Java communication software design 3(updating....)

The third server and client program is about the file transfering.....

FileServer.java:
[java]
import java.net.*;
import java.io.*;

public class FileServer {
public static void main (String [] args ) throws IOException {
    // create socket
    ServerSocket servsock = new ServerSocket(1234);
    while (true) {
      System.out.println("File Server Waiting for Client...");

      Socket sock = servsock.accept();
      System.out.println("Accepted connection : " + sock);

      // sendfile
      File myFile = new File ("CSD.ppt");
      byte [] mybytearray = new byte [(int)myFile.length()];
      FileInputStream fis = new FileInputStream(myFile);
      BufferedInputStream bis = new BufferedInputStream(fis);
      bis.read(mybytearray,0,mybytearray.length);
      OutputStream os = sock.getOutputStream();
      System.out.println("Sending...");
      os.write(mybytearray,0,mybytearray.length);
      os.flush();
      sock.close();
      }
    }
}

FileClient.java:
[java]
import java.net.*;
import java.io.*;

public class FileClient{
public static void main (String [] args ) throws IOException {
    int filesize=6022386; // filesize temporary hardcoded

    long start = System.currentTimeMillis();
    int bytesRead;
    int current = 0;
    // localhost for testing
    Socket sock = new Socket("127.0.0.1",1234);
    System.out.println("Connecting...");

    // receive file
    byte [] mybytearray = new byte [filesize];
    InputStream is = sock.getInputStream();
    FileOutputStream fos = new FileOutputStream("CSD.ppt");
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    bytesRead = is.read(mybytearray,0,mybytearray.length);
    current = bytesRead;


    do {
       bytesRead =
          is.read(mybytearray, current, (mybytearray.length-current));
       if(bytesRead >= 0) current += bytesRead;
    } while(bytesRead > -1);

    bos.write(mybytearray, 0 , current);
    bos.flush();
    long end = System.currentTimeMillis();
    System.out.println(end-start);
    bos.close();
    sock.close();
}
}

Goal: the file server send the csd.ppt to file client:
the following gif is the test result:

补充：软件开发 , Java ,