import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.joda.time.DateTime;

import java.io.FileInputStream;
import java.util.Date;

public class ImportExcelUtils {
public void cellType(FileInputStream inputStream) throws Exception {
//建立工作簿
//03版，excel字尾為.xls的，07版本為.xlsx的，需要將HSSFWorkbook()更換為XSSFWorkbook()
Workbook workbook = new HSSFWorkbook(inputStream);
Sheet sheet = workbook.getSheetAt(0);//獲取第一頁
//獲取標題內容
Row rowTitle = sheet.getRow(0);
if (rowTitle != null){
int cellCount = rowTitle.getPhysicalNumberOfCells();//獲取列的數量
for (int cellNum = 0; cellNum < cellCount ; cellNum++) {
Cell cell = rowTitle.getCell(cellNum);
if (cell != null){
int cellType = cell.getCellType();//獲取列的型別
}
}
}

    //讀取表中內容
    int rowCount = sheet.getPhysicalNumberOfRows();
    for (int rowNum = 1; rowNum < rowCount; rowNum++) {
        Row rowData = sheet.getRow(rowNum);
        if (rowData != null){
            //讀取列
            int cellCount = rowData.getPhysicalNumberOfCells();
            for (int cellNum = 0; cellNum < cellCount ; cellNum++) {
                Cell cell = rowData.getCell(cellNum);
                if (cell != null){
                    int cellType = cell.getCellType();
                    String cellValue = "";
                    //判斷列資料型別
                    switch (cellType){
                        case HSSFCell.CELL_TYPE_STRING://字串
                            cellValue = cell.getStringCellValue();
                            break;
                        case HSSFCell.CELL_TYPE_BOOLEAN://布林
                            cellValue = String.valueOf(cell.getBooleanCellValue());
                            break;
                        case HSSFCell.CELL_TYPE_BLANK://空
                            break;
                        case HSSFCell.CELL_TYPE_NUMERIC://數字（日期、數字）
                            if (HSSFDateUtil.isCellDateFormatted(cell)){//日期
                                Date date = cell.getDateCellValue();
                                cellValue = new DateTime(date).toString("yyyy-MM-dd");
                            }else{
                                //防止數字過長
                                cell.setCellType(HSSFCell.CELL_TYPE_STRING);
                                cellValue = cell.toString();
                            }
                            break;
                        case HSSFCell.CELL_TYPE_ERROR://錯誤
                            break;
                    }
                }
            }
        }
    }

    //關閉流
    inputStream.close();
}
 

}