数据报表销量导出修改

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

@@ -32,9 +32,11 @@ import java.io.*;
 import java.security.MessageDigest;
 import java.text.DecimalFormat;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ConcurrentLinkedQueue;
 
 /**
  * File工具类，扩展 hutool 工具包
@@ -231,6 +233,36 @@ public class FileUtil extends cn.hutool.core.io.FileUtil {
         IoUtil.close(out);
     }
 
+    public static void downloadExcelAndMerge(ConcurrentLinkedQueue<Map<String, Object>> list, int colSize, HttpServletResponse response, ArrayList<Integer> mergeRowIndex) throws IOException {
+        String tempPath = SYS_TEM_DIR + IdUtil.fastSimpleUUID() + ".xlsx";
+        File file = new File(tempPath);
+        BigExcelWriter writer = ExcelUtil.getBigWriter(file);
+
+        // 合并单元格后的标题行，使用默认标题样式.
+        for (int i = 0; i < mergeRowIndex.size(); i++) {
+            for (int i1 = 0; i1 < colSize; i1++) {
+                writer.merge(i == 0 ? 0 : mergeRowIndex.get(i - 1) + 1, mergeRowIndex.get(i), i1, i1, "", true);
+            }
+        }
+        // 一次性写出内容，使用默认样式，强制输出标题
+        writer.write(list, true);
+        SXSSFSheet sheet = (SXSSFSheet)writer.getSheet();
+        //上面需要强转SXSSFSheet  不然没有trackAllColumnsForAutoSizing方法
+        sheet.trackAllColumnsForAutoSizing();
+        //列宽自适应
+        writer.autoSizeColumnAll();
+        //response为HttpServletResponse对象
+        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
+        //test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码
+        response.setHeader("Content-Disposition", "attachment;filename=file.xlsx");
+        ServletOutputStream out = response.getOutputStream();
+        // 终止后删除临时文件
+        file.deleteOnExit();
+        writer.flush(out, true);
+        //此处记得关闭输出Servlet流
+        IoUtil.close(out);
+    }
+
     public static String getFileType(String type) {
         String documents = "txt doc pdf ppt pps xlsx xls docx";
         String music = "mp3 wav wma mpa ram ra aac aif m4a";
@@ -353,4 +385,6 @@ public class FileUtil extends cn.hutool.core.io.FileUtil {
     public static String getMd5(File file) {
         return getMd5(getByte(file));
     }
+
+
 }