Server

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;


public class Server {
    private static final int PORT = 5000;
    private static final String FILE_NAME = "out.txt";
    private static final int BUFFER_SIZE = 1024;

    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(PORT);

            report("Waiting for connection..");
            Socket connection = serverSocket.accept();

            report("Received connection from " + connection.getInetAddress().getHostName());
            FileOutputStream output = new FileOutputStream(new File(FILE_NAME));
            BufferedInputStream input = new BufferedInputStream(connection.getInputStream());

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

            report("Write finished");

            output.close();
            input.close();
            connection.close();
            serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void report(String message) {
        System.out.println(message);
    }
}