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Rustam-ZRustam-Z
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‎java-networking/Client.java‎

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import java.io.*;
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import java.net.*;
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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public class Client extends JFrame {
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// Text field for receiving radius
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private JTextField jtf = new JTextField();
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// Text area to display contents
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private JTextArea jta = new JTextArea();
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// IO streams
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private DataOutputStream toServer;
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private DataInputStream fromServer;
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public static void main(String[] args) {
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new Client();
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}
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public Client() {
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// Panel p to hold the label and text field
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JPanel p = new JPanel();
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p.setLayout(new BorderLayout());
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p.add(new JLabel("Enter radius"), BorderLayout.WEST);
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p.add(jtf, BorderLayout.CENTER);
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jtf.setHorizontalAlignment(JTextField.RIGHT);
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setLayout(new BorderLayout());
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add(p, BorderLayout.NORTH);
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add(new JScrollPane(jta), BorderLayout.CENTER);
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jtf.addActionListener(new ButtonListener()); // Register listener
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setTitle("Client");
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setSize(500, 300);
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setVisible(true); // It is necessary to show the frame here!
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try {
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// Create a socket to connect to the server
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Socket socket = new Socket("localhost", 8000);
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// Socket socket = new Socket("130.254.204.36", 8000);
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// Socket socket = new Socket("drake.Armstrong.edu", 8000);
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// Create an input stream to receive data from the server
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fromServer = new DataInputStream(
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socket.getInputStream());
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// Create an output stream to send data to the server
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toServer =
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new DataOutputStream(socket.getOutputStream());
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}
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catch (IOException ex) {
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jta.append(ex.toString() + '\n');
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}
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}
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private class ButtonListener implements ActionListener {
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public void actionPerformed(ActionEvent e) {
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try {
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// Get the radius from the text field
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double radius = Double.parseDouble(jtf.getText().trim());
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// Send the radius to the server
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toServer.writeDouble(radius);
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toServer.flush();
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// Get area from the server
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double area = fromServer.readDouble();
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// Display to the text area
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jta.append("Radius is " + radius + "\n");
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jta.append("Area received from the server is "
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+ area + '\n');
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}
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catch (IOException ex) {
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System.err.println(ex);
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}
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}
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}
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}

‎java-networking/ClientAB.java‎

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import java.io.*;
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import java.net.*;
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import java.util.Scanner;
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public class ClientAB {
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private DataOutputStream toServer;
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private DataInputStream fromServer;
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public static void main(String[] args) {
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new ClientAB();
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}
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public ClientAB() {
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try {
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// Create a socket to connect to the server
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Socket socket = new Socket("localhost", 8000);
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Scanner sc = new Scanner(System.in);
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System.out.println("Please Enter radius");
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Double radius = sc.nextDouble();
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while(radius != 0){
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// Create an input stream to receive data from the server
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fromServer = new DataInputStream(socket.getInputStream());
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// Create an output stream to send data to the server
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toServer = new DataOutputStream(socket.getOutputStream());
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toServer.writeDouble(radius);
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toServer.flush();
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double area = fromServer.readDouble();
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System.out.println("Please area of cirlce" + area);
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System.out.println("Please Enter radius");
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radius = sc.nextDouble();
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}
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} catch (IOException ex) {
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System.out.println(ex.toString() + '\n');
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}
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}
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}

‎java-networking/InetDemo.java‎

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import java.io.*;
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import java.net.*;
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public class InetDemo {
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public static void main(String[] args) {
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try{
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InetAddress ip=InetAddress.getByName("www.google.com");
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System.out.println("Host Name: "+ip.getHostName());
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System.out.println("IP Address: "+ip.getHostAddress());
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}
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catch(Exception e) {
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System.out.println(e);
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}
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}
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}

‎java-networking/Server.java‎

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import java.io.*;
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import java.net.*;
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import java.util.*;
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import java.awt.*;
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import javax.swing.*;
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public class Server extends JFrame {
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// Text area for displaying contents
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private JTextArea jta = new JTextArea();
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public static void main(String[] args) {
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new Server();
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}
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public Server() {
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// Place text area on the frame
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setLayout(new BorderLayout());
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add(new JScrollPane(jta), BorderLayout.CENTER);
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setTitle("Server");
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setSize(500, 300);
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setVisible(true); // It is necessary to show the frame here!
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try {
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// Create a server socket
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ServerSocket serverSocket = new ServerSocket(8000);
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jta.append("Server started at " + new Date() + '\n');
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// Listen for a connection request
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Socket socket = serverSocket.accept();
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// Create data input and output streams
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DataInputStream inputFromClient = new DataInputStream(
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socket.getInputStream());
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DataOutputStream outputToClient = new DataOutputStream(
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socket.getOutputStream());
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while (true) {
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// Receive radius from the client
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double radius = inputFromClient.readDouble();
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// Compute area
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double area = radius * radius * Math.PI;
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// Send area back to the client
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outputToClient.writeDouble(area);
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jta.append("Radius received from client: " + radius + '\n');
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jta.append("Area found: " + area + '\n');
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}
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}
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catch(IOException ex) {
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System.err.println(ex);
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}
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}
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}

