Basic Client and Server in Java

Java Client

import java.io.BufferedInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.net.Socket;

public class Client {
    public static void main(final String[] argv) throws Exception {
        final File folder = new File(System.getProperty("user.dir"));

        while (true) {
            final File[] listOfFiles = folder.listFiles();
            for (final File listOfFile : listOfFiles) {
                if (listOfFile.isFile()) {
                    System.out.println(listOfFile.getAbsolutePath().toString());
                    final File myFile = new File(listOfFile.getAbsolutePath()
                            .toString());
                    final long size = myFile.length();
                    if ((size / 1024) <= 100) {
                        final Socket sock = new Socket("127.0.0.1", 9999);
                        final byte[] mybytearray = new byte[(int) myFile
                                .length()];
                        final BufferedInputStream bis = new BufferedInputStream(
                                new FileInputStream(myFile));
                        if (mybytearray.length > 0) {
                            bis.read(mybytearray, 0, mybytearray.length);
                        }

                        final OutputStream os = sock.getOutputStream();
                        final DataOutputStream dos = new DataOutputStream(os);
                        dos.writeUTF(myFile.getName());
                        if (mybytearray.length > 0) {
                            dos.writeLong(mybytearray.length);
                            dos.write(mybytearray, 0, mybytearray.length);
                        }
                        dos.flush();

                        if (mybytearray.length > 0) {
                            os.write(mybytearray, 0, mybytearray.length);
                        }
                        os.flush();
                        sock.close();
                        bis.close();
                    }
                }
            }
        }
    }
}

Java Server

import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(final String[] args) throws IOException {
        final ServerSocket servsock = new ServerSocket(9999);

        String fileName = "test";
        while (true) {
            final Socket sock = servsock.accept();
            final byte[] mybytearray = new byte[1024];
            final InputStream is = sock.getInputStream();
            final DataInputStream clientData = new DataInputStream(is);
            if (clientData != null) {
                fileName = clientData.readUTF();
            }
            final FileOutputStream fos = new FileOutputStream("..files/"
                    + fileName);
            System.out.println(fileName);
            final BufferedOutputStream bos = new BufferedOutputStream(fos);
            int bytesRead = 0;

            while (bytesRead >= 0) {
                bytesRead = is.read(mybytearray, 0, mybytearray.length);
                if (bytesRead >= 0) {
                    bos.write(mybytearray, 0, bytesRead);
                }
                // if (bytesRead < 1024)
                // {
                // bos.flush();
                // break;
                // }
            }
            bos.close();
            sock.close();
        }
    }
}