Getting download multiple files in zip format.

Question

Hi
I am trying to read a zip file on c drive and send it for download on clients browser.
My problem is that when I am trying to read zip file form my system drive and copying it(Using NIO) on another location on my drive itself its working fine( working code is attached as Code 1)
but when I try to read zip file in MappedByteBuffer using NIO and append them in a string buffer after converting them to string and get them downloaded at client side, a zip file of same size as that on server is created but it doesn't open up. (Code attached as Code2)
Code1:
package com.pine.test;
import java.io.*;
import java.nio.*;
import java.nio.channels.FileChannel;
class copyFileUsingNIO{
     public static void main (String args[]) throws Exception{
          FileInputStream FIn;
          FileOutputStream FOut;
          FileChannel FIChan, FOChan;
          MappedByteBuffer mBuf;
          long FSize;
          try{
               FIn = new FileInputStream("c:\\Favorites.zip");
               FOut = new FileOutputStream("c:\\outfile_new.zip");
               FIChan = FIn.getChannel();
               FOChan = FOut.getChannel();
               FSize = FIChan.size();
               mBuf = FIChan.map(FileChannel.MapMode.READ_ONLY,0,FSize);
               StringBuffer sb = new StringBuffer();
               //System.out.println(mBuf.limit() + mBuf.toString());
               int len=0;
               byte[] b = new byte[1];
               while(len<mBuf.limit()){                     
                    b[0] = mBuf.get();
                    //System.out.print(b.toString());
                    String s = new String(b,0);
                    System.out.print(s);
                    sb.append(s);
                    //System.out.print(len);
                    len = len+1;
                    //System.out.print(s.toString());
               FOChan.write(mBuf);
               FIChan.close();
               FIn.close();
               FOChan.close();
               FOut.close();
          }catch(IOException ioe){
               System.out.println(ioe);
               System.exit(1);
          }catch(ArrayIndexOutOfBoundsException exc){
               System.out.println(exc.getStackTrace() + " hi");
               //System.exit(1);
//Code 2:-
package com.pine.test;
import java.io.*;
import java.nio.*;
import java.nio.channels.FileChannel;
class copyFileUsingNIO{
     public static void main (String args[]) throws Exception{
          FileInputStream FIn;
          FileOutputStream FOut;
          FileChannel FIChan, FOChan;
          MappedByteBuffer mBuf;
          long FSize;
          try{
               FIn = new FileInputStream("c:\\Favorites.zip");
FIChan = FIn.getChannel();
               FSize = FIChan.size();
               mBuf = FIChan.map(FileChannel.MapMode.READ_ONLY,0,FSize);
               StringBuffer sb = new StringBuffer();
               //System.out.println(mBuf.limit() + mBuf.toString());
               int len=0;
               byte[] b = new byte[1];
               while(len<mBuf.limit()){                     
                    b[0] = mBuf.get();
                    //System.out.print(b.toString());
                    String s = new String(b,0);
                    System.out.print(s);
                    sb.append(s);
                    //System.out.print(len);
                    len = len+1;
                    System.out.print(sb.toString());
               FIChan.close();
               FIn.close();
               FOut.close();
          }catch(IOException ioe){
               System.out.println(ioe);
               System.exit(1);
          }catch(ArrayIndexOutOfBoundsException exc){
               System.out.println(exc.getStackTrace() + " hi");
               //System.exit(1);
Can anyone tell me where I am wrong?
Thanks

Answer 1

but when I try to read zip file in MappedByteBuffer using NIO and append them in a string buffer after converting them to string and get them downloaded at client side, a zip file of same size as that on server is created but it doesn't open upSo don't do it that way.
BIJ001 is correct.