Java 使用multipartFile对象解析Execl_multipartfile解析excel

1.需要使用 multipartFile 包 package org.springframework.web.multipart;

2.数据校验

public String exportVehicleViol(MultipartFile multipartFile) {
        try {
            //对前端传递的文件进行校验
            if (multipartFile == null && multipartFile.getSize() == 0) {
                return "文件上传错误，重新上传";
            }
            //获取文件名称 判断文件是否为 Execl
            String filename = multipartFile.getOriginalFilename();
            if (!(filename.endsWith(".xls") || filename.endsWith(".xlsx"))) {
                return "文件上传格式有误，请重新上传";
            }
            List<EhicleViolation> ehicleViolations = null;
            InputStream inputStream = multipartFile.getInputStream();
            //根据文件格式 对应不同的api解析
            if (filename.endsWith(".xlsx")) {
                ehicleViolations = readXlsx(inputStream);
            } else {
                ehicleViolations = readXls(inputStream);
            }
            //数据保存
            saveBatch(ehicleViolations);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return JsonResult.Success("导入成功");
    }

3.主要解析的业务逻辑

①解析xls

//解析xls
    private List<EhicleViolation> readXls(InputStream inputStream) throws IOException {
        HSSFWorkbook sheets = new HSSFWorkbook(inputStream);
 
        //读取第一张sheet
        HSSFSheet sheetAt = sheets.getSheetAt(0);
        List<EhicleViolation> ehicleViolatsion = new ArrayList<>();
        //rowNum = 3 从第三行开始获取值
        for (int rowNum = 3; rowNum < sheetAt.getLastRowNum(); rowNum++) {
            EhicleViolation ehicleViolation = new EhicleViolation();
            HSSFRow row = sheetAt.getRow(rowNum);
 
            if (row != null) {
                //使用了getStringCellValue()方法来获取值，POI会判断单元格的类型，如果非字符串类型就会抛出上面的异常。
                //所以先使用setCellType()方法先将该单元格的类型设置为STRING
                //然后poi会根据字符串读取它
                row.getCell(0).setCellType(CellType.STRING);
                row.getCell(1).setCellType(CellType.STRING);
                row.getCell(2).setCellType(CellType.STRING);
                row.getCell(3).setCellType(CellType.STRING);
                row.getCell(4).setCellType(CellType.STRING);
                row.getCell(5).setCellType(CellType.STRING);
                row.getCell(6).setCellType(CellType.STRING);
                row.getCell(7).setCellType(CellType.STRING);
                row.getCell(8).setCellType(CellType.STRING);
                
                String stringCellValue0 = row.getCell(0).getStringCellValue();
               
                String stringCellValue1 = row.getCell(1).getStringCellValue();
                if (StringUtils.isNotBlank(stringCellValue1)) {
                    ehicleViolation.setUserDept(stringCellValue1);
                }
                //根据自己需要 获取表格中的数据
                String stringCellValue2 = row.getCell(2).getStringCellValue();
                if (StringUtils.isNotBlank(stringCellValue2)) {
                    ehicleViolation.setVehicleNumber(stringCellValue2);
                } else {
                    continue;
                }
                
            }
            EehicleViolations.add(EehicleViolation);
        }
        return EehicleViolations;
    }

②解析xlsx

//解析xlsx
    private List<VmsVehicleViolation> readXlsx(InputStream inputStream) throws IOException {
        XSSFWorkbook sheets1 = new XSSFWorkbook(inputStream);
 
        XSSFSheet sheetAt1 = sheets1.getSheetAt(0);
 
        List<EhicleViolation> ehicleViolatsion = new ArrayList<>();
        //rowNum = 3 从第三行开始获取值
        for (int rowNum = 3; rowNum < sheetAt.getLastRowNum(); rowNum++) {
            EhicleViolation ehicleViolation = new EhicleViolation();
            HSSFRow row = sheetAt.getRow(rowNum);
 
            if (row != null) {
                //使用了getStringCellValue()方法来获取值，POI会判断单元格的类型，如果非字符串类型就会抛出上面的异常。
                //所以先使用setCellType()方法先将该单元格的类型设置为STRING
                //然后poi会根据字符串读取它
                row.getCell(0).setCellType(CellType.STRING);
                row.getCell(1).setCellType(CellType.STRING);
                row.getCell(2).setCellType(CellType.STRING);
                row.getCell(3).setCellType(CellType.STRING);
                row.getCell(4).setCellType(CellType.STRING);
                row.getCell(5).setCellType(CellType.STRING);
                row.getCell(6).setCellType(CellType.STRING);
                row.getCell(7).setCellType(CellType.STRING);
                row.getCell(8).setCellType(CellType.STRING);
                
                String stringCellValue0 = row.getCell(0).getStringCellValue();
               
                String stringCellValue1 = row.getCell(1).getStringCellValue();
                if (StringUtils.isNotBlank(stringCellValue1)) {
                    ehicleViolation.setUserDept(stringCellValue1);
                }
                //根据自己需要 获取表格中的数据
                String stringCellValue2 = row.getCell(2).getStringCellValue();
                if (StringUtils.isNotBlank(stringCellValue2)) {
                    ehicleViolation.setVehicleNumber(stringCellValue2);
                } else {
                    continue;
                }
                
            }
            EehicleViolations.add(EehicleViolation);
        }
        return EehicleViolations;
    }

注意：对于不同的Execl Java提供了不同的解析对象 

xls使用HSSFWorkbook 对象进行解析 

xlsx使用XSSWorkbook 对象进行解析