Serializable ObjecOutputStream object

Question

I want to make server client aplication and use ObjecOutputStream to send Object to client, but in object which I want to send is ObjectOutputStream object and I need to serializable it somehow but I dont know how... any advice?

I need to send object Player:

public class Player implements Serializable{
    ObjectOutputStream out;
    public Player(ObjectOutputStream out){
        this.out = out;
    }
    public send(){
        this.out.writeObject(this);
    }
}

after launch similar code like this an exeption show this:
java.io.NotSerializableException: java.io.ObjectOutputStream

Genzer · Accepted Answer · 2014-04-20T19:07:08.017

Since ObjectOutputStream doesn't implement Serializable, so your Player class cannot be serialized. To fix it:

class Player implements Serializable {
    private transient ObjectOutputStream out;

    // the rest
}

In my opinion, the Player should not know how to send itself. You can introduce a new class PlayerSender:

class PlayerSender {

    private ObjectOutputStream outputStream;

    public PlayerSender(OutputStream out) {
        this.outputStream = new ObjectOutputStream(out);
    }

    public void send(Player player) {
        this.outputStream.writeObject(player);
    }

}

//---- Usage ----

List<Player> players = // make a bunch of players;

PlayerSender playerSender = new PlayerSender(getNetworkStream());
//PlayerSender playerSender = new PlayerSender(new FileOutputStream("/players/list.txt");
//PlayerSender playerSender = new PlayerSender(socketConnection.getOutputStream());
for (Player player : players) {
    playerSender.send(player);
}

padawan · Answer 2 · 2014-04-20T19:02:30.147

0

Here is a code that could help

public void toTXT(String fileName)
{
    try
    {
        // Serialize data object to a file
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(fileName));
        out.writeObject(player); // player is an instance of Player class
        out.close();


    } 
    catch (Exception e) 
    {

    }
}

This is the correct way to write your code:

public class Player implements Serializable{

    public Player(){

    }
    public ObjectOutputStream send(){
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("filename.txt"));
        this.out.writeObject(this);
        return out;
    }
}

And here is your main() function:

public static void main(String args[])
{

    Player player = new Player();
    player.send();

}

edited Apr 20 '14 at 19:02

answered Apr 20 '14 at 18:51

padawan

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it do not solve my problem. In Player class is ObjectOutputStream object which is not serializable.. i can not send it – user3412372 Apr 20 '14 at 18:55
You should not use the `ObjectOutputStream` as an attribute. Use it in a method just like I've written. – padawan Apr 20 '14 at 18:58

Serializable ObjecOutputStream object

2 Answers2