java导入xls和xlsx格式

InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
Sheet sheet = null;
//读写xls和xlsx格式时，HSSFWorkbook针对xls，XSSFWorkbook针对xlsx
if (POIFSFileSystem.hasPOIFSHeader(inputStream)) {
HSSFWorkbook workBook = new HSSFWorkbook(new BufferedInputStream(inputStream));
sheet = workBook.getSheetAt(0);
}else{
XSSFWorkbook workBook = new XSSFWorkbook(new BufferedInputStream(inputStream));
sheet = workBook.getSheetAt(0);
}