NPOI Excel文件下載損壞

我想使用NPOI，angular2和web API將數據從數據表導出爲excel。我所遵循的步驟是：1.將數據從數據表寫入XLSX，並將文件臨時存儲在服務器上。2.將其讀取並寫入內存流並返回。我看到瀏覽器提示用戶下載文件，一旦文件正在下載，我收到一個錯誤，說文件已損壞。但是，在步驟1之後打開服務器上的文件時，文件打開完全正常，通過文件資源管理器下載後打開文件也可以正常工作。您能否幫我理解下載後從瀏覽器打開文件時爲什麼會發生這種情況？NPOI Excel文件下載損壞

網頁API代碼：

public HttpResponseMessage ExportReport(ReportPostModel ReportModel) 
      { 
       try 
       { 
        var dt = _IReportRepositoryObj.ExportToExcel(ReportModel.CommentsToExport, ReportModel.SelectedColumns); 
        var headers = dt.Columns.Cast<DataColumn>().Select(x => x.ColumnName).ToArray(); 
        ICellStyle cellStyle; 
        XSSFWorkbook workbook = new XSSFWorkbook(); 
        cellStyle = workbook.CreateCellStyle(); 
        XSSFFont hFont = (XSSFFont)workbook.CreateFont(); 
        hFont.FontHeightInPoints = 12; 
        hFont.FontName = "Arial"; 

        hFont.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.Bold; 
        cellStyle.SetFont(hFont); 

        var sheet = workbook.CreateSheet("sheet1"); 

        var headerRow = sheet.CreateRow(0); 

        //Create header row 
        for (int i = 0; i < headers.Length; i++) 
        { 
         ICell cell = headerRow.CreateCell(i); 
         cell.SetCellValue(headers[i].ToString()); 
        } 

        //dump data into the excel 
        for (int i = 0; i < dt.Rows.Count; i++) 
        { 
         IRow row = sheet.CreateRow(i + 1); 
         for (int j = 0; j < dt.Columns.Count; j++) 
         { 
          ICell cell = row.CreateCell(j); 
          cell.SetCellValue(dt.Rows[i][headers[j]].ToString()); 
         } 
        } 
        string fileName = "temp" + DateTime.Now.ToString("yyyyMMddHHmmssfff")+ ".xlsx"; 
        string filePath = System.Web.HttpContext.Current.Server.MapPath("~/Temp/"); 
        filePath += fileName; 

        using (FileStream FWriteStream = new FileStream(filePath, FileMode.Create, FileAccess.Write)) 
        { 
         workbook.Write(FWriteStream); 
        } 

        //write excel into memory stream 
        using (var exportData = new MemoryStream()) 
        { 
         using (FileStream FreadStream = new FileStream(filePath, FileMode.Open, FileAccess.Read)) 
         { 
          byte[] bytes = new byte[FreadStream.Length]; 
          FreadStream.Read(bytes, 0, (int)FreadStream.Length); 

          FreadStream.Seek(0, SeekOrigin.Begin); 
          exportData.Write(bytes, 0, (int)FreadStream.Length); 


          HttpResponseMessage message = new HttpResponseMessage(); 
          message.Content = new ByteArrayContent(bytes.ToArray()); 
          message.Content.Headers.Add("x-filename", "temp.xlsx"); 
          message.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); 
          message.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment"); 
          message.Content.Headers.ContentDisposition.FileName = "temp.xlsx"; 
          message.StatusCode = HttpStatusCode.OK; 
          return message; 
         } 
        } 
       } 
       catch (Exception ex) 
       { 
        throw ex; 
       } 

      } 

angular service code: 

    ExportReport(CommentSpecificationModel: any, SelectedColumns: any) { 
      return Observable.create((observer: any) => { 
       debugger; 
       let req = new XMLHttpRequest(); 
       req.open('POST', apiBaseUrl ; 
       let ReportModel = { 
        "CommentsToExport" : CommentSpecificationModel, 
        "SelectedColumns" : SelectedColumns 
       } 


       req.setRequestHeader("Content-Type", "application/json"); 
       req.withCredentials = true; 
       req.responseType = "blob"; 
       req.onreadystatechange = function() { 
        if (req.readyState == 4 && req.status == 200) { 
         debugger; 
         var contentType = req.getResponseHeader("content-type"); 
         var blob = new Blob([req.response], { type: contentType }); 
         observer.next(blob); 
         observer.complete(); 
        } 
       }; 
       req.send(JSON.stringify(ReportModel)); 
      }); 
     }

角度分量代碼：

ExportDatatoExcel() { 
     debugger; 
     this.reportService.ExportSpecificationCommentReport(this.SpecificationCommentsModel, this.SelectedColumns). 
      subscribe((data: any) => { 
       debugger; 
       var link = document.createElement('a'); 
       link.href = window.URL.createObjectURL(data); 
       link.download = "Export.xlsx"; 
       link.click(); 
      } 
      ); 
    }

編輯：

我看到有什麼錯在我使用的代碼，這個問題是在chrome上安裝了mcAfee端點安全性。我如何使我的下載與安全軟件兼容？

來源

2017-10-08 aditya

好了之後，我可以通過在Chrome上禁用Mcaffee插件來使excel下載工作。

來源

2017-10-11 05:39:16 aditya

NPOI Excel文件下載損壞

回答

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