使用Apache POI从Excel获取单元格的日期值Java

Question

我试图从excel文件中读取一切正常的单元格值。但是当涉及公式时，特别是日期字段，我无法获取任何日期值。

我如何检查中评价的CellValue日期类型？以及如何获取日期值？

我的代码如下。

Cell cell = nextRow.getCell(cellIndex, Row.CREATE_NULL_AS_BLANK); 
if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) { 
    FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator(); 
    CellValue formulaValue = evaluator.evaluate(cell); 
    switch (formulaValue.getCellType()) { 
     case Cell.CELL_TYPE_NUMERIC: { 
      int numbericValue = formulaValue.getNumericValue(); // 42909.0 
      if (isCellDate?) { //What should i check here? 
       // DATE THINGS 
       // how to convert numeric value 42909.0 to date?? 
      } else { 
       // NUMERIC THINGS 
      } 
      break; 
     } 
     default: 
      // STRING - ERROR - BLANK - NUMERIC THINGS 
      break; 
    } 
} 

Answer 1

HSSFDateUtil : Helped to solve my issue. my solution is : 

case Cell.CELL_TYPE_NUMERIC: { 
if (HSSFDateUtil.isCellDateFormatted(cell)) { 
    Date date = HSSFDateUtil.getJavaDate(formulaValue.getNumberValue()); 
    System.out.println(date); 
} else { 
    System.out.println(cell.getNumericCellValue()); 
} 
break; 

}