From 156471d638e76f9662c0318bd6ba16280413aaa2 Mon Sep 17 00:00:00 2001
From: RuoYi <yzz_ivy@163.com>
Date: Mon, 9 Mar 2026 15:12:11 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96Excel=E8=87=AA=E5=AE=9A?=
 =?UTF-8?q?=E4=B9=89=E6=A0=BC=E5=BC=8F=E6=A0=B7=E5=BC=8F=E9=87=8D=E5=A4=8D?=
 =?UTF-8?q?=E5=88=9B=E5=BB=BA=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 .../com/ruoyi/common/core/utils/poi/ExcelUtil.java   | 12 ++++++++++++
 1 file changed, 12 insertions(+)

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 c2be4c635..948935157 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
@@ -79,6 +79,11 @@ public class ExcelUtil<T>
 
     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
      */
@@ -1042,9 +1047,16 @@ public class ExcelUtil<T>
      */
     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;
     }