All the tutorials I have read and watched about java socket programming involve one common, essential word, which is localhost. I've been playing with java server-client programms for a while, did a little bit of experimentation. But everytime, my computer was both the server and the client, so I didn't quite understand how to make things work when it comes to other other computers that try to connect to the server hosted on my computer.
Take the following basic server-client classes, for instance:
Server-Class
public class TestServerSocket {
public static void main(String args[]) throws IOException {
final int portNumber = 444;
System.out.println("Creating server socket on port " + portNumber);
ServerSocket serverSocket = new ServerSocket(portNumber);
while (true) {
Socket socket = serverSocket.accept();
OutputStream os = socket.getOutputStream();
PrintWriter pw = new PrintWriter(os, true);
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//...code...
}
socket.close();
pw.close();
os.close();
br.close();
}
}
Client-Class
public class TestClientSocket {
public static void main(String args[]) throws IOException {
final String host = "localhost";
final int portNumber = 444;
System.out.println("Creating socket to '" + host + "' on port " + portNumber);
while (true) {
Socket socket = new Socket(host, portNumber);
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader userInputBR = new BufferedReader(new InputStreamReader(System.in));
//...code...
}
socket.close();
out.close();
br.close();
userInputBR.close();
}
}
Now, say I want to run the TestServerSocket on my computer, and have my friend run the TestClientSocket on his. What changes will there have to be made to this code in order for that to work?
