Java Networking

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Java Networking allows Java applications to exchange data between different devices via TCP/IP network connections.

 

The Java socket programming framework enables data transmission between multiple computing devices.

java-networking
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The java.net package provides Java with straightforward capabilities to manage networking tasks.

Types of Communication

TCP (Transmission Control Protocol)

  • Reliable and connection-oriented
  • Classes: Socket, ServerSocket

UDP (User Datagram Protocol)

  • Fast, but connectionless and unreliable
  • Classes: DatagramSocket, DatagramPacket

Example

Server Code

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

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(5000);
        System.out.println("Server is waiting...");

        Socket socket = serverSocket.accept();  // Accept client
        DataInputStream dis = new DataInputStream(socket.getInputStream());
        String message = dis.readUTF();

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

        dis.close();
        socket.close();
        serverSocket.close();
    }
}

Client Code

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

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("localhost", 5000);
        DataOutputStream dos = new DataOutputStream(socket.getOutputStream());

        dos.writeUTF("Hello, Server!");
        dos.close();
        socket.close();
    }
}

Output

Server is waiting...
Client says: Hello, Server!
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