New to Java

Hi

I have written a simple code to generate a excel workbook from servlet using Apache POI.
But here I have to hardcode the excel name and path to be saved.

<%@ page import="org.apache.poi.hssf.usermodel.HSSFSheet"%>
<%@ page import="org.apache.poi.hssf.usermodel.HSSFWorkbook"%>
<%@ page import="org.apache.poi.poifs.filesystem.POIFSFileSystem"%>
<%@ page contentType="application/vnd.ms-excel" %>
<%@ page import="java.io.*" %>
<%
try{
   POIFSFileSystem fs=new POIFSFileSystem(new FileInputStream
("c:\\excel\\rajesh1.xls"));
    HSSFWorkbook wb=new HSSFWorkbook(fs);
    FileOutputStream fileOut = new FileOutputStream(
"c:\\excel\\readingWriting.xls");
    wb.write(fileOut);
    fileOut.close();
      out.println("Your excel file has been generated");
            
        } catch ( Exception ex ) {       
        }
%>

But I have seen in web sites that if u wish to download an excel sheet, then on clicking on download link,
we get a pop-up which asks to save, view or cancel action.
If we choose save, a dialogue box appears where we can select path and give a name for our file.

How is this possible in my code above