Hello,

i am relatively new to java, but i have a large amount of experience in C++
so the transition hasn't been too bad.
I am currently trying to build an application bit by bit so i am learning as
much as i can.
In the end i want an application that transfers XML files (via and HTTP
which will be good for debugging), but for the moment i am trying to build
one that just sends any file.

I have set up the appropriate code on each machine, sending a file from a
client to a server. However i am having problems with sockets.
I can send the file successfully but i would like the server to return some
acknowledgement, then i can figure out how to send another file etc.
I have tried sending a string but it doesn't work... can someone help?
Eventually i would like to send multiple files sequentially so i do need
some sort of acknowledgement even thought i am using tcp.
Im also having trouble with the naming of a file. If i send a file from the
client and want to save the file anywhere on the server, i need the file
name from the client. Can i extract it from the input stream or do i need to
request it separately?

My code for both sections is below:

Client code
-------------------------------------------------------------------------------------------------------
import java.io.*;
import java.net.*;

public class TCPClientfile
{

public static void main(String[] args) throws Exception
{

       Socket clientSocket = new Socket(host address and port);

       OutputStream dataOutput = clientSocket.getOutputStream();
       File inputFile = new File("readme_eclipse.html"); // example file to
send
       FileInputStream in = new FileInputStream(inputFile);

       byte[] buffer = new byte[2048];
       int numread;

       while ((numread = in.read(buffer))>=0)
        {
        dataOutput.write(buffer,0,numread);
        System.out.println("sending..." +numread); // console confirmation
of transfer
        }
      // if i de-comment the next section things dont work

     /*  BufferedReader inFromServer  =new BufferedReader(new
InputStreamReader(clientSocket.getInputStream()));

       modifiedSentence = inFromServer.readLine();

       System.out.println("FROM SERVER: " + modifiedSentence);
       */
       inFromServer.close();
       in.close();
       dataOutput.close();
       clientSocket.close();
   }
}
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Server code

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

import java.io.*;
import java.net.*;
public class TCPServerfile
{

public static void main(String[] args) throws Exception
{

      ServerSocket welcomeSocket = new ServerSocket(port number);
      System.out.println("listening");

           Socket connectionSocket = welcomeSocket.accept();
           System.out.println("socket accepted");
           InputStream dataInput = connectionSocket.getInputStream();

           File outputfile = new File ("readme_eclipse2.html"); // renamed
file from client, but how to get the original name?
           FileOutputStream out = new FileOutputStream(outputfile);

           byte[] buffer = new byte[2048];
           int numbread;

           while((numbread = dataInput.read(buffer))>=0)
             {
              out.write(buffer, 0, numbread);
              System.out.println("Receiving..." + numbread);
             }
           // code will hang here if i try to send string as commented
below

          /* DataOutputStream  outToClient = new
DataOutputStream(connectionSocket.getOutputStream());

           outToClient.writeBytes(Response);
           System.out.println(Response);
           */
           outToClient.close();
           out.close();
           dataInput.close();
           connectionSocket.close();
           welcomeSocket.close();

}
}
-------------------------------------------------------------------------------------------------------------------------------------

Can anyone offer me any corrections, advice.... good texts to read that
would help me at all?

Cheers!!

Phillip Ferguson

MEng student strathclyde university