forçar download de arquivo text no Internet Explorer

File _file = new File( file);
        response.setHeader( "Pragma ", "public ");
        response.setHeader( "Expires ", "0 ");
        response.setHeader("Cache-Control ", "must-revalidate, post-check=0, pre-check=0 ");
        response.setContentType( "application/octet-stream" );
        response.setHeader( "Content-Disposition ", "attachment; filename=\""+_file.getName()+ "\"; ");
        response.setHeader( "Content-transfer-encoding ", "binary ");
        response.setContentLength((int)_file.length());
       
        try {
            PrintWriter out = response.getWriter();
            FileInputStream fileInputStream = new FileInputStream(_file);
            int i;
            while ((i=fileInputStream.read())!=-1) {
                out.write(i);
            }
            out.flush();
            out.close();           
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }