poi讀取excel

package xls;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class XlsMain {

  public static void main( String[] args) throws IOException {
    XlsMain xlsMain = new XlsMain();
    
    xlsMain.readXls();
  }

  private void readXls() throws IOException{
    InputStream is = new FileInputStream( "D:\\excel\\xls_test2.xls");
    HSSFWorkbook hssfWorkbook = new HSSFWorkbook( is); 
    
    // 循環工作表Sheet
    for(int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++){
      HSSFSheet hssfSheet = hssfWorkbook.getSheetAt( numSheet);
      if(hssfSheet == null){
        continue;
      }
      
      // 循環行Row 
      for(int rowNum = 0; rowNum <= hssfSheet.getLastRowNum(); rowNum++){
        HSSFRow hssfRow = hssfSheet.getRow( rowNum);
        if(hssfRow == null){
          continue;
        }
        
        // 循環列Cell  
        for(int cellNum = 0; cellNum <= hssfRow.getLastCellNum(); cellNum++){
          HSSFCell hssfCell = hssfRow.getCell( cellNum);
          if(hssfCell == null){
            continue;
          }
          
          System.out.print("    " + getValue( hssfCell));
        }
        System.out.println();
      }
    }
  }
  
  @SuppressWarnings("static-access")
  private String getValue(HSSFCell hssfCell){
    if(hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN){
      return String.valueOf( hssfCell.getBooleanCellValue());
    }else if(hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC){
      return String.valueOf( hssfCell.getNumericCellValue());
    }else{
      return String.valueOf( hssfCell.getStringCellValue());
    }
  }
  
}