Tansfer files through socket

Question

Hi all
Can anyone tell me that how can i send files from server to the client through socket programming.
if u recommend to send file using
int read(byte[] b, int offset, int blength)
void write( byte[] b, int offset, int blength) then how plz tell me how can use these methods to send a receive files??? if u give a small example code then i will very greatful to u.
Usman

Answer 1

Thanks for ur help.
but i have got it. i have designed a client and server. Client requests the server to send a specif file (Client takes the path of file from user). And server sends the file to the client.
I have checked this program on many files. like *.exe, *.txt, *.dat, *.zip, *.mp3, *.jpg.
it worked smoothly. I have test to trasfer a file of 700MB and it worked correctly.
Ooops! i did not check it on Network. i run these program on my own computer. both client and server were running on same computer.
but i am facing a little problem. that is: the speed of trasfering the files is very slow.
any1 know how to increase the speed of data transfer over the sockets ???
And plz tell me how can i trasfer a complete directory just as i trasfered file over the sockets. (Remember: a dircetory may or may not contains may other files and also other directories
thanks in advance...!!!
here is the code:
*          CLIENT            *
import java.net.*;
import java.io.*;
public class TransferClient
    public static void main(String[] args)
        try
             int fileSize = 0;
             int readBytes = 0;     
             final int BUFFER_SIZE = 512;
             byte[] buffer = new byte[BUFFER_SIZE];       
               Socket sockClient = new Socket(InetAddress.getLocalHost(),2000);     
               DataInputStream dataInputStream = new DataInputStream(sockClient.getInputStream());
               BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream("filename.ext"));
               BufferedReader inputUser   = new BufferedReader(new InputStreamReader(System.in)); //For User input
               PrintWriter output = new PrintWriter (sockClient.getOutputStream(), true);     //To send the user input to the server
               //get path from user
               System.out.print("Enter the complete path of file: ");
               String path = inputUser.readLine();
               //send path to server
               output.println(path);
               readBytes = dataInputStream.readInt();
               while(readBytes > 0)
                    readBytes = dataInputStream.read(buffer, 0, readBytes);
                    fileSize = fileSize + readBytes;
                    bufferedOutputStream.write(buffer, 0, readBytes);
                    readBytes = dataInputStream.readInt();
               }//end while
               bufferedOutputStream.flush();
               System.out.println("Received Bytes:  " + fileSize);
               dataInputStream.close();
               bufferedOutputStream.close();                              
               inputUser.close();
               output.close();
               sockClient.close();
        }//end try
        catch(IOException ioException)
             ioException.printStackTrace();
        }//end catch
    }//end main()
}//end class TransferClient
*          SERVER            *
import java.io.*;
import java.net.*;
public class TransferServer
    public static void main(String[] args)
         int fileSize = 0;         
         int readBytes = 0;
         final int BUFFER_SIZE = 512;
         byte[] buffer = new byte[BUFFER_SIZE];
         try
              ServerSocket ss = new ServerSocket(2000);
              System.out.println("Server Strarts...");
              Socket sock = ss.accept();
              BufferedReader clientInput = new BufferedReader(new InputStreamReader (sock.getInputStream()));
               DataOutputStream dataOutputStream = new DataOutputStream(sock.getOutputStream());
               PrintWriter output = new PrintWriter(sock.getOutputStream(), true);
               System.out.println ("Connection Received");          
               String path = clientInput.readLine();               
               File f = new File(path);                    
               if( f.exists() )
                    BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(path));               
                    while((readBytes = bufferedInputStream.read(buffer))!= -1)
                         fileSize = fileSize + readBytes;
                         dataOutputStream.writeInt(readBytes);
                         dataOutputStream.write(buffer, 0, readBytes); 
                    }//end while
                    dataOutputStream.writeInt(0);          
                    System.out.println("Sent Bytes:  " + fileSize);
                    bufferedInputStream.close();
               }//end if
               clientInput.close();
               dataOutputStream.close();
         }//end try
         //catch(FileNotFoundException fileNotFoundException)
         //     output.println("Sorry! file does not exist.");
         catch(IOException ioException)
              ioException.printStackTrace();
         }//end catch       
    }//end main()
}//end class TransferServer