Problema Connessione

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

public class Client {
Socket socket;
String msg;    
Client() throws UnknownHostException, IOException, ClassNotFoundException{
    try{socket=new Socket("localhost",3000);
   // InetSocketAddress indirizzo= new InetSocketAddress("",300);
  //  socket.connect(indirizzo);
    }
    catch(IOException ex){}    
  invia();   /*ricevi();*/   
    }



public void ricevi() throws IOException, ClassNotFoundException{
   
 File salva = new File ("C:/Users/Lorenzo/Desktop/Nuova cartella/Prova.pdf");
FileOutputStream  fos = new FileOutputStream(salva);
InputStream is = socket.getInputStream();
byte[] buf = new byte[is.available()];
int p = 0;
while((p=is.read(buf))!=-1) {
     fos.write(buf);                                      
}
}
    public void invia() throws IOException{
    ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
    Scanner lettore= new Scanner(System.in);
   for(;;){
    String msg=lettore.nextLine();
    out.writeObject(msg);
   }
    }
public static void main(String[] args) throws UnknownHostException, IOException, ClassNotFoundException {
        Client client = new Client();

}
}

public class Server {
Socket socket;
ServerSocket sockets;
ObjectInputStream in;
String msg;   
ServerSocketChannel socketChannel;
Server()throws IOException, ClassNotFoundException{
try{
   sockets= new ServerSocket(3000);
socket=sockets.accept();

}
catch(IOException ex){}

   ricevi();/*invia();*/    
}

public void invia() throws IOException{
 File invia = new File("C:/Users/Lorenzo/Desktop/NonBlockingSocket.pdf");
ObjectOutputStream o = new ObjectOutputStream(socket.getOutputStream()); 
FileInputStream is = new FileInputStream(invia);

//in questo modo dovrei sapere la dimensione del file da spedire e creare un
//array di byte di tale dimensione, leggo i dati e li scrivo nella socket
Object i=0;
byte[] dati = new byte[is.available()];
while((i=is.read(dati))!=-1){o.writeObject(dati);}



    }


 public void ricevi() throws IOException, ClassNotFoundException{
   in= new ObjectInputStream(socket.getInputStream());
  do{
    msg = (String)in.readObject();
   System.out.println(msg);
  }while(!msg.contains("Bye"));
   }
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        new Server();
        
    }


}