easypoi模板导出合并单元格

利用easypoi模板导出，在循环体里合并单元格。数据平铺生成workbook,根据相同值来合并单元格。

 Map mergeMap = new HashMap<>();
 int[] merge = {0};//合并根据列
 int numberOfSheets1 = workbook.getNumberOfSheets();
 for (int k = 0; k < numberOfSheets1; k++) {
      Sheet sheet = workbook.getSheetAt(k);
      Row row = sheet.getRow(1);//表头行
      for (int i = 0; i < row.getLastCellNum(); i++){
           if (i ==4 || i == 5){
               continue;//不需要合并的列
           }
           mergeMap.put(i, merge);
      }
      PoiMergeCellUtil.mergeCells(sheet, mergeMap, 2, sheet.getLastRowNum());
  }