3 replies to this topic

[blacksage]

I just started programming with sockets and wrote a little program that sets up a server and waits for a client(s) to join. To connect to the server I just did telnet 192.168.0.201 4141. My question is can I connect to the server outside of my network?

package ChatRoom;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class ChatRoomServer {
	String username;
	String message = "";
	List<Chatter> chatters = new ArrayList<Chatter>();

	public void go() {
		try {
			PartyLine partyLine = new PartyLine();
			ServerSocket socket = new ServerSocket(8989);
			while (true) {
				Socket sock = socket.accept();
				Chatter chatter = new Chatter(sock, partyLine);
				chatter.start();
				chatters.add(chatter);
			}
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

	public static void main(String[] args) {
		ChatRoomServer server = new ChatRoomServer();
		server.go();
	}

	class PartyLine {
		public void broadcast(String username, String message) {
			for(Chatter chatter : chatters) {
//				if(!chatter.username.equals(username)) {
					chatter.broadcast(username, message);					
//				}
			}
		}
	}
	
	class Chatter extends Thread {
		private final Socket socket;
		private final PartyLine partyLine;
		private String username;
		private PrintWriter writer;
		
		Chatter(Socket socket, PartyLine partyLine) {
			this.socket = socket;
			this.partyLine = partyLine;
		}

		public void run() {
			try {
				writer = new PrintWriter(socket.getOutputStream());
				InputStreamReader streamReader = new InputStreamReader(socket
						.getInputStream());
				BufferedReader reader = new BufferedReader(streamReader);
				writer.print("Username: ");
				writer.flush();
				username = reader.readLine();
				String message = "";
				while (!message.equals("exit")) {
					if(!message.equals("")) {
						partyLine.broadcast(username, message);
					}
					writer.print("<" + username + ">");
					writer.flush();
					message = reader.readLine();
				}
				writer.close();
			} catch (Exception e) {
				throw new RuntimeException(e);
			}
		}
		
		public void broadcast(String username, String message) {
			writer.println(username + ": " + message);
			writer.flush();
		}
	}
}

[APX]

chan!!
You need to read some basic networking...
If you are going to be able to connect from outside your network or not, isn't defined by your socket.
That's defined by your network configuration, Do you have a firewall? are you behind a NAT?
Drop your firewall, port foward the desired port in your nat and you can connect from wherever you want.

[blacksage]

chan!!
You need to read some basic networking...
If you are going to be able to connect from outside your network or not, isn't defined by your socket.
That's defined by your network configuration, Do you have a firewall? are you behind a NAT?
Drop your firewall, port foward the desired port in your nat and you can connect from wherever you want.

Thanks APX, I just got it to work. After I droped the firewall and setup port forwarding in my router it
worked.

[drakesword]

Did it work with multipul users? If i do remember correctly you have to cast your chatter object as a Thread to use start wthout blocking. Just maby, its been a while sence i have programmed in java.