JAVA导入Excel文件保存数据

@RequestMapping("/updateFile")
public void updateFile (MultipartFile file, HttpServletRequest req, HttpServletResponse resp) throws IOException {
    //将上传到的MultipartFile转为输入流，然后交给POI去解析即可。可以分为如下四个步骤：
    //1.创建HSSFWorkbook对象
    HSSFWorkbook workbook = new HSSFWorkbook(new POIFSFileSystem(file.getInputStream()));
    //2.获取一共有多少sheet，然后遍历
    int numberOfSheets = workbook.getNumberOfSheets();
    for (int i = 0; i < numberOfSheets; i++) {
        HSSFSheet sheet = workbook.getSheetAt(i);
        //3.获取sheet中一共有多少行，遍历行（注意第一行是标题）
        int physicalNumberOfRows = sheet.getPhysicalNumberOfRows();
        News news;
        for (int j = 0; j < physicalNumberOfRows; j++) {
            if (j == 0) {
                continue;//标题行
            }
            //4.获取每一行有多少单元格，遍历单元格
            int physicalNumberOfCells = sheet.getRow(j).getPhysicalNumberOfCells();
            news=new News();
            for (int k = 0; k < physicalNumberOfCells; k++) {
                //获取单元格
                HSSFCell cell = sheet.getRow(j).getCell(k);
                //设置单元格类型
                cell.setCellType(CellType.STRING);
                //获取单元格数据
                System.out.println(cell.getStringCellValue());
            }
        }
    }
}

获取到单元格的数据就可以保存到类里面

注意点：获取单元格数据之前一定要设置单元格类型，否则会报错！