Mini network application test and help required

[louwhopley]

Can you people please help me with this one... I have written a small LAN chat-room.

The reason for this is for me to learn networking. This little program seems to look fine but I don't have the equipment to test it. (2 PC's on LAN)

Can someone please try to test it and please tell me what I am doing wrong?

import java.io.*;
import java.net.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Main implements ActionListener
{

    static JTextArea ta1 = new JTextArea (10, 10);
    static JButton btn1 = new JButton ("Click me");
    static JTextField txt1 = new JTextField (10);
    static String newMessage = "\n" + "   ------------------------------------------------" + "\n";
    static int socketNumber = 3333;
    static String IP;
    static ServerSocket mySocket;
    static Socket connectionSocket;
    static DataOutputStream outStream;
    static DataInputStream inStream;
    static BufferedReader inReader;
    static BufferedReader outReader;

    Main ()
    {
        try
        {
            mySocket = new ServerSocket (socketNumber);
        }
        catch (IOException abc)
        {
            ta1.append ("   Can't connect!" + "\n   " + abc + newMessage);
        }
        // Die GUI se uitleg
        JFrame myframe = new JFrame ("Chatr BOX");
        myframe.setSize (500, 500);
        myframe.getContentPane ().setBackground (Color.red);
        BorderLayout border = new BorderLayout ();
        myframe.getContentPane ().setLayout (border);
        btn1.setBackground (Color.blue);
        btn1.setForeground (Color.white);
        btn1.addActionListener (this);
        txt1.addActionListener (this);
        ta1.setEditable (false);
        ta1.setText ("   Type \"host\" to host a session\n   Type \"join\" to join a session" + newMessage);
        myframe.getContentPane ().add (btn1);
        myframe.getContentPane ().add (txt1);
        myframe.getContentPane ().add (ta1);
        myframe.getContentPane ().add ("North", txt1);
        myframe.getContentPane ().add ("South", btn1);
        myframe.getContentPane ().add ("Center", ta1);
        myframe.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        myframe.setLocationRelativeTo (null);
        myframe.setVisible (true);
        // Einde van die GUI se uitleg
    }


    public void actionPerformed (ActionEvent e)
    {
        if (e.getSource () == btn1)
        {
            String text = txt1.getText ();
            if (text.equals ("join"))
            {
                try
                {
                    IP = JOptionPane.showInputDialog ("Type the IP you wish to connect to (e.g. 192.168.0.15)");
                    connectionSocket = new Socket (IP, socketNumber);
                    outStream = new DataOutputStream (connectionSocket.getOutputStream ());
                    inReader = new BufferedReader (new InputStreamReader (connectionSocket.getInputStream ()));
                    ta1.append ("   Succesfully connected to:\n   " + IP + newMessage);
                }
                catch (IOException abc)
                {
                    ta1.append ("   Can't connect!" + "\n   " + abc + newMessage);
                }
            }
            else
                if (text.equals ("host"))
                {
                    try
                    {
                        connectionSocket = mySocket.accept ();
                        outStream = new DataOutputStream (connectionSocket.getOutputStream ());
                        inReader = new BufferedReader (new InputStreamReader (connectionSocket.getInputStream ()));
                        ta1.append ("   Succesfully hosted" + newMessage);
                    }
                    catch (IOException abc)
                    {
                        ta1.append ("   Can't connect!" + "\n   " + abc + newMessage);
                    }
                }
                else
                    if (connectionSocket == null)
                    {
                        ta1.append ("   You are not connected to any chat sessions\n   Type \"host\" to host a session\n   Type \"join\" to join a session" + newMessage);
                    }
                    else
                    {
                        try
                        {
                            outStream.writeBytes (text);
                        }
                        catch (IOException abc)
                        {
                            ta1.append ("   Unable to send!" + "\n   " + abc + newMessage);
                        }
                        ta1.append ("   Sent: " + text + newMessage);
                    }
            txt1.setText ("");
        }
    }


    static void receiveText ()
    {
        while (true)
        {
            if (connectionSocket != null)
            {
                try
                {
                    inReader = new BufferedReader (new InputStreamReader (connectionSocket.getInputStream ()));
                    ta1.append ("   Received: " + inReader.readLine () + newMessage);
                }
                catch (IOException abc)
                {
                    ta1.append ("   Can't connect!" + "\n   " + abc + newMessage);
                }
            }
        }
    }


    public static void main (String[] args) throws Exception
    {
        Main xyz = new Main ();
        receiveText ();
    }
}