code: public StyleSet setAlign(HorizontalAlignment halign, VerticalAlignment valign) {
  		StyleUtil.setAlign(this.headCellStyle, halign, valign);
  		StyleUtil.setAlign(this.cellStyle, halign, valign);
  		StyleUtil.setAlign(this.cellStyleForNumber, halign, valign);
  		StyleUtil.setAlign(this.cellStyleForDate, halign, valign);
  		return this;
  	}
docs: 设置cell文本对齐样式
  
  @param halign 横向位置
  @param valign 纵向位置
  @return this
  @since 4.0.0