QUOTATION SERVER AND CLIENT

A simple program of server and client where the server sent a good quote to the connected client immediately after the connection(as welcoming).

Multiple Clients are handled using java multithreading concept, Used UDP datagram sockets, and text where quotes are stored.

	import java.io.*;
	import java.net.*;
	import java.util.*;
	public class QuoteClient {
	public static void main(String[] args) throws IOException {
	if (args.length != 1) {
	System.out.println("Usage: java QuoteClient <hostname>");
	return;
	}
	// get a datagram socket
	DatagramSocket socket = new DatagramSocket();
	// send request
	byte[] buf = new byte[256];
	InetAddress address = InetAddress.getByName(args[0]);
	DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 4445);
	socket.send(packet);
	// get response
	packet = new DatagramPacket(buf, buf.length);
	socket.receive(packet);
	// display response
	String received = new String(packet.getData(), 0, packet.getLength());
	System.out.println("Quote of the Moment: " + received);
	socket.close();
	}
	}

view raw QuoteClient.java hosted with ❤ by GitHub

	import java.io.*;

	public class QuoteServer {
	public static void main(String[] args) throws IOException {
	new QuoteServerThread().start();
	}
	}

view raw QuoteServer.java hosted with ❤ by GitHub

	import java.io.*;
	import java.net.*;
	import java.util.*;
	public class QuoteServerThread extends Thread {
	protected DatagramSocket socket = null;
	protected BufferedReader in = null;
	protected boolean moreQuotes = true;
	public QuoteServerThread() throws IOException {
	this("QuoteServerThread");
	}
	public QuoteServerThread(String name) throws IOException {
	super(name);
	socket = new DatagramSocket(4445);
	try {
	in = new BufferedReader(new FileReader("one-liners.txt"));
	} catch (FileNotFoundException e) {
	System.err.println("Could not open quote file. Serving time instead.");
	}
	}
	public void run() {
	while (moreQuotes) {
	try {
	byte[] buf = new byte[256];
	// receive request
	DatagramPacket packet = new DatagramPacket(buf, buf.length);
	socket.receive(packet);
	// figure out response
	String dString = null;
	if (in == null)
	dString = new Date().toString();
	else
	dString = getNextQuote();
	buf = dString.getBytes();
	// send the response to the client at "address" and "port"
	InetAddress address = packet.getAddress();
	int port = packet.getPort();
	packet = new DatagramPacket(buf, buf.length, address, port);
	socket.send(packet);
	} catch (IOException e) {
	e.printStackTrace();
	moreQuotes = false;
	}
	}
	socket.close();
	}
	protected String getNextQuote() {
	String returnValue = null;
	try {
	if ((returnValue = in.readLine()) == null) {
	in.close();
	moreQuotes = false;
	returnValue = "No more quotes. Goodbye.";
	}
	} catch (IOException e) {
	returnValue = "IOException occurred in server.";
	}
	return returnValue;
	}
	}

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