الشبكات في Java (Networking)

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

try (Socket socket = new Socket("localhost", 8080);
     PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
     BufferedReader in = new BufferedReader(
         new InputStreamReader(socket.getInputStream()))) {

    out.println("مرحبًا يا خادم");
    String response = in.readLine();
    System.out.println("الرد: " + response);
}

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

try (ServerSocket server = new ServerSocket(8080)) {
    System.out.println("الخادم يعمل على البورت 8080...");

    while (true) {
        Socket client = server.accept(); // ينتظر اتصال عميل
        new Thread(() -> handleClient(client)).start();
    }
}

static void handleClient(Socket client) {
    try (BufferedReader in = new BufferedReader(
             new InputStreamReader(client.getInputStream()));
         PrintWriter out = new PrintWriter(client.getOutputStream(), true)) {

        String msg = in.readLine();
        System.out.println("وصل: " + msg);
        out.println("تم الاستلام: " + msg);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

// الخادم
try (ServerSocket server = new ServerSocket(9090)) {
    while (true) {
        Socket client = server.accept();
        new Thread(() -> {
            try (BufferedReader in = new BufferedReader(
                     new InputStreamReader(client.getInputStream()));
                 PrintWriter out = new PrintWriter(client.getOutputStream(), true)) {

                String line;
                while ((line = in.readLine()) != null) {
                    String[] parts = line.split("\\+");
                    if (parts.length == 2) {
                        int a = Integer.parseInt(parts[0].trim());
                        int b = Integer.parseInt(parts[1].trim());
                        out.println("النتيجة: " + (a + b));
                    }
                }
            } catch (IOException e) { e.printStackTrace(); }
        }).start();
    }
}

import java.net.URL;
import java.net.HttpURLConnection;
import java.io.*;

URL url = new URL("https://api.example.com/data");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");

try (BufferedReader reader = new BufferedReader(
         new InputStreamReader(conn.getInputStream()))) {
    StringBuilder response = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
        response.append(line);
    }
    System.out.println(response);
}

import java.net.DatagramSocket;
import java.net.DatagramPacket;
import java.net.InetAddress;

// إرسال
DatagramSocket socket = new DatagramSocket();
byte[] data = "مرحبًا".getBytes();
DatagramPacket packet = new DatagramPacket(
    data, data.length, InetAddress.getByName("localhost"), 9999);
socket.send(packet);

// استقبال
DatagramSocket server = new DatagramSocket(9999);
byte[] buffer = new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
server.receive(packet);
String msg = new String(packet.getData(), 0, packet.getLength());