From 156471d638e76f9662c0318bd6ba16280413aaa2 Mon Sep 17 00:00:00 2001
From: RuoYi <yzz_ivy@163.com>
Date: Mon, 09 Mar 2026 15:12:11 +0800
Subject: [PATCH] 优化Excel自定义格式样式重复创建问题
---
ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java | 29 ++++++++++++++++++++++++++++-
1 files changed, 28 insertions(+), 1 deletions(-)
diff --git a/ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java b/ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java
index 8c24343..9489351 100644
--- a/ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java
+++ b/ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java
@@ -80,6 +80,11 @@
public static final String[] FORMULA_STR = { "=", "-", "+", "@" };
/**
+ * 单元格样式缓存
+ */
+ private Map<String, CellStyle> cellStyleCache = new HashMap<String, CellStyle>();
+
+ /**
* Excel sheet最大行数，默认65536
*/
public static final int sheetSize = 65536;
@@ -1003,7 +1008,7 @@
String separator = attr.separator();
if (StringUtils.isNotEmpty(dateFormat) && StringUtils.isNotNull(value))
{
- cell.getCellStyle().setDataFormat(this.wb.getCreationHelper().createDataFormat().getFormat(dateFormat));
+ cell.setCellStyle(createCellStyle(cell.getCellStyle(), dateFormat));
cell.setCellValue(parseDateToStr(dateFormat, value));
}
else if (StringUtils.isNotEmpty(readConverterExp) && StringUtils.isNotNull(value))
@@ -1034,6 +1039,28 @@
}
/**
+ * 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)
+ {
+ String key = cellStyle.getIndex() + "|" + format;
+ CellStyle cached = cellStyleCache.get(key);
+ if (cached != null)
+ {
+ return cached;
+ }
+ CellStyle style = wb.createCellStyle();
+ style.cloneStyleFrom(cellStyle);
+ style.setDataFormat(wb.getCreationHelper().createDataFormat().getFormat(format));
+ cellStyleCache.put(key, style);
+ return style;
+ }
+
+ /**
* 设置 POI XSSFSheet 单元格提示或选择框
*
* @param sheet 表单
--
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