Download a file in jsp

<%@ page import="java.util.*,java.io.*"%>

<%
   
    File f = new File ("filePahtNeedToDownload"); //read  file name.
    /* set  content type ( word,excel,pdf,txt..etc) here we try for a pdf file */
    response.setContentType ("application/pdf");
    //setting  header and the Name by which user will save the file.
    response.setHeader ("Content-Disposition", "attachment; filename=\"DownloadfileName.pdf\"");
   
    //retrive file name
    String name = f.getName().substring(f.getName().lastIndexOf("/") + 1,f.getName().length());
   
   
        InputStream in = new FileInputStream(f);
        ServletOutputStream outs = response.getOutputStream();
       
       
        int bit = 256;
        int i = 0;
        try {
            while ((bit) >= 0) {
                bit = in.read();
                outs.write(bit);
            }
       
        } catch (IOException ioe) {
            ioe.printStackTrace(System.out);
        }
        outs.flush();
        outs.close();
        in.close();   
%>