‎java-networking/ServerAB.java‎

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import java.io.*;
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import java.net.*;
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import java.util.*;
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public class ServerAB {
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public static void main(String[] args) {
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new ServerAB();
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}
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public ServerAB() { // constructor
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try {
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// Create a server socket
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ServerSocket serverSocket = new ServerSocket(8000);
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System.out.println("Server started at " + new Date() + '\n');
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// Listen for a connection request
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Socket socket = serverSocket.accept();
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// Create data input and output streams
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DataInputStream inputFromClient = new DataInputStream(
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socket.getInputStream());
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DataOutputStream outputToClient = new DataOutputStream(
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socket.getOutputStream());
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while (true) {
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// Receive radius from the client
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double radius = inputFromClient.readDouble();
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InetAddress ip = socket.getInetAddress();
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System.out.println("Host Name: " + ip.getHostName());
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System.out.println("IP Address: " + ip.getHostAddress());
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System.out.println("We have received radius value "+ radius);
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// Compute area
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double area = radius * radius * Math.PI;
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// Send area back to the client
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outputToClient.writeDouble(area);
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}
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} catch(IOException ex) {
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System.err.println(ex);
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}
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}
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}

‎java-networking/URLDemo.java‎

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/*
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The Java URL class represents an URL.
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URL is an acronym for Uniform Resource Locator.
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It points to a resource on the World Wide Web.
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A URL contains many information:
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Protocol:
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Server name or IP Address:
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Port Number: It is an optional attribute.
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File Name or directory name:
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Constructors of Java URL class
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URL(String spec)
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Creates an instance of a URL from the String representation.
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URL(String protocol, String host, int port, String file)
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Creates an instance of a URL from the given protocol, host, port number, and file.
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URL(String protocol, String host, int port, String file, URLStreamHandler handler)
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Creates an instance of a URL from the given protocol, host, port number, file, and handler.
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URL(String protocol, String host, String file)
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Creates an instance of a URL from the given protocol name, host name, and file name.
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URL(URL context, String spec)
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Creates an instance of a URL by parsing the given spec within a specified context.
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URL(URL context, String spec, URLStreamHandler handler)
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Creates an instance of a URL by parsing the given spec with the specified handler within a given context.
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Method Description
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public String getProtocol() it returns the protocol of the URL.
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public String getHost() it returns the host name of the URL.
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public String getPort() it returns the Port Number of the URL.
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public String getFile() it returns the file name of the URL.
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public String getAuthority() it returns the authority of the URL.
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public String toString() it returns the string representation of the URL.
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public String getQuery() it returns the query string of the URL.
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public String getDefaultPort() it returns the default port of the URL.
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public URLConnection openConnection() it returns the instance of URLConnection i.e. associated with this URL.
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public boolean equals(Object obj) it compares the URL with the given object.
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public Object getContent() it returns the content of the URL.
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public String getRef() it returns the anchor or reference of the URL.
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public URI toURI() it returns a URI of the URL.
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*/
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//URLDemo.java
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import java.net.*;
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public class URLDemo {
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public static void main(String[] args) {
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try{
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URL url=new URL("https://www.google.com/search?q=javatpoint&oq=javatpoint&sourceid=chrome&ie=UTF-8");
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System.out.println("Protocol: "+url.getProtocol());
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System.out.println("Host Name: "+url.getHost());
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System.out.println("Port Number: "+url.getPort());
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System.out.println("Default Port Number: "+url.getDefaultPort());
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System.out.println("Query String: "+url.getQuery());
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System.out.println("Path: "+url.getPath());
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System.out.println("File: "+url.getFile());
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}
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catch(Exception e) {
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System.out.println(e);
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}
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}
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}

‎lab-09-networking/Client.java‎

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/**
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* Student: Rustam Zokirov
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* ID: U1910049
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* Lab #9: Networking, socket programming
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* Client side
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*/
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// import libraries we need
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import java.io.*; // DataInputStream/DataOutputStream
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import java.net.*; // ServerSocket/Socket
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import java.util.Scanner;
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public class Client {
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private DataOutputStream toServer;
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private DataInputStream fromServer;
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public static void main(String[] args) {
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new Client();
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}
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public Client() { // constructor
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try {
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// Create a socket to connect to the server
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Socket socket = new Socket("localhost", 8000);
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Scanner sc = new Scanner(System.in);
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String message;
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do {
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System.out.print("Please enter a message (0 = exit): ");
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message = sc.next();
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if (message.compareTo("0") == 0)
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break;
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// Create an input stream to receive data from the server
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fromServer = new DataInputStream(socket.getInputStream());
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// Create an output stream to send data to the server
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toServer = new DataOutputStream(socket.getOutputStream());
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toServer.writeUTF(message);
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toServer.flush();
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String convertedMessage = fromServer.readUTF();
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System.out.println("Converted message: " + convertedMessage);
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System.out.println();
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} while(true);
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}
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catch (IOException ex) {
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System.out.println(ex.toString() + '\n');
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}
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}
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}

‎lab-09-networking/Lab_-09_-_APJ_-_Network_Programming.docx‎

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