server

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketTimeoutException;
import java.util.ArrayList;

public class FileServer extends Thread {
	private static ArrayList<String> files;
	private static final int port = 4711;

	private ServerSocket serverSocket;

	public FileServer(int port) throws Exception {
		serverSocket = new ServerSocket(port);
		serverSocket.setSoTimeout(100000);
	}

	public void run() {
		while (true) {
			try {
				System.out.println("Waiting for client on port " + serverSocket.getLocalPort() + "...");
				Socket server = serverSocket.accept();
				System.out.println("Just connected to " + server.getRemoteSocketAddress());
				DataInputStream in = new DataInputStream(server.getInputStream());
				DataOutputStream out = new DataOutputStream(server.getOutputStream());

				switch (in.readUTF()){
					case "dir":
						for (String fileName : files) {
							out.writeUTF(fileName);
						}
						out.flush();

				}

				//out.writeUTF("Thank you for connecting to " + server.getLocalSocketAddress() + "\nGoodbye!");

				in.close();
				out.close();
				server.close();
				serverSocket.close();
			} catch (SocketTimeoutException s) {
				System.out.println("Socket timed out!");
				break;
			} catch (Exception e) {
				e.printStackTrace();
				break;
			}
		}
	}

	public static void main(String[] args) {

		files = new ArrayList<String>();

		if (args.length > 0) {
			for (int i = 0; i < args.length; i++) {
				files.add(args[i]);
	        }
			System.out.println(files.size() + " files loaded!");
		}else{
			System.out.println("No files loaded!");
		}

		try {
			Thread t = new FileServer(port);
			t.start();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}