<%
    String filename = request.getParameter("f");
    response.setContentType("APPLICATION/OCTET-STREAM");
    response.setHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");

    java.io.FileInputStream fileInputStream = new java.io.FileInputStream(filename);

    int i;
    while ((i = fileInputStream.read()) != -1) {
        out.write(i);
    }
    fileInputStream.close();
%>