How to make a server to allow the connection to the socket 6123 in Java

Problem Description

How to make a server to allow the connection to the socket 6123?

Solution

Following example shows how to make a server to allow the connection to the socket 6123 by using server.accept() method of ServerSocket class and sock.getInetAddress() method of Socket class.

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketDemo {
   public static void main(String[] args) {
      try {
         ServerSocket server = new ServerSocket(6123);
         while (true) {
            System.out.println("Listening");
            Socket sock = server.accept();
            InetAddress addr = sock.getInetAddress();
            System.out.println("Connection made to " + addr.getHostName() + " (
               " + addr.getHostAddress() + ")");
            pause(5000);
            sock.close();
         }
      } catch (IOException e) {
         System.out.println("Exception detected: " + e);
      }
   }
   private static void pause(int ms) {
      try {
         Thread.sleep(ms);
      }catch (InterruptedException e) {}
   }
}

Result

The above code sample will produce the following result.

Listening
Terminate batch job (Y/N)? n 
Connection made to 112.63.21.45