client server communication problem

[oll3i]

package zad41;
 
 
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.net.*;
 
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
 
public class SimpleClient {
     String action=null;
     String lastname=null;
     String number_with=null;
     PhoneDirectory phonedirectory = new PhoneDirectory("numbers.txt");
     public SimpleClient(){
 
 
 
         search.addActionListener( new ActionListener() {
         public void actionPerformed(ActionEvent e) {
                System.out.println("Get");
                action="get";
                lastname=(String)namesList1.getSelectedItem();
         }});
 
         add.addActionListener( new ActionListener() {
         public void actionPerformed(ActionEvent e) {
              System.out.println("Add");
              action="add";
              lastname=add_name.getText();
         }});    
 
         replace.addActionListener( new ActionListener() {
         public void actionPerformed(ActionEvent e) {
                System.out.println("Replace");
                action="replace";
                lastname=(String)namesList2.getSelectedItem();
                number_with=replace_with.getText();
         }});   
         bye.addActionListener( new ActionListener() {
             public void actionPerformed(ActionEvent e) {
                    System.out.println("Bye");
                    action="Bye";
                    }});     
     }
     JButton    search    = new JButton("Wyszukaj");
     JButton    add    = new JButton("Dodaj");
     JButton    replace    = new JButton("Zastap");
     JButton    bye    = new JButton("Bye");
     JTextField add_name     = new JTextField(20);
     JTextField replace_with     = new JTextField(20);
     JTextField output     = new JTextField(20);
     JComboBox namesList1 = new JComboBox(phonedirectory.getNames());
     JComboBox namesList2 = new JComboBox(phonedirectory.getNames());
 
     Socket kkSocket = null;
    PrintWriter out = null;
    BufferedReader in = null;
 
    public JPanel createPanel(){
 
 
        JPanel pane = new JPanel();
        JLabel label1 = new JLabel("Wyszukaj");
        JLabel label2 = new JLabel("Dodaj");
        JLabel label3 = new JLabel("Zastap");
        pane.setBorder(BorderFactory.createTitledBorder("Client"));
        pane.setLayout(new BoxLayout(pane, BoxLayout.X_AXIS));
        pane.add(label1); 
        pane.add(namesList1);
        pane.add(search);
        pane.add(label2);
        pane.add(add_name);
        pane.add(add);
        pane.add(label3);
        pane.add(replace_with);
        pane.add(namesList2);
        pane.add(replace);
        pane.add(output);
        pane.add(bye);
        output.setEditable(false);
        return pane;
 
    }
 
    public void connect(){
 
        try {
            kkSocket = new Socket("localhost", 4445);
            out = new PrintWriter(kkSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: localhost.");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: localhost.");
            System.exit(1);
        }
    }
 
    public void communicate(){
 
        ///BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
        String fromServer;
         try {
            while ((fromServer = in.readLine()) != null) {
                 System.out.println("Server: " + fromServer);
                 output.setText(fromServer);
                 if (fromServer.equals("Bye."))
                     break;
 
                 ////fromUser = stdIn.readLine();
            if (action != null) {
                     System.out.println("Client: " + action);
 
 
                     ///out.println(action);
 
 
                     if(lastname!=null){
                          out.println(action+":"+lastname);
                     }
 
 
 
                     if(number_with!=null){
                         String info[]=number_with.split(" ");
                         out.println(action+":"+info[0]+":"+info[1]);
                     }
            }
             }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
 
    public void close() throws IOException{ 
     out.close();
    in.close();
    ///stdIn.close();
    kkSocket.close();}
 
 
     public static void main(String[] args) throws IOException {
 
         SimpleClient simpleclient = new SimpleClient();
 
          JFrame frame = new JFrame("Client");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
         frame.setContentPane(simpleclient.createPanel());
         frame.pack();
 
         frame.setVisible(true);
         simpleclient.connect();
         simpleclient.communicate();
         simpleclient.close();
 
    }
}
 

client receives the hello message from server
but it doesnt send the messages to server
i want when a button is clicked send an action to the server

[JosAH]

Issue an "out.flush( )" after writing to the server and read the API documentation
on flushing behaviour of PrintWriter objects.

kind regards,

Jos

[oll3i]

but out = new PrintWriter(kkS ocket.getOutput Stream(), true); is with automatic line flushing ?

[JosAH]

but out = new PrintWriter(kkS ocket.getOutput Stream(), true); is with automatic line flushing ?

I know it sounds silly but do try the explicit flush(). I know it is supposed to
flush at every println(), but it doesn't. It depends on whether or not the wrapped
Writer flushes on a new line character.

kind regards,

Jos

[oll3i]

i added out.flush() and still it doesnt send the message to the server the problem is somewhere else i think :(

[oll3i]

it goes through communicate() method ones and doesnt respond to buttons where i set the action var

[oll3i]

and it throws java.net.Socket Exception: when i close the client

[oll3i]

i solved it the server returns phone
numbers but i still get the java.net.Socket Exception when i close a client ?

[JosAH]

i solved it the server returns phone
numbers but i still get the java.net.Socket Exception when i close a client ?

Which side (client or server) throws the Exception? What is the reason the
Exception was thrown? Do a socketex.printS tackTrace() when you catch
the exception.

kind regards,

Jos