URGENT PLEASE HELP WRITING BINARY DATA

Question

I'm attaching a jsp page to download an excel file (generated using HSSF) that doesn't work. When I open t.xls in Excel it looks fine. I think the problem is with out.write.
<%@ page import="java.io.*" %>
<%
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename=output.xl
s");
String fn="/tmp/t.xls";
File fnam=new File(fn);
FileInputStream fis=null;
response.setContentLength((int) fnam.length());
int iRead;
try{
fis= new FileInputStream(fn);
while((iRead=fis.read()) != -1) {
out.write(iRead);
out.flush();
} catch (IOException i) {
out.println("ioexception");
%>

Answer 1

Because there is a newline between the page import line and the <% before the code...
<%@ page import="java.io.*" %><%
response.setContentType("application/vnd.ms-excel");
...