How to Handle Large Data Transfers Efficiently in Java Networking?

package server;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) {
        // Define the port to listen on
        int port = 9999; // Choose any available port
        
        // Define the file path to save the received file
        String filePath = "server_received_file.txt";

        try (ServerSocket serverSocket = new ServerSocket(port)) 
        {
            System.out.println("Server waiting for client...");
            
            while (true) {
                // Accept the client connection
                Socket socket = serverSocket.accept();
                System.out.println("Client connected.");

                // Set up input stream to receive data from client
                DataInputStream dis = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
                
                // Set up output stream to write received data to file
                FileOutputStream fos = new FileOutputStream(filePath);

                // Read data from input stream and write to file
                byte[] buffer = new byte[4096];
                int bytesRead;
                while ((bytesRead = dis.read(buffer)) != -1) {
                    fos.write(buffer, 0, bytesRead);
                }

                System.out.println("File received successfully.");

                // Close streams and socket
                fos.close();
                dis.close();
                socket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package client;

import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.Socket;

public class Client {
    public static void main(String[] args) {
        // Define the server's IP address
        String serverAddress = "localhost"; // Change to the server's IP address if it's on a different machine
        
        // Define the port to connect to on the server
        int port = 9999; // Use the same port as the server
        
        // Define the file path of the file to send
        String filePath = "large_file_to_send.txt";

        try (Socket socket = new Socket(serverAddress, port)) 
        {
            System.out.println("Connected to server.");
            System.out.println("Sending file...");

            // Set up output stream to send data to server
            DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
            
            // Set up input stream to read data from file
            FileInputStream fis = new FileInputStream(filePath);

            // Read data from file and send to server
            byte[] buffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = fis.read(buffer)) != -1) {
                dos.write(buffer, 0, bytesRead);
            }

            dos.flush();
            System.out.println("File sent successfully.");

            // Close streams
            dos.close();
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}