Messages posted by: thornt5748

First things, thank you for your reply, secondly how would I do this? What would the coding be?

Thanks

Hi Guys,

I'm quite new here and am new to Java Programming, but i could use some help. I have a client-serve chat program and have almost finished it to my standards however I am trying to enable the server to accept multiple clients, how would i do this? what do i have to add or change on the server to allow this?

Thanks

Server

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

public class SwingChatServer extends SwingChatGUI
{
	public String outline;
    public String fromClient, s = "";
	PrintWriter out;
	BufferedReader in;
	BufferedReader stdin;
	String inputLine, outputLine;
	public ButtonHandler bHandler = new ButtonHandler();
    
	public SwingChatServer (String title)
	{
		super (title);
		bHandler = new ButtonHandler ();
		sendButton.addActionListener (bHandler);
	}

private class ButtonHandler implements ActionListener
	{
		public void actionPerformed (ActionEvent event)
		{
			outputLine = txArea.getText ();
			System.out.println ("Server :> " + outputLine);
			out.println (outputLine);
			outline = txArea.getText ();
			s = "Server :>"+ outline+"\n";
			rxArea.append(s);
			txArea.setText("");
    	}
	}
    
	public void run () throws IOException
	{
		ServerSocket serverSocket = null;
       
		try
        {
        	serverSocket = new ServerSocket (4444);
        }
        catch (IOException e)
        {
        	System.err.println ("Could not listen on port: 4444.");
        	System.exit (1);
        }

Socket clientSocket = null;
        try
        {
        	clientSocket = serverSocket.accept ();
        }
        catch (IOException e)
        {
        	System.err.println ("Accept failed.");
        	System.exit(1);
        }

out = new PrintWriter (clientSocket.getOutputStream (), true);
    	in = new BufferedReader (new InputStreamReader (clientSocket.getInputStream ()));
    	//stdin = new BufferedReader (new InputStreamReader (System.in));

out.println ("Welcome to the Chat Server");

while ((fromClient = in.readLine ()) != null) //allows a new line to not over write the chat
		{
			System.out.println ("Client :> " + fromClient);
			s = "Client :>" + fromClient + "\n";
			rxArea.append (s);
			
			if (fromClient.equals ("Bye"))System.exit(0);

}
		
        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    }

public static void main(String[] args) //throws IOException
    {

SwingChatServer frame = new SwingChatServer ("Chat Server Program");
		
		frame.pack ();
		frame.setVisible(true);
		frame.setIconImage(Toolkit.getDefaultToolkit().getImage("chat.jpg"));
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
		try
		{
			frame.run ();
		}
		catch (IOException e)
		{
			System.err.println("Couldn't get I/O for the connection to: 194.81.104.118!\n");
			System.exit(1);
		}

} 
}

Hi Guys, I have this "Server" application that I run and compile through that command prompt in windows. This runs in conjunction with a client version of this script and extends to a java gui application. This program takes whats written within a text area on the server and outputs it to a text area on the client program. Every time a new message is typed and sent it over writes what has already been sent. I want to do it so that when I send another line to it will displays on a new line rather than overwrite the previous. What do i need to put in and where? Thanks very much in advance

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

public class SwingChatServer extends SwingChatGUI
{
PrintWriter out;
BufferedReader in;
BufferedReader stdin;
String inputLine, outputLine;
public ButtonHandler bHandler = new ButtonHandler();

public SwingChatServer (String title)
{
super (title);
bHandler = new ButtonHandler ();
sendButton.addActionListener (bHandler);
}

private class ButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent event)
{
String outputLine;
outputLine = InputArea.getText ();
System.out.println ("Server > " + outputLine);
out.println (outputLine);
}
}

public void run () throws IOException
{
ServerSocket serverSocket = null;

try
{
serverSocket = new ServerSocket (4444);
}
catch (IOException e)
{
System.err.println ("Could not listen on port: 4444.");
System.exit (1);
}

Socket clientSocket = null;
try
{
clientSocket = serverSocket.accept ();
}
catch (IOException e)
{
System.err.println ("Accept failed.");
System.exit(1);
}

out = new PrintWriter (clientSocket.getOutputStream (), true);
in = new BufferedReader (new InputStreamReader (clientSocket.getInputStream ()));
//stdin = new BufferedReader (new InputStreamReader (System.in));

out.println ("Welcome to the Chat Server\n");

while ((inputLine = in.readLine ()) != null)
{
System.out.println ("Server < " + inputLine);
OutputArea.setText (inputLine);
}

out.close();
in.close();
clientSocket.close();
serverSocket.close();
}

public static void main(String[] args) //throws IOException
{

SwingChatServer frame = new SwingChatServer ("Chat Server Program");

frame.pack ();
frame.setVisible(true);
try
{
frame.run ();
}
catch (IOException e)
{
System.err.println("Couldn't get I/O for the connection to: 194.81.104.118.");
System.exit(1);
}

