update 优化 ExcelUtil 工具支持合并处理器

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

@@ -2,8 +2,10 @@ package com.ruoyi.common.utils.poi;
 
 import cn.hutool.core.util.IdUtil;
 import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.write.builder.ExcelWriterSheetBuilder;
 import com.alibaba.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
 import com.ruoyi.common.convert.ExcelBigNumberConvert;
+import com.ruoyi.common.excel.CellMergeStrategy;
 import com.ruoyi.common.excel.DefaultExcelListener;
 import com.ruoyi.common.excel.ExcelListener;
 import com.ruoyi.common.excel.ExcelResult;
@@ -69,22 +71,41 @@ public class ExcelUtil {
      *
      * @param list      导出数据集合
      * @param sheetName 工作表的名称
-     * @return 结果
+     * @param clazz     实体类
+     * @param response  响应体
      */
     public static <T> void exportExcel(List<T> list, String sheetName, Class<T> clazz, HttpServletResponse response) {
+        exportExcel(list, sheetName, clazz, false, response);
+    }
+
+    /**
+     * 导出excel
+     *
+     * @param list      导出数据集合
+     * @param sheetName 工作表的名称
+     * @param clazz     实体类
+     * @param merge     是否合并单元格
+     * @param response  响应体
+     */
+    public static <T> void exportExcel(List<T> list, String sheetName, Class<T> clazz, boolean merge, HttpServletResponse response) {
         try {
             String filename = encodingFilename(sheetName);
             response.reset();
             FileUtils.setAttachmentResponseHeader(response, filename);
             response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=UTF-8");
             ServletOutputStream os = response.getOutputStream();
-            EasyExcel.write(os, clazz)
+            ExcelWriterSheetBuilder builder = EasyExcel.write(os, clazz)
                 .autoCloseStream(false)
                 // 自动适配
                 .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
                 // 大数值自动转换 防止失真
                 .registerConverter(new ExcelBigNumberConvert())
-                .sheet(sheetName).doWrite(list);
+                .sheet(sheetName);
+            if (merge) {
+                // 合并处理器
+                builder.registerWriteHandler(new CellMergeStrategy(list, true));
+            }
+            builder.doWrite(list);
         } catch (IOException e) {
             throw new RuntimeException("导出Excel异常");
         }