Client

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;


public class Client {

    private static final String IP = "127.0.0.1";
    private static final int PORT = 5000;
    private static final String FILE_NAME = "input.txt";
    private static final int BUFFER_SIZE = 1024;

    public static void main(String[] args) {
        try {
            Socket socket = new Socket(IP, PORT);
            BufferedOutputStream output = new BufferedOutputStream(
                    socket.getOutputStream());

            File file = new File(FILE_NAME);
            FileInputStream input = new FileInputStream(file);

            byte[] buffer = new byte[BUFFER_SIZE];
            int bytesRead = -1;
            while ((bytesRead = input.read(buffer, 0, buffer.length)) != -1) {
                output.write(buffer, 0, bytesRead);
            }

            input.close();
            output.close();
            socket.close();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}