using (FileStream fs = File.OpenRead("1.xlsx")) {
                IWorkbook wk = new XSSFWorkbook(fs);  //读取03的xls                
                //IWorkbook wk = new HSSFWorkbook(); //读取07之xlsx
                for (int i = 0; i < wk.NumberOfSheets; i++) {
                    ISheet sheet = wk.GetSheetAt(i);
                    Console.WriteLine("============{0}==Start============", sheet.SheetName);
                    for (int j = 0; j <= sheet.LastRowNum; j++) {
                        IRow row = sheet.GetRow(j);
                        for (int k = 0; k < row.LastCellNum; k++) {
                            ICell cell = row.GetCell(k);
                            Console.WriteLine(cell.ToString() + "\t");
                        }
                    }
                    Console.WriteLine("============{0}==End==============", sheet.SheetName);
                }
            }