Client-Server Java Program (Socket Programming) - The Coding Shala

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Client-Server Java Program (Socket Programming)

Java Program to Send a Message from Client to Server and receive a Response back using socket programming.

The first step is to run the Server.java program. Then Run Client.java program and enter the IP address and port address of the server into the Client program.

Java Code of Server.Java: 

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class Server
{
private static Socket socket;

public static void main(String[] args)
    {
        try
        {
 
            int port = 25000;
            ServerSocket serverSocket = new ServerSocket(port);
            System.out.println("Server Started and listening to the port 25000");
 
            //Server is running always. This is done using this while(true) loop
            while(true)
            {
                //Reading the message from the client
                socket = serverSocket.accept();
                InputStream is = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                String msgs = br.readLine();
                System.out.println("Message received from client is :"+msgs);
 
                // send message back
                   
                 String returnMessage = "Bye Bye Client" + "\n";
               
               
 
                //Sending the response back to the client.
                OutputStream os = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(os);
                BufferedWriter bw = new BufferedWriter(osw);
                bw.write(returnMessage);
                System.out.println("Message sent to the client is :"+returnMessage);
                bw.flush();
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                socket.close();
            }
            catch(Exception e){}
        }
    }

}

Java Code of Client.Java: 

import java.io.*;
import java.util.Scanner;
import java.net.InetAddress;
import java.net.Socket;
 
public class Client
{
 
    private static Socket socket;
 
    public static void main(String args[])
    {
        try
        {
            Scanner in = new Scanner(System.in);
            //String host = "localhost";
            System.out.println("please enter ip address");
            String host = in.nextLine();

            System.out.println("Please enter the port number");
            int port = in.nextInt();

           
            
            InetAddress address = InetAddress.getByName(host);
            socket = new Socket(address, port);
 
            //Send the message to the server
            OutputStream os = socket.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            BufferedWriter bw = new BufferedWriter(osw);
 
            String msgs = "Hello Server";
 
            String sendMessage = msgs + "\n";
            bw.write(sendMessage);
            bw.flush();
            System.out.println("Message sent to the server : "+sendMessage);
 
            //Get the return message from the server
            InputStream is = socket.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String message = br.readLine();
            System.out.println("Message received from the server : " +message);

        }
        catch (Exception exception)
        {
            exception.printStackTrace();
        }
        finally
        {
            //Closing the socket
            try
            {
                socket.close();
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
        }
    }
}

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