Excel通过Java Servlet下载

Question

I have a requirement of downloading excel sheet(HSSF workbook). In the response , I have set the content type and header as

response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-Disposition",
                "attachment; filename=user.xls");
        OutputStream out = response.getOutputStream();
        workBook.write(out);

When ever i click the button, it is calling the servlet but the excel is not getting downloaded. In alert I'm getting the response like

??????????????????????????????????????????? Root ???? Entry WorkBook ???????????????????????????????????????????????????????????????????????

Suggest me any ideas to resolve the issue. Thanks in advance.

Answer 1

Try to specify the mime type. For example:

response.setContentType("application/octet-stream");

For a more general solution try to use this:

    String mimeType = URLConnection
            .guessContentTypeFromName(file.getName());
    if (mimeType == null) {
        mimeType = "application/octet-stream";
    }

    response.setContentType(mimeType);