java使用poi包完成將excel資料的讀寫

注意事項：
1. excel中單元格格式和mysql資料庫中欄位型別的相互轉換
判斷excel中單元格中資料的型別

Object cellValue = null;//cellValue的值
switch (cell.getCellType()) {
    case Cell.CELL_TYPE_STRING:
        System.out.println(cell.getRichStringCellValue().getString());
        cellValue = cell.getRichStringCellValue().getString();
        break
 
;
    case Cell.CELL_TYPE_NUMERIC:
        if (DateUtil.isCellDateFormatted(cell)) {
            System.out.println(cell.getDateCellValue());
            cellValue= cell.getDateCellValue();
            //TODO 可以按日期格式轉換
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"
 
); 
            String time = formatter.format(cellValue);
            System.out.println("formater time:"+time);
            }else{
             System.out.println(cell.getNumericCellValue());
        }
        break;                                         
    case Cell.CELL_TYPE_BOOLEAN:
        System.out.println(cell.getBooleanCellValue());
        cellValue = cell.getBooleanCellValue();
        break
 
;
    case Cell.CELL_TYPE_FORMULA:
        System.out.println(cell.getCellFormula());
        cellValue = cell.getCellFormula();
        break;
    default:
        System.out.println("not find match type.");
}