Transfer Server

package com.j256.ormlite.jdbc;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(8080);
        while (true) {
            Socket socket = serverSocket.accept();
            // spawn a thread for this connection
            new Handler(socket).start();
        }
    }

    public static class Handler extends Thread {

        private final Socket socket;
        private BufferedOutputStream writer;
        private BufferedReader reader;

        public Handler(Socket socket) throws Exception {
            this.socket = socket;
            this.writer = new BufferedOutputStream(socket.getOutputStream());
            this.reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            System.out.println("FTP Client Connected ... " + socket);
        }

        @Override
        public void run() {
            try {
                upload();
                socket.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        public void upload() throws Exception {
            String file = reader.readLine();
            File f = new File(file);
            if (!f.exists()) {
                writer.write(0);
            } else {
                writer.write(1);
                FileInputStream fin = new FileInputStream(f);
                byte[] bytes = new byte[1024];
                while (true) {
                    int numRead = fin.read(bytes);
                    if (numRead <= 0) {
                        break;
                    }
                    writer.write(bytes, 0, numRead);
                }
                fin.close();
            }
            writer.flush();
        }
    }
}