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
// 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) { } }} |
Output
Client Code:
Java
// 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); }} |
Output
