导出方法

eladmin-common/src/main/java/cn/ysk/cashier/utils/FileUtil.java

@@ -223,6 +223,51 @@ public class FileUtil extends cn.hutool.core.io.FileUtil {
         IoUtil.close(out);
     }
 
+    public static void downloadAndMergeExcel(List<Map<String, Object>> list, List<List<Integer>> mergeData, List<String> keyList, HttpServletResponse response) throws IOException {
+        String tempPath = SYS_TEM_DIR + IdUtil.fastSimpleUUID() + ".xlsx";
+
+        // 创建工作簿
+        Workbook workbook = new XSSFWorkbook();
+        // 创建工作表
+        Sheet sheet = workbook.createSheet("Sheet1");
+
+        // 合并单元格，从第 0 行第 0 列到第 0 行第 2 列
+//        sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 2));
+
+        for (List<Integer> mergeDatum : mergeData) {
+            sheet.addMergedRegion(new CellRangeAddress(mergeDatum.get(0), mergeDatum.get(1), mergeDatum.get(2), mergeDatum.get(3)));
+        }
+
+        Row row0 = sheet.createRow(0);
+        for (int i = 0; i < keyList.size(); i++) {
+            Cell cell = row0.createCell(i);
+            cell.setCellValue(keyList.get(i));
+        }
+        for (int i = 0; i < list.size(); i++) {
+            Map<String, Object> map = list.get(i);
+            Row row = sheet.createRow(i + 1);
+            for (int j = 0; j < keyList.size(); j++) {
+                Cell cell = row.createCell(j);
+                cell.setCellValue(map.get(keyList.get(j)) == null ? "" : map.get(keyList.get(j)).toString());
+            }
+        }
+
+        // response为HttpServletResponse对象
+        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
+        response.setHeader("Content-Disposition", "attachment;filename=file.xlsx");
+
+        try (FileOutputStream outputStream = new FileOutputStream(tempPath);
+             ServletOutputStream out = response.getOutputStream()) {
+
+            workbook.write(outputStream);
+            workbook.write(out);
+        } catch (IOException e) {
+            // 更详细的错误处理
+            e.printStackTrace();
+            // 可以考虑返回一个错误响应给客户端
+        }
+    }
+
     /**
      * 输入标题到excel
      *