JSP, downloading files and show html page

I like to download files and show a html page on JSP.
With the source following, downloading works well.
But, it is just remained on the previous page, not showing the next html page.
Someone tell me why is it?
<%@ page import="java.io.*, java.net.URL"%><%
String file_name = request.getParameter("file_name");
File fileDir = new File(config.getServletContext().getRealPath("upload/"));
File theFile = new File(fileDir, file_name);
FileInputStream fin = new FileInputStream(theFile);
response.setHeader("Content-Disposition","attachment; filename=\"" + theFile.getName()+"\"");
response.setContentLength((int) theFile.length());
BufferedInputStream bf = new BufferedInputStream(new FileInputStream(theFile), 8096);
int i;
while ((i=bf.read()) != -1)
out.write(i);
bf.close();
out.close();
%>
<html>
<head>
<title>file download</title>
</head>
<body>
 
You have
successfully downloaded your file(<%=file_name%>)!
</body>
</html>

You's already close the JSP output stream befor you try and write your html confirmation, and I don't think browsers can provide the kind of functionality you're trying to demonstrate here. A browser will download the file and open it directly itself or using another application based on user input (e.g. save as, open file, etc.). Once the file is opened or downloaded, it's done!
I think your best bet is to show a dialogue that the user's download should begin, then set the pages href w/ JS to the location of the file, same way other sites that allow you to download files do it. Go take a look at download.com or something like that.
Hope that helps.

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