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 | 45 ++++++++++++++++++++++++++++++++++++++-------
1 files changed, 38 insertions(+), 7 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 edaa1c7..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;
@@ -147,12 +152,12 @@
/**
* 对象的子列表方法
*/
- private Map<String, Method> subMethods = new HashMap<>();
+ private Map<String, Method> subMethods;
/**
* 对象的子列表属性
*/
- private Map<String, List<Field>> subFieldsMap = new HashMap<>();
+ private Map<String, List<Field>> subFieldsMap;
/**
* 统计列表
@@ -225,7 +230,10 @@
int titleLastCol = this.fields.size() - 1;
if (isSubList())
{
- titleLastCol = titleLastCol + subFieldsMap.values().size() - 1;
+ for (List<Field> currentSubFields : subFieldsMap.values())
+ {
+ titleLastCol = titleLastCol + currentSubFields.size() - 1;
+ }
}
Row titleRow = sheet.createRow(rownum == 0 ? rownum++ : 0);
titleRow.setHeightInPoints(30);
@@ -587,7 +595,6 @@
* 填充excel数据
*
* @param index 序号
- * @param row 单元格行
*/
@SuppressWarnings("unchecked")
public void fillExcelData(int index)
@@ -611,10 +618,10 @@
try
{
Collection<?> subList = (Collection<?>) getTargetValue(vo, field, excel);
+ List<Field> currentSubFields = subFieldsMap.get(field.getName());
if (subList != null && !subList.isEmpty())
{
int subIndex = 0;
- List<Field> currentSubFields = subFieldsMap.get(field.getName());
for (Object subVo : subList)
{
Row subRow = sheet.getRow(currentRowNum + subIndex);
@@ -631,8 +638,8 @@
}
subIndex++;
}
- column += currentSubFields.size();
}
+ column += currentSubFields.size();
}
catch (Exception e)
{
@@ -1001,7 +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))
@@ -1029,6 +1036,28 @@
log.error("导出Excel失败{}", e);
}
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)
+ {
+ 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;
}
/**
@@ -1349,6 +1378,8 @@
{
List<Object[]> fields = new ArrayList<Object[]>();
List<Field> tempFields = new ArrayList<>();
+ subFieldsMap = new HashMap<>();
+ subMethods = new HashMap<>();
tempFields.addAll(Arrays.asList(clazz.getSuperclass().getDeclaredFields()));
tempFields.addAll(Arrays.asList(clazz.getDeclaredFields()));
if (StringUtils.isNotEmpty(includeFields))
--
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