How to read from excel file and write it using implicit jsp out object

Question

our code is as below:Please give us proper solution.
we are reading from Excel file and writing in dynamicaly generated Excel file.it is writing but not as original excel sheet.we are using response.setContentType and response.setHeader for generating pop up for saveing the original file in to dynamically generated Excel file.
<%@ page contentType="application/vnd.ms-excel" %>
<%     
     //String dLoadFile = (String)request.getParameter("jspname1");
     String dLoadFile = "c:/purge_trns_nav.xls" ;
     File f = new File(dLoadFile);
     //set the content type(can be excel/word/powerpoint etc..)
     response.setContentType ("application/msexcel");
     //get the file name
     String name = f.getName().substring(f.getName().lastIndexOf("/") + 1,f.getName().length());
     //set the header and also the Name by which user will be prompted to save
     response.setHeader ("Content-Disposition", "attachment;     filename="+name);
     //OPen an input stream to the file and post the file contents thru the
     //servlet output stream to the client m/c
          FileInputStream in = new FileInputStream(f);
          //ServletOutputStream outs = response.getOutputStream();
          int bit = 10;
          int i = 0;
          try {
                    while (bit >= 0) {
                    bit = in.read();
                    out.write(bit) ;
} catch (IOException ioe) { ioe.printStackTrace(System.out); }
          out.flush();
out.close();
in.close();     
%>

Answer 1

If you want to copy files as fast as possible, without processing them (as the DOS "copy" or the Unix "cp" command), you can try the java.nio.channels package.
import java.nio.*;
import java.nio.channels.*;
import java.io.*;
import java.util.*;
import java.text.*;
class Kopy {
     * @param args [0] = source filename
     *        args [1] = destination filename
    public static void main(String[] args) throws Exception {
        if (args.length != 2) {
            System.err.println ("Syntax: java -cp . Kopy source destination");
            System.exit(1);
        File in = new File(args[0]);
        long fileLength = in.length();
        long t = System.currentTimeMillis();
        FileInputStream fis = new FileInputStream (in);
        FileOutputStream fos = new FileOutputStream (args[1]);
        FileChannel fci = fis.getChannel();
        FileChannel fco = fos.getChannel();
        fco.transferFrom(fci, 0, fileLength);
        fis.close();
        fos.close();
        t = System.currentTimeMillis() - t;
        NumberFormat nf = new DecimalFormat("#,##0.00");
        System.out.print (nf.format(fileLength/1024.0) + "kB copied");
        if (t > 0) {
            System.out.println (" in " + t + "ms: " + nf.format(fileLength / 1.024 / t) + " kB/s");
}