Servlet Streaming file to client: Can't override file name

[Mark Leone]

I wrote a simple servlet that streams a file to the requesting client. 
Everything works fine except I can't figure out how to override the 
filename that Tomcat provides by default to the client for the incoming 
file. The filename presened to the client is the name of the web app.

The HttpServletResponse object that Tomcat passes to the servlet 
provides access to an OutputStream object, and I see no way to set the 
filename with an object of that class. If Tomcat passed a 
FileOutputStream object (child of OutputStream), I could call a 
constructor that sets the file name or file descriptor, but casting the 
OutputStream to a FileOutputStream is not permitted. According to the 
API, the OutputStream object that Tomcat passess to the servlet is 
actually a ServletOutputStream object, which is an abstract child of 
OutputStream. Is there a concrete child of ServletOutputStream that I 
could cast it to, that would let me specify the filename? Is this 
something configurable in Tomcat? Any other way to set the filename?

Here's my servlet code.
package FileSnatcher;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.activation.MimetypesFileTypeMap;
/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2005</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class FileSender extends HttpServlet{
 protected void doGet(HttpServletRequest request,
                      HttpServletResponse response)
     throws ServletException, IOException{
   String file = request.getParameter("file");
   MimetypesFileTypeMap mimeTypes = new MimetypesFileTypeMap
       ("C:\\Program Files\\Java\\jdk1.5.0_01\\lib\\mime.types");
   String mime = mimeTypes.getContentType(new File(file));
   response.setContentType(mime);
   FileInputStream in = new FileInputStream(new File(file));
   OutputStream out = response.getOutputStream();
   byte[] buf = new byte[1024];
   int i = 0;
   while((i=in.read(buf))!=-1) {
     out.write(buf, 0, i);
     }
   in.close();
   out.close();
 }
}
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