Analisis dan pelaksanaan protokol rangkaian asas JAVA

import java.io.*;
import java.net.*;

public class TCPClient {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("127.0.0.1", 8888);
            OutputStream out = socket.getOutputStream();
            PrintWriter writer = new PrintWriter(out);
            writer.println("Hello, server");
            writer.flush();

            InputStream in = socket.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            String response = reader.readLine();
            System.out.println("Server response: " + response);

            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.*;
import java.net.*;

public class UDPServer {
    public static void main(String[] args) {
        try {
            DatagramSocket serverSocket = new DatagramSocket(9876);
            byte[] receiveData = new byte[1024];

            DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
            serverSocket.receive(receivePacket);

            String sentence = new String(receivePacket.getData(), 0, receivePacket.getLength());
            InetAddress IPAddress = receivePacket.getAddress();
            int port = receivePacket.getPort();

            System.out.println("Client message: " + sentence);

            String response = "Hello, client";
            byte[] sendData = response.getBytes();
            DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);

            serverSocket.send(sendPacket);
            serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.*;
import java.net.*;

public class HTTPClient {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://www.example.com");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");

            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = reader.readLine()) != null) {
                response.append(inputLine);
            }
            reader.close();

            System.out.println(response.toString());
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}