From 7a112c7317e9f0e55c4ca86b14533c84448ee0d9 Mon Sep 17 00:00:00 2001
From: RuoYi <yzz_ivy@163.com>
Date: Mon, 21 Nov 2022 12:32:09 +0800
Subject: [PATCH] =?UTF-8?q?=E5=85=BC=E5=AE=B9Excel=E4=B8=8B=E6=8B=89?=
 =?UTF-8?q?=E6=A1=86=E5=86=85=E5=AE=B9=E8=BF=87=E5=A4=9A=E6=97=A0=E6=B3=95?=
 =?UTF-8?q?=E6=98=BE=E7=A4=BA=E7=9A=84=E9=97=AE=E9=A2=98?=
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---
 .../common/core/utils/poi/ExcelUtil.java      | 65 ++++++++++++++++++-
 1 file changed, 63 insertions(+), 2 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 2d64b2294..05ce1b76f 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
@@ -37,6 +37,7 @@ import org.apache.poi.ss.usermodel.FillPatternType;
 import org.apache.poi.ss.usermodel.Font;
 import org.apache.poi.ss.usermodel.HorizontalAlignment;
 import org.apache.poi.ss.usermodel.IndexedColors;
+import org.apache.poi.ss.usermodel.Name;
 import org.apache.poi.ss.usermodel.Row;
 import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.usermodel.VerticalAlignment;
@@ -855,8 +856,16 @@ public class ExcelUtil<T>
         }
         if (StringUtils.isNotEmpty(attr.prompt()) || attr.combo().length > 0)
         {
-            // 提示信息或只能选择不能输入的列内容.
-            setPromptOrValidation(sheet, attr.combo(), attr.prompt(), 1, 100, column, column);
+            if (attr.combo().length > 15 || StringUtils.join(attr.combo()).length() > 255)
+            {
+                // 如果下拉数大于15或字符串长度大于255，则使用一个新sheet存储，避免生成的模板下拉值获取不到
+                setXSSFValidationWithHidden(sheet, attr.combo(), attr.prompt(), 1, 100, column, column);
+            }
+            else
+            {
+                // 提示信息或只能选择不能输入的列内容.
+                setPromptOrValidation(sheet, attr.combo(), attr.prompt(), 1, 100, column, column);
+            }
         }
     }
 
@@ -955,6 +964,58 @@ public class ExcelUtil<T>
         sheet.addValidationData(dataValidation);
     }
 
+    /**
+     * 设置某些列的值只能输入预制的数据,显示下拉框（兼容超出一定数量的下拉框）.
+     * 
+     * @param sheet 要设置的sheet.
+     * @param textlist 下拉框显示的内容
+     * @param promptContent 提示内容
+     * @param firstRow 开始行
+     * @param endRow 结束行
+     * @param firstCol 开始列
+     * @param endCol 结束列
+     */
+    public void setXSSFValidationWithHidden(Sheet sheet, String[] textlist, String promptContent, int firstRow, int endRow, int firstCol, int endCol)
+    {
+        String hideSheetName = "combo_" + firstCol + "_" + endCol;
+        Sheet hideSheet = wb.createSheet(hideSheetName); // 用于存储 下拉菜单数据
+        for (int i = 0; i < textlist.length; i++)
+        {
+            hideSheet.createRow(i).createCell(0).setCellValue(textlist[i]);
+        }
+        // 创建名称，可被其他单元格引用
+        Name name = wb.createName();
+        name.setNameName(hideSheetName + "_data");
+        name.setRefersToFormula(hideSheetName + "!$A$1:$A$" + textlist.length);
+        DataValidationHelper helper = sheet.getDataValidationHelper();
+        // 加载下拉列表内容
+        DataValidationConstraint constraint = helper.createFormulaListConstraint(hideSheetName + "_data");
+        // 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
+        CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
+        // 数据有效性对象
+        DataValidation dataValidation = helper.createValidation(constraint, regions);
+        if (StringUtils.isNotEmpty(promptContent))
+        {
+            // 如果设置了提示信息则鼠标放上去提示
+            dataValidation.createPromptBox("", promptContent);
+            dataValidation.setShowPromptBox(true);
+        }
+        // 处理Excel兼容性问题
+        if (dataValidation instanceof XSSFDataValidation)
+        {
+            dataValidation.setSuppressDropDownArrow(true);
+            dataValidation.setShowErrorBox(true);
+        }
+        else
+        {
+            dataValidation.setSuppressDropDownArrow(false);
+        }
+
+        sheet.addValidationData(dataValidation);
+        // 设置hiddenSheet隐藏
+        wb.setSheetHidden(wb.getSheetIndex(hideSheet), true);
+    }
+
     /**
      * 解析导出值 0=男,1=女,2=未知
      *