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How to Make a Server to Allow the Connection to the Socket 6123 in Java?
  • Last Updated : 11 Nov, 2020

A socket connection means the two machines have information about each other’s network location (IP Address) and TCP port. The java.net.Socket class represents a Socket. Here, we are going to look at the approach of connecting to socket 6123.

Approach:

  • Create an object of Socket class and pass 6123 as an argument.
  • Accept connections with accept() method of ServerSocket class.
  • Get the address of the connection with getInetAddress() method of Socket class and getHostAddress() of InetAddress class.

Server Code:

Java

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// Make a server to allow the connection to the socket 6123
  
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
  
public class Server {
    public static void main(String[] args) { check(); }
    private static void check()
    {
        try {
            // Creating object of ServerSocket class
            ServerSocket connection
                = new ServerSocket(6123);
            
            while (true) {
                System.out.println("Listening");
  
                // Creating object of Socket class
                Socket socket = connection.accept();
  
                // Creating object of InetAddress class
                InetAddress address
                    = socket.getInetAddress();
                
                System.out.println(
                    "Connection made to "
                    + address.getHostAddress());
                pause(1000);
                    
                  // close the socket
                socket.close();
            }
        }
        catch (IOException e) {
            System.out.println("Exception detected: " + e);
        }
    }
    private static void pause(int ms)
    {
        try {
            Thread.sleep(ms);
        }
        catch (InterruptedException e) {
        }
    }
}

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Output

Server program



Client Code:

Java

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// A Java program for a Client
  
import java.net.*;
import java.io.*;
  
public class Client {
    // initialize socket and input output streams
    private Socket socket = null;
    private DataInputStream input = null;
    private DataOutputStream out = null;
  
    // constructor to put ip address and port
    public Client(String address, int port)
    {
        // establish a connection
        try {
            socket = new Socket(address, port);
            System.out.println("Connected");
  
            // takes input from terminal
            input = new DataInputStream(System.in);
  
            // sends output to the socket
            out = new DataOutputStream(
                socket.getOutputStream());
        }
        catch (UnknownHostException u) {
            System.out.println(u);
        }
        catch (IOException i) {
            System.out.println(i);
        }
  
        // string to read message from input
        String line = "";
  
        // keep reading until "Over" is input
        while (!line.equals("Over")) {
            try {
                line = input.readLine();
                out.writeUTF(line);
            }
            catch (IOException i) {
                System.out.println(i);
            }
        }
  
        // close the connection
        try {
            input.close();
            out.close();
            socket.close();
        }
        catch (IOException i) {
            System.out.println(i);
        }
    }
  
    public static void main(String args[])
    {
        Client client = new Client("127.0.0.1", 6123);
    }
}

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Output

Client program

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