Net Core +swagger+Vue+axios+Npoi导出excel

代码如下：

Net core后台代码：

        public ActionResult ExportData(string condition)
        {
            List models = modelBLL.GetModelList(condition);
 
 
            var workBook = new HSSFWorkbook();
            var sheet = workBook.CreateSheet("导出数据");
             //列宽
            var dic=new Dictionary();

            var headerFont = workBook.CreateFont();
            headerFont.IsBold = true;

            var headerStyle = workBook.CreateCellStyle();
            headerStyle.Alignment = HorizontalAlignment.Center;
            headerStyle.SetFont(headerFont);
            headerStyle.BorderBottom = BorderStyle.Thin;
            headerStyle.BorderLeft = BorderStyle.Thin;
            headerStyle.BorderRight = BorderStyle.Thin;
            headerStyle.BorderTop = BorderStyle.Thin;


            var cellStyle = workBook.CreateCellStyle();
            cellStyle.BorderBottom = BorderStyle.Thin;
            cellStyle.BorderLeft = BorderStyle.Thin;
            cellStyle.BorderRight = BorderStyle.Thin;
            cellStyle.BorderTop = BorderStyle.Thin;


            var rowIndex = 0;
            var row = sheet.CreateRow(rowIndex);
            //设置行高
            row.Height=200*2;
            var cell = row.CreateCell(0);
            cell.SetCellValue("国家编码");
            cell.CellStyle = headerStyle;
            dic.Add(0,Encoding.Default.GetBytes(cell.StringCellValue).Length*256+200);
            cell = row.CreateCell(1);
            cell.SetCellValue("国家名称");
            cell.CellStyle = headerStyle;
            dic.Add(1,Encoding.Default.GetBytes(cell.StringCellValue).Length*256+200);
            cell = row.CreateCell(2);
            cell.SetCellValue("所在州");
            cell.CellStyle = headerStyle;
            dic.Add(2,Encoding.Default.GetBytes(cell.StringCellValue).Length*256+200);

            foreach (Model item in models)
            {
                rowIndex++;
                row = sheet.CreateRow(rowIndex);
                row.Height=200*2;
                cell = row.CreateCell(0);
                cell.SetCellValue(item.country_code);
                cell.CellStyle = cellStyle;
                if(GetColumnWidth(cell)>dic[0])
                {
                    dic[0]=GetColumnWidth(cell);
                }
                cell = row.CreateCell(1);
                cell.SetCellValue(item.country_name);
                cell.CellStyle = cellStyle;
                if(GetColumnWidth(cell)>dic[1])
                {
                    dic[1]=GetColumnWidth(cell);
                }
                cell = row.CreateCell(2);
                cell.SetCellValue(item.state);
                cell.CellStyle = cellStyle;
                if(GetColumnWidth(cell)>dic[2])
                {
                    dic[2]=GetColumnWidth(cell);
                }
            }
            //按照列数设置列宽
            for(int i=0;i<3;i++)
            {
                sheet.SetColumnWidth(i,dic[i]);
            }
 
            byte[] buffer = null;
            using (MemoryStream memoryStream = new MemoryStream())
            {
                workBook.Write(memoryStream);
                buffer = memoryStream.GetBuffer();
                memoryStream.Close();
            }
 
            //这是最重要的部分,返回文件流;test.xlsx可带可不带
            return File(buffer,"application/octet-stream","test.xlsx");
        }

        public int GetColumnWidth(ICell cell)
        {
            int length=Encoding.Default.GetBytes(cell.StringCellValue).Length*256+200;
            length=length>15000?15000:length;
            return length;
        }

js通过axios请求代码：

axios.get('/Controller/ExportData?condition=condition', { responseType: 'blob' })
                .then(function (response) {
                    if (!response) { return; }
                    //最重要一步  new Blob([response.data],{type:response.data.type})
                    var blob = new Blob([response.data],{type:response.data.type});
                    var url=URL.createObjectURL(blob);
                    var link=document.createElement('a');
                    link.style.display="none";
                    link.href=url;
                    link.setAttribute('download','导出数据.xls');
                    document.body.appendChild(link);
                    link.click();
                    document.body.removeChild(link);
                }).catch(function (error) {
                    console.log(error);
                });