            }
        }catch (Exception e){
            log.error("员工导入异常：", e);
            return "员工导入异常";
        }

        return "success";
    }


    public static String getRowStringValue(XSSFCell cell){
        String result;
        if(cell != null && cell.getCellType() == Cell.CELL_TYPE_STRING){
            result = cell.getStringCellValue();
        }else if(cell != null && cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
            DecimalFormat df = new DecimalFormat("0");
            result = df.format(cell.getNumericCellValue());
            if (result.endsWith(".0")) {
                result = result.replace(".0", "");
            }
        }else {
            result = cell == null ? "" : cell.toString();
        }
        return result;
    }

pom文件加上poi依赖

            org.apache.poi
            poi
            3.9
        

        
            org.apache.poi
            poi-ooxml
            3.9