How to Secure Communication Using SSL/TLS in Java?

package server;

import javax.net.ssl.*;
import java.io.*;
import java.security.*;

public class SSLServer {
    private static final int PORT = 1234;

    public static void main(String[] args) {
        try {
            // Load keystore containing server's private key and certificate
            char[] password = "password".toCharArray();
            KeyStore keyStore = KeyStore.getInstance("JKS");

            try (FileInputStream fis = new FileInputStream("server.keystore")) {
                keyStore.load(fis, password);
            }

            // Create key manager factory
            KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
            kmf.init(keyStore, password);

            // Create SSL context
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(kmf.getKeyManagers(), null, null);

            // Create SSL server socket factory
            SSLServerSocketFactory ssf = sslContext.getServerSocketFactory();

            // Create SSL server socket
            try (SSLServerSocket serverSocket = (SSLServerSocket) ssf.createServerSocket(PORT)) {
                System.out.println("Server started. Waiting for client...");

                // Accept incoming connections
                try (SSLSocket clientSocket = (SSLSocket) serverSocket.accept()) {
                    System.out.println("Client connected.");

                    // Perform communication with client
                    try (BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                         PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true)) {

                        String message;
                        while ((message = in.readLine()) != null) {
                            System.out.println("Received from client: " + message);
                            out.println("Server received: " + message);
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package client;

import javax.net.ssl.*;
import java.io.*;
import java.security.*;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class SSLClient {
    private static final String SERVER_HOST = "localhost";
    private static final int SERVER_PORT = 1234;

    public static void main(String[] args) {
        try {
            // Create trust manager that trusts all certificates
            TrustManager[] trustManagers = new TrustManager[]{
                new X509TrustManager() {
                    @Override
                    public void checkClientTrusted(X509Certificate[] x509Certificates, String s)
                      throws CertificateException {
                    }

                    @Override
                    public void checkServerTrusted(X509Certificate[] x509Certificates, String s)
                      throws CertificateException {
                    }

                    @Override
                    public X509Certificate[] getAcceptedIssuers() {
                        return new X509Certificate[0];
                    }
                }
            };

            // Create SSL context
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustManagers, new SecureRandom());

            // Create SSL socket factory
            SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

            // Create SSL socket
            try (SSLSocket socket = (SSLSocket) sslSocketFactory.createSocket(SERVER_HOST, SERVER_PORT);
                 BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                 PrintWriter out = new PrintWriter(socket.getOutputStream(), true)) {

                // Send a message to the server
                out.println("Hello, Server!");

                // Read the response from the server
                String response = in.readLine();
                System.out.println("Received from server: " + response);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}