File Download - new Problem

Hi java guru's
I'm trying to write a download pgm using servlet and JSP. The actual problem is, when i'm trying to download a file, the output stream writes all the comtent of the file on the browser itself even if it's a .exe file instead of opening a "Save as" dialog box
Can you guru's suggest me a best way to overcome this problem!
Thanks in advance

Hello friends,
We can download any files in two ways
1. calling java script function
2. read/write operation(io).
Both codes are working fine. try it and if u face any problem.Please let me know,
Friendly,
Jawahar
bangalore. India
[email protected]
=================================
java script code
==============================
<%

String path ="/jsp/xxx.xls";

String fileName="xxx.xls";
%>
<html>
<head>
<title>Down load forms</title>
</head>
<body onLoad="window.open('<%=path%>');">
<table border="0" align="center" width="100%">
<tr><td height="181"><font face="verdana" color="#5599cc" size="2" align="center">you have selected the file <%=fileName%</font> </td></tr> </table></body></html>
==========================================
Read/write IO operation is here
==========================================
<%
String files = null;
String fileName=null;

String file=".... any path";
File f = new File(file);
FileInputStream in = new FileInputStream(f);
int length = (int)f.length();
if(length != 0)
byte[] buf = new byte[length];
ServletOutputStream op = response.getOutputStream();
response.setContentType ("application/octet-stream");
response.setHeader("Content-Disposition", "attachment; filename=\""+fileName+"\"");
while ((in != null) && ((length = in.read(buf)) != -1))
System.out.println("BUFFER $"+buf.length+"$");
System.out.println("Bytes read in: " + Integer.toString(length));
op.write(buf,0, buf.length);
op.close();
%>
<%@ page import="java.io.*,javax.servlet.*,java.util.*,java.sql.* " contentType="text/html" %>
<html>
<head>
<title>Welcome to the download form page</title>
</head>
<body bgcolor=#FFFFFF>
==========================================

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