New Protocol?

[lada.r]

Hello, I´m trying to send more files than 1 file from client to server via TCP. Server has to save the retrieved file to disc.

Code:

public class Client {
           connect(port, ip);
        doCopy(vstup_k);
 
    }
    public static void doCopy(  Scanner scann){
            while(file_number>0 ){
             if(accepted){
            System.out.println("Type absolute Path to the file");
            path=scann.nextLine();
        if( test_souboru(cesta)){
            copy(path,os); //os is outputstream
           file_number--;}
        }
            }
    
    }
  
    
    public static void connect(int portik, String ip_ad){
        try{
            socket = new Socket(ip_ad, portik);
            os = socket.getOutputStream();            
        } catch(IOException a){
            System.out.println(a.toString());
            System.exit(1);
        }
        
    }
    public static void copy(String path,OutputStream a) {
        accepted=false;
 
        try{
            File file = new File(path);
            
            file_in = new FileInputStream(file);
            DataOutputStream data_o=new DataOutputStream(a);
            data_in=new DataInputStream(socket.getInputStream());
            int lLength;
                
       
            data_o.writeUTF(file.getName());
                  while ((lLength =  file_in.read(buffer)) > 0) {
                a.write(buffer, 0, lLength);
            }
            String mess=data_in.readUTF();
            if(mess=="Accepted"){
            accepted=true;
            }
                 try{
         file_in .close();
            os.close();
        } catch(IOException ta){
                System.out.println(ta.toString());
            }
        } catch(IOException b){
            System.out.println(b.toString());
        }
  
    }
    
    
}

And server part

Code:

public class Server implements Runnable {
    
       public static void main(String[] _) {
        try {
            ServerSocket listener = new ServerSocket(port);
            
            while (true) {
                Server  file_rec = new Server();
                file_rec.socket = listener.accept();
                
                new Thread( file_rec ).start();
            }
        } catch (java.lang.Exception ex) {
            ex.printStackTrace(System.out);
        }
    }
    
    public void run() {
        int asa=4; //this is variable which tells the server that 4 files will be transfer, I haven´t fixed the problem with sending server the number of files which are transfering from client
        while(asa>0){
            acceptAndSave();
            asa--;
            buffer=new byte[128];
        }
        try{
            out.close();
            in.close();
        }catch(IOException wq){
            System.out.println(wq.toString());
        }
    }
    public  void acceptAndSave(){
        String file_name="";
        boolean name=false;
        
        try {
            File file=new File("server_copy");
            in = socket.getInputStream();
            out=new FileOutputStream(file);
            data_i=new DataInputStream(socket.getInputStream());
            data_o=new DataOutputStream(socket.getOutputStream());
            int length;
            
            if(!name){
                file=new File(data_i.readUTF());
                System.out.println(file.getName());
                out = new FileOutputStream(file);
                file_name=file.getName();
                name=true;
            }
            
            while ((length = in .read(buffer)) >=0) {
                out.write(buffer,0, length);
            }
            name=false;
            System.out.println("Byl prijat soubor klientem a nazvan "+file_name);
            data_o.writeUTF("Accepted");
            
        } catch (java.lang.Exception ex) {
            ex.printStackTrace(System.out);
            
        }
        
    }
}

And now client sends 1 file and server accepts it and saves it on disk but after this both (client and server) are waiting for somethig (probably client doesn´t notice that server has sent message "Accepted" but I don´t know why, or mayebe Server hasn´t sent the messge ). Please could you help me?