Sending object, int and String via socket, serialisation

Question

so I have a PrintWriter and a ObjectOutputStream trying to send an int, String and a Color[] from the client when the user clicks the list, where 'out' is the PrintWriter and outObject is the ObjectOutputStream.

private class MyMouseListener implements MouseListener{
  public void mouseExited(MouseEvent e){}
  public void mouseEntered(MouseEvent e){}
  public void mouseClicked(MouseEvent e){
      if(e.getSource() == list){
          int index = list.locationToIndex(e.getPoint());   ///get the game that the player has selected          
          try{
              out.println(index);
                              out.println("hel");
                              Color[] colors = new Color[5];
                              outObject.writeObject(colors)
          }
}

Server, where 'in' is a scanner, 'objectIn' is an objectInputStream :

                while(true)
                    if(in.nextLine().equals("hel")){
                    System.out.println("fee");
                }
                else if(in.hasNextInt()){
                    System.out.println("dee");
                }
                Object o = objectIn.readObject();
                if(o instanceof Color[]){
                    System.out.println("ree");
                }

If i try to send all three, on the first click the server only registers the String, and then all clicks after the server only registers the int, never registering the Color[], if i send the int first, then the Color[] and then the int like :`

                              out.println(index);
                              Color[] colors = new Color[5];
                              outObject.writeObject(colors);
                              out.println("hel");

Only the int and Object are registered first, on the second click only the String and then subsequent clicks only the int. `

                Object o = objectIn.readObject();
                if(in.nextLine().equals("hel")){
                    System.out.println("fee");
                }
                //Object o = objectIn.readObject(); 
                else if(in.hasNextInt()){
                    System.out.println("dee");
                }
                else if(o instanceof Color[]){
                    System.out.println("ree");
                    o = null;
                }

If I use the above series of if statements nothing is registered

Using the first series of if statements, if i try to send the Color[] on it's own it's not registered, but if I send it with an int both are registered. If i try to send the String and the Color[], sending the String first like so :

              out.println("hel");
              Color[] a = new Color[5];
              outObject.writeObject(a);

both are registered once and then never again, also in the opposite way than was expected i.e the Color[] was registered first and then the String; if i send both but the Color[] first and then the String neither are registered.

Community · Accepted Answer · 2017-05-23 11:56:09Z

1

I assume your out object (which is a PrintWriter) wraps the outObject object, which is the ObjectOutputStream. You should not use both a PrintWriter and a ObjectOutputStream for the same underlying connection. See this question for more details.

edited May 23, 2017 at 11:56

CommunityBot

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answered Nov 30, 2013 at 22:31

Kevin

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1 Comment

John Collins Over a year ago

I assume a scanner would interfere with with an objectinputstre as we'll ?,not that I would want one without the printwriter

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