}
}

Thanks for such a speedy reply, I really appreciate your feedback. I have attempted what you said but like I mentioned I have no idea what i'm doing, so it didn't work lol. Thanks anyway though.

import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

import javax.swing.*;

public class DatagramGUI extends JFrame implements ActionListener {

private JPanel jPMain;
private JLabel jLHost;
private JTextField jTFHost;
private JButton jBGet;
private JTextField jTFResult;

public static void main
{
DatagramGUI frame = new DatagramGUI();
frame.setSize(500, 300);
frame.DatagramGUI();
frame.setVisible(true);
frame.setTitle("Request date and time");
frame.setLocationRelativeTo(null);
}

private void DatagramGUI() {

setDefaultCloseOperation(EXIT_ON_CLOSE);
Container window = getContentPane();
window.setLayout(new BorderLayout());

jPMain = new JPanel();
jPMain.setLayout(new GridLayout (4,1));
window.add(jPMain);

jLHost = new JLabel("Enter Host IP");
jPMain.add(jLHost);

jTFHost = new JTextField("");
jPMain.add(jTFHost);

jBGet = new JButton("Request Date and Time");
jPMain.add(jBGet);
jBGet.addActionListener(this);

jTFResult = new JTextField("");
jPMain.add(jTFResult);

}
public void actionPerformed(ActionEvent event)
{
if (args.length != 1)
{
System.out.println("Usage: java DatagramClient <hostname>");
return;
}

// get a datagram socket
DatagramSocket socket = new DatagramSocket();

// send request
byte[] buf = new byte[256];
InetAddress address = InetAddress.getByName(args[0]);
DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 4455);
System.out.println ("About to request date & time");
socket.send(packet);
System.out.println ("Sent request for date and time");

// get response
packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
System.out.println ("Received date & time");

// display response
String received = new String(packet.getData());
System.out.println("Remote Date and Time: " + received);

socket.close();
}

}

Hi guys,

I know i'm new here but i'm really in need of some help, I have been given a client side Java snippet of code that request the data and time from a Java server and have been tasked to combine it with a GUI interface. I have start the make the GUI but I have no idea how to incorporate the client request. I know there may be other ways of creating the GUI but it needs to be done like this, and the coding needs to be as simple as possible. I know you can't actually combine to two codes directly and have to add the request as an on-click action to a button but I have no idea how t do this as I am a complete novice.

Thanks in advance

Here's the GUI Coding

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

public class DatagramGUI extends JFrame {

private JPanel jPMain;
private JLabel jLHost;
private JTextField jTFHost;
private JButton jBGet;
private JTextField jTFResult;

public static void main (String[] args)
{
DatagramGUI frame = new DatagramGUI();
frame.setSize(500, 300);
frame.DatagramGUI();
frame.setVisible(true);
frame.setTitle("Request date and time");
frame.setLocationRelativeTo(null);
}

private void DatagramGUI() {

setDefaultCloseOperation(EXIT_ON_CLOSE);
Container window = getContentPane();
window.setLayout(new BorderLayout());

jPMain = new JPanel();
jPMain.setLayout(new GridLayout (4,1));
window.add(jPMain);

jLHost = new JLabel("Enter Host IP");
jPMain.add(jLHost);

jTFHost = new JTextField("");
jPMain.add(jTFHost);

jBGet = new JButton("Request Date and Time");
jPMain.add(jBGet);

jTFResult = new JTextField("");
jPMain.add(jTFResult);

}
}

Here's the client/server Request Coding

import java.io.*;
import java.net.*;
import java.util.*;

/*
Compile: javac DatagramClient.java
Run: java DatagramClient // DatagramServer must be running
*/

public class DatagramClient
{
public static void main(String[] args) throws IOException
{

if (args.length != 1)
{
System.out.println("Usage: java DatagramClient <hostname>");
return;
}

// get a datagram socket
DatagramSocket socket = new DatagramSocket();

// send request
byte[] buf = new byte[256];
InetAddress address = InetAddress.getByName(args[0]);
DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 4455);
System.out.println ("About to request date & time");
socket.send(packet);
System.out.println ("Sent request for date and time");

// get response
packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
System.out.println ("Received date & time");

// display response
String received = new String(packet.getData());
System.out.println("Remote Date and Time: " + received);

socket.close();
}
}