Thread: [Request]Explanation about sending and recieving data

Hey all,
I am making a multiplayer game and I need to always send the place and state of the character from the client to the server and from the server to the client.
The question is, how to do it?
And can someone also explain the process in detail.
Thanks in advance,
Alex.

I've read this article before posting but I didn't understand how the communication is working, because how i see it, it scans input from the keyboard and sends it to the server
but I need that every action the player does it sends the x,y,state to the server.

The problem is that I can't fully understand how the communication between the socket and the serversocket works.
What I understood is that for example the server waits for me to write something and then it sends it to the client and the same happens in the client.
But I need it to send data without scanning something from the keyboard.

I tried using the PrintWriter and the BufferedReader but it just waits for me to input something, but thats not what I want.
I want it to send data automatically without me having to input anything.
Here is the code:
Client:

try{
            IP = this.ipText.getText();
            port = Integer.decode(this.portText.getText());
            socket = null;
        try {
            System.err.println("Trying to connect to host...");
            socket = new Socket(IP, port);
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream())); 
            System.err.println("Waiting for host to start game...");
            this.ipText.setVisible(false);
            this.portText.setVisible(false);
            this.Connect.setVisible(false);
            this.ipLbl.setText("Connected to " + IP);
            this.portLbl.setText("Waiting for host to start the game...");
            setSize(getWidth(),getHeight()-50);
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: "+IP+".");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: "+IP+".");
            System.exit(1);
        }
       /* try {
            socket.close();
        } catch (IOException ex) {
            Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
        }*/
        } catch(Exception e){
            JOptionPane.showMessageDialog(null, "Error: Field's are empty or port contains illegal characters.");
        }

Host:

 public Host() throws IOException {
        initComponents();
        serverSocket = null;
        try {
            serverSocket = new ServerSocket(port);
        } catch (IOException e) {
            System.err.println("Could not listen on port: "+port+".");
            System.exit(1);
        }
        try {
            System.err.println("Waiting for client...");
            clientSocket = serverSocket.accept();
            this.connectedMsg.setText(clientSocket.getInetAddress().getHostAddress() + " - has joined the game.");
            mk = new MortalKombat();
            servPlayer = new Player("Scorpion", mk, 50, mk.getFrameH()-200, false);
            mk.addPlayer(servPlayer, 1);
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }
        /*serverSocket.close();
        clientSocket.close();*/
    }
 
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        start = new javax.swing.JButton();
        connectedMsg = new javax.swing.JLabel();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        start.setText("start");
        start.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                startActionPerformed(evt);
            }
        });
 
        connectedMsg.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
        connectedMsg.setText("Connected player");
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(19, 19, 19)
                .addComponent(connectedMsg, javax.swing.GroupLayout.PREFERRED_SIZE, 362, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(19, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(174, Short.MAX_VALUE)
                .addComponent(start)
                .addGap(171, 171, 171))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(connectedMsg, javax.swing.GroupLayout.PREFERRED_SIZE, 21, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 28, Short.MAX_VALUE)
                .addComponent(start)
                .addContainerGap())
        );
 
        pack();
    }// </editor-fold>                        
 
private void startActionPerformed(java.awt.event.ActionEvent evt) {                                      
        try {
            out = new PrintWriter(clientSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader( clientSocket.getInputStream())); 
        } catch (IOException ex) {
            Logger.getLogger(Host.class.getName()).log(Level.SEVERE, null, ex);
        }
    mk.setVisible(true);
    this.setVisible(false);
    System.err.println("Game starting..");
}