poi导入excel 单元格类型及转换

private String getCellValue(HSSFCell cell) {
        String cellValue = "";
        DecimalFormat df = new DecimalFormat("#");
        switch (cell.getCellType()) {
        case HSSFCell.CELL_TYPE_STRING:
            cellValue = cell.getRichStringCellValue().getString().trim();
            break;
        case HSSFCell.CELL_TYPE_NUMERIC:
            cellValue = df.format(cell.getNumericCellValue()).toString();
            break;
        case HSSFCell.CELL_TYPE_BOOLEAN:
            cellValue = String.valueOf(cell.getBooleanCellValue()).trim();
            break;
        case HSSFCell.CELL_TYPE_FORMULA:
            cellValue = cell.getCellFormula();
            break;
        default:
            cellValue = "";
        }
        return cellValue;
    }