Java Programming

So I am trying to write an FTP server and client. I believe that I almost have it, but I think that I am missing something with sending the file. If I try to send a file over FTP, it will pop up at the server side, but the file will be empty. I think that I am not doing my I/O right...if anyone has any suggestions or examples about how to get my file I/O right that would be very helpful.

FTP Server:

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

public class FtpServer {
	
	public static void main(String[] args) {
		
		int i = 1;
		System.out.println("******************************************************************************");
		System.out.println("********************************* FTP SERVER *********************************");
		System.out.println("******************************************************************************");
		
		try {
			ServerSocket s = new ServerSocket(100);
			System.out.println("Server Started...");
			System.out.println("Waiting for connections...\n");
			for (;;) {
				Socket incoming = s.accept();
				System.out.println("New Client Connected with id " + i + " from " + incoming.getInetAddress().getHostName() + "...");
				Thread t = new ThreadedServer(incoming, i);
				i++;
				t.start();
			}
		} catch (Exception e) {
			System.out.println("Error: " + e);
		}
	}
}

class ThreadedServer extends Thread {
	int n;
	String c, fn, fc;
	String filenm;
	Socket incoming;
	int counter;
	String dirn = "C:/FTP-ROOT";

	public ThreadedServer(Socket i, int c) {
		incoming = i;
		counter = c;
	}

	public void run() {
		try {

			BufferedReader in = new BufferedReader(new InputStreamReader(incoming.getInputStream()));
			OutputStream output = incoming.getOutputStream();
			fn = in.readLine();
			c = fn.substring(0, 1);

			if (c.equals("#")) {
				n = fn.lastIndexOf("#");
				filenm = fn.substring(1, n);
				FileInputStream fis = null;
				boolean filexists = true;
				System.out.println("Request to download file \"" + filenm + "\" recieved from " + incoming.getInetAddress().getHostName() + "...");
				try {
					fis = new FileInputStream(filenm);
				} catch (FileNotFoundException exc) {
					filexists = false;
					System.out.println("FileNotFoundException:<BR>" + exc.getMessage());
				}
				if (filexists) {
					sendBytes(fis, output);
					fis.close();
				}
			} else {
				try {
					boolean done = true;
					System.out.println("Request to upload file \"" + fn + "\" recieved from " + incoming.getInetAddress().getHostName() + "...");
					File dir = new File(dirn);
					if (!dir.exists()) {
						dir.mkdir();
					} else {
					}
					File f = new File(dir, fn);
					FileOutputStream fos = new FileOutputStream(f);
					DataOutputStream dops = new DataOutputStream(fos);

					while (done) {
						fc = in.readLine();
						if (fc == null) {
							done = false;
						} else {
							dops.writeChars(fc);
						}
					}
					fos.close();
				} catch (Exception ecc) {
					System.out.println(ecc.getMessage());
				}
			}
			incoming.close();
		} catch (Exception e) {
			System.out.println("Error: " + e);
		}
	}

	private static void sendBytes(FileInputStream f, OutputStream op)
			throws Exception {
		byte[] buffer = new byte[1024];
		int bytes = 0;
		while ((bytes = f.read(buffer)) != -1) {
			op.write(buffer, 0, bytes);
		}
	}

}

FTP Client:

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

public class ftp_client {

	public static void main(final String args[]) {

		String server_ip;
		String file;
		String fn, filenm;
		String fc;
		String dirn = "c:/FTP CLIENT DIRECTORY";

		Socket s;
		InputStreamReader in;
		OutputStream out = null;
		BufferedReader br;
		PrintWriter pw = null;

		while (true) {
			System.out.print("FTP Server Address: ");
			server_ip = data_read();

			try {
				s = new Socket(server_ip, 100);
				br = new BufferedReader(new InputStreamReader(s
						.getInputStream()));
				pw = new PrintWriter(s.getOutputStream(), true);
				out = s.getOutputStream();
			} catch (final Exception e) {
				System.out.println("ERROR : Coult not connect to the server \"" + server_ip + "\"");
				break;
			}

			System.out.print("File to upload: ");
			file = data_read();

			try {
				filenm = file;
				pw.println(filenm);
				final FileInputStream fis = new FileInputStream(filenm);
				final byte[] buffer = new byte[1024];
				int bytes = 0;
				while ((bytes = fis.read(buffer)) != -1) {
					out.write(buffer, 0, bytes);
				}
				fis.close();
			} catch (final Exception exx) {
				System.out.println(exx.getMessage());
			}
		}
	}

	// Read in from the user
	public static String data_read() {
		String str = null;
		BufferedReader br_key = new BufferedReader(new InputStreamReader(
				System.in));
		try {
			str = br_key.readLine(); // save text that was typed to the
			// string "key"
		} catch (IOException ioe) {
			System.exit(1); // program exits on error
		}
		return str;
	}
}