It is hard to suggest the ideal solution when the problem is this
underspecified, but I will stick with the most generic solution:

Open up a Socket to the desired computer and port, take its inputStream,
and then use the write(byte[]) method of said stream to send the data.

If the bandwidth is insufficient, Java has built-in GZIP compression.

300k isn't that large.  I would suggest using an OutputStream, and
simply writing the array to that stream. If you need to break it up into
smaller chunks, OutputStream allows you to do that.

300 KB is not large.

What have you tried ?

It is relative straightforward.

Below is attached a very simple example.

Arne

=================================

import java.io.*;
import java.net.*;

public class Server {
   public static void main(String[] args) throws Exception {
      ServerSocket ss = new ServerSocket(9999);
      Socket s = ss.accept();
      InputStream is = s.getInputStream();
      OutputStream os = new FileOutputStream("C:\\z2.zip");
      byte[] b = new byte[10000];
      int n;
      while((n = is.read(b)) >= 0) {
         os.write(b, 0, n);
      }
      os.close();
      is.close();
   }
}

import java.io.*;
import java.net.*;

public class Client {
   public static void main(String[] args) throws Exception {
      Socket s = new Socket("localhost", 9999);
      OutputStream os = s.getOutputStream();
      InputStream is = new FileInputStream("C:\\z1.zip");
      byte[] b = new byte[10000];
      int n;
      while((n = is.read(b)) >= 0) {
         os.write(b, 0, n);
      }
      os.close();
      is.close();
   }
}

All of the above are good.  A basic socket should work fine.

Have you considered how you will test this?  A basic part of software
design is proper testing.  Testing works best if you design the tests
before you start.

Consider: 100T = 100 b/s = 12,500 bytes per second
300,000 / 12,500 = 24 seconds.

1,000T (giga bit) should be about 2.4 seconds.

You should expect lower numbers (as much as 3 times longer if your
network topology is lacking) but not more than about 3x.  So test to
make sure your number hit this range.  If they don't, try to find out why.

If you're using 10T, it might be faster to burn a CD. ;-)

On Thu, 6 Dec 2007 14:57:11 -0800 (PST), knguyen
<nguyen.h.khanh@gmail.com> wrote, quoted or indirectly quoted someone
who said :

Use a socket and a DataOutputStream.  See
http://mindprod.com/applet/fileio.html for sample code.