code: public static CellStyle createDefaultCellStyle(Workbook workbook) {
  		final CellStyle cellStyle = workbook.createCellStyle();
  		setAlign(cellStyle, HorizontalAlignment.CENTER, VerticalAlignment.CENTER);
  		setBorder(cellStyle, BorderStyle.THIN, IndexedColors.BLACK);
  		return cellStyle;
  	}
docs: 创建默认普通单元格样式
  
  <pre>
  1. 文字上下左右居中
  2. 细边框，黑色
  </pre>
  
  @param workbook {@link Workbook} 工作簿
  @return {@link CellStyle}