如何在CSVdownload中抑制文件损坏警告？

Question

我有一个链接到Excel 2007工作表的网页。它是.xlsx文件中的上传详细信息，并以.csv文件下载。当我点击下载链接并尝试打开时，我会得到通常的对话框来打开/保存Excel文件。点击＆＃39;打开＆＃39;，我收到以下警告信息 -

  

您要打开的文件，＆＃39; filename.csv＆＃39;格式与文件扩展名指定的格式不同。在打开文件之前，请验证文件是否已损坏且是否来自受信任的源。你想现在打开文件吗？

我用Java开发了这段代码

private void downloadExcelSheet(HSSFWorkbook workbook, String sheetName){
    OutputStream out = null;
    try{

        ByteArrayOutputStream outByteStream = new ByteArrayOutputStream();
        workbook.write(outByteStream);
        byte[] bytes = outByteStream.toByteArray(); //workbook.getBytes()
        HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();

        response.reset();
        String disHeader = "Attachment;Filename=\""+sheetName+".csv\"";
        response.addHeader("Content-Disposition", disHeader);
        response.setContentType("text/csv");
        //response.setHeader("Content-Disposition", "attachment; filename=\""+sheetName+".csv");
        //response.setContentType("text/csv");
        response.setContentLength(bytes.length);
        out = response.getOutputStream();
        out.write(bytes);
        out.flush();

    }catch(IOException ioe){
        ioe.printStackTrace();
    }
    catch(Exception e){
        e.printStackTrace();
    }
    finally{
        try{
            if(out!=null){
                out.close();
            }
        }catch(IOException io){
            io.printStackTrace();
        }
    }
}