poi开源jar包操作excel时读取单元格的标准方法

public static Object getCellValue(HSSFCell cell){	//参数可以包括int rowIndex, int cellnum	 
		if(cell == null){ 
			return null; 
	    }else if(cell.getCellType() == XSSFCell.CELL_TYPE_BLANK){ 
	      //System.out.println("第"+(rowIndex+1)+"行，第"+(cellnum+1)+"列  cellType为：CELL_TYPE_BLANK"); 
	    	return null;
	    }else if(cell.getCellType() == XSSFCell.CELL_TYPE_STRING){ 
	      //System.out.println("第"+(rowIndex+1)+"行，第"+(cellnum+1)+"列  cellType为：CELL_TYPE_STRING  值为："+cell.getRichStringCellValue().getString()); 
	    	return cell.getRichStringCellValue().getString();
	    }else if(cell.getCellType() == XSSFCell.CELL_TYPE_NUMERIC){	    	 
	        if(HSSFDateUtil.isCellDateFormatted(cell)){        	 
	        	Date date = cell.getDateCellValue(); 
	            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); 
	            //System.out.println("第"+(rowIndex+1)+"行，第"+(cellnum+1)+"列  cellType为：Date 值为："+dateFormat.format(date)); 	
	            return dateFormat.format(date);
	        }else{        	 
		        //System.out.println("第"+(rowIndex+1)+"行，第"+(cellnum+1)+"列  cellType为：CELL_TYPE_NUMERIC  值为："+cell.getNumericCellValue()); 	
	        	return cell.getNumericCellValue();
	        } 	      
	    }else if(cell.getCellType() == XSSFCell.CELL_TYPE_BOOLEAN){ 
	    	//System.out.println("第"+(rowIndex+1)+"行，第"+(cellnum+1)+"列  cellType为：CELL_TYPE_BOOLEAN  值为："+cell.getBooleanCellValue()); 
	    	return cell.getBooleanCellValue();
	    }else if(cell.getCellType() == XSSFCell.CELL_TYPE_FORMULA){ 
	    	//System.out.println("第"+(rowIndex+1)+"行，第"+(cellnum+1)+"列  cellType为：CELL_TYPE_FORMULA  值为："+cell.getNumericCellValue()+" 公式为："+cell.getCellFormula());
	    	return cell.getNumericCellValue();
	    }else
	    	return null;
	}