XSSFWorkbook book = new XSSFWorkbook(file.getInputStream());
        XSSFSheet sheet = book.getSheetAt(0);
        for (int i = 1; i < sheet.getLastRowNum() + 1; i++) {
            XSSFRow row = sheet.getRow(i);
            row.getCell(0).setCellType(CellType.STRING);
            row.getCell(1).setCellType(CellType.STRING);
            row.getCell(2).setCellType(CellType.STRING);
            String v1 = row.getCell(0).getStringCellValue();
            String v2 = row.getCell(1).getStringCellValue(); 
            String v3 = row.getCell(2).getStringCellValue();
        }