Pre Merge pull request !436 from mpaster/cherry-pick-1759037399

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java

@@ -1003,7 +1003,7 @@ public class ExcelUtil<T>
                 String separator = attr.separator();
                 if (StringUtils.isNotEmpty(dateFormat) && StringUtils.isNotNull(value))
                 {
-                    cell.setCellStyle(createCellStyle(cell.getCellStyle(), dateFormat));
+                    cell.getCellStyle().setDataFormat(this.wb.getCreationHelper().createDataFormat().getFormat(dateFormat));
                     cell.setCellValue(parseDateToStr(dateFormat, value));
                 }
                 else if (StringUtils.isNotEmpty(readConverterExp) && StringUtils.isNotNull(value))
@@ -1033,21 +1033,6 @@ public class ExcelUtil<T>
         return cell;
     }
 
-    /**
-     * 使用自定义格式，同时避免样式污染
-     * 
-     * @param cellStyle 从此样式复制
-     * @param format 格式匹配的字符串
-     * @return 格式化后CellStyle对象
-     */
-    private CellStyle createCellStyle(CellStyle cellStyle, String format)
-    {
-        CellStyle style = wb.createCellStyle();
-        style.cloneStyleFrom(cellStyle);
-        style.setDataFormat(wb.getCreationHelper().createDataFormat().getFormat(format));
-        return style;
-    }
-
     /**
      * 设置 POI XSSFSheet 单元格提示或选择框
      *