<div class="image-550">
<img src="https://cdn.kahimyang.com/resources-24/java-sockets.avif" loading="lazy" alt="Java Sockets" />
</div>
<p>
This guide will cover the basics of socket programming in Java, with practical examples to help you get started.
</p>
<h4>
What is Socket Programming?
</h4>
<p>
Socket programming involves the creation of network applications that communicate using sockets. A socket is an endpoint for sending or receiving data across a computer network. There are two main types of sockets:
</p>
<ol class="k-list">
<li>
TCP (Transmission Control Protocol) Sockets: Provides reliable, connection-oriented communication.
</li>
<li>
UDP (User Datagram Protocol) Sockets: Provides connectionless, unreliable communication.
</li>
</ol>
<h4>
Setting Up a Simple Client-Server Application
</h4>
<p>
To understand socket programming, let's create a simple client-server application using <b>TCP sockets</b>.
</p>

<h4>
Step 1: Creating the TCP Server
</h4>
<p>
The server will listen for incoming connections and respond to client requests. Here's the code for a basic server:
</p>
<pre style="font-size: 90%;">
<code class="language-java normalize-whitespace line-numbers" >
import java.io.*;
import java.net.*;

public class SimpleServer {
    public static void main(String[] args) {
        int port = 8080;
        try (ServerSocket serverSocket = new ServerSocket(port)) {
            System.out.println("Server started on port " + port);

            while (true) {
                try (Socket clientSocket = serverSocket.accept();
                     PrintWriter out = new PrintWriter(
                         clientSocket.getOutputStream(), true);
                     BufferedReader in = new BufferedReader(
                         new InputStreamReader(
                            clientSocket.getInputStream()))) {

                    String inputLine;
                    while ((inputLine = in.readLine()) != null) {
                        System.out.println("Received: " + inputLine);
                        out.println("Echo: " + inputLine);
                    }
                } catch (IOException e) {
                    System.err.println("Error in communication: " + 
                        e.getMessage());
                }
            }
        } catch (IOException e) {
            System.err.println("Could not start server: " + 
              e.getMessage());
        }
    }
}
</code>
</pre>
<p>
ServerSocket: This class is used to create a server socket that listens for incoming connections on a specified port.
</p>
<p>
accept(): This method waits for a client to connect and returns a Socket object representing the client connection.
</p>
<p>
PrintWriter and BufferedReader: These classes are used for sending and receiving data through the socket.
</p>


A Comprehensive Guide to Socket Programming in Java