Excel file is not download from the directory using Java

Question

In my application, I have an option to download the excel file from the folder by the user, all functions are working well but it shows only the response in the console and I can not download the excel file at the same time the browser does not show the save or download option.

Note : I used all possible ContentType("application/vnd.openxmlformats officedocument.spreadsheetml.sheet").

 String downloadFolder = request.getRealPath(fileDetail.getFilePath()+fileDetail.getFileName());

    Path file = Paths.get(downloadFolder);
    if(Files.exists(file)){
        response.reset();
        response.setContentType("application/vnd.openxmlformats officedocument.spreadsheetml.sheet");
        response.setHeader("Content-Disposition", "attachment; filename=\"Demo.xlsx");

        try {
            Files.copy(file, response.getOutputStream());
            response.getOutputStream().flush();
        } catch (IOException e){
            return null;
        }
    }

How can I solve this problem? I need to download the excel file when the method is called.Thank you

Answer 1

You can try writing the file as belows

InputStream inputStream = new BufferedInputStream(new FileInputStream(file));

  //Copy bytes from source to destination(outputstream in this example), closes both streams.

  FileCopyUtils.copy(inputStream, response.getOutputStream());

Answer 2

Try this for downloading file

protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");


     response.setHeader("Content-disposition","attachment; filename=check.xlsx"); // Used to name the download file and its format

     File my_file = new File("E://outputtext.xlsx"); // We are downloading .xlsx file, in the format of doc with name check - check.xlsx


     OutputStream out = response.getOutputStream();
     FileInputStream in = new FileInputStream(my_file);
     byte[] buffer = new byte[4096];
     int length;
     while ((length = in.read(buffer)) > 0){
        out.write(buffer, 0, length);
     }
     in.close();
     out.flush();
}

Answer 3

I guess since the flush() is invoked in the consective step . It is not working properly.

Try to use finally block to flush..