Program for Client - Server communication to perform Chat operation using UDP in Java

Program for Client - Server communication to perform Chat operation using UDP in Java

client

import java.io.*;

import java.net.*;

import java.util.*;

class Client13

{

            public static void main(String args[])

            {

            try

            {

                        DatagramSocket client=new DatagramSocket();

                        while(true)

                        {

                        InetAddress addr=InetAddress.getByName("127.0.0.1");

                        byte[] sendbyte=new byte[1024];

                        byte[] receivebyte=new byte[1024];

                        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));

                        System.out.print("You:");

                        String str=in.readLine();

                        sendbyte=str.getBytes();

                        DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr,1309);

                        client.send(sender);

                        if(str.equals("bye") )

                        {

                                    break;

                        }

                        DatagramPacket receiver=new DatagramPacket(receivebyte,receivebyte.length);

                        client.receive(receiver);

                        String s=new String(receiver.getData());

                        String s1=s.trim();

                        System.out.println("Server:"+s1);

                        if(s1.equals("bye") )

                        {

                                    break;

                        }         

                        }

                        client.close();

            }

            catch(Exception e)

            {

                        System.out.println(e);

            }

            }

}

Server

import java.io.*;

import java.net.*;

import java.util.*;

class Server13

{

            public static void main(String args[])

            {

            try

            {

                        DatagramSocket server=new DatagramSocket(1309);

                        while(true)

                        {

                                    byte[] sendbyte=new byte[1024];

                                    byte[] receivebyte=new byte[1024];

                                    DatagramPacket receiver=new DatagramPacket(receivebyte,receivebyte.length);

                                    server.receive(receiver);

                                    String str=new String(receiver.getData());

                                    String str2=str.trim();

                                    System.out.println("Client:"+str2);

                                    if(str2.equals("bye"))

                                    {

                                               

                                                break;

                                    }                     

                                    InetAddress addr=receiver.getAddress();

                                    int port=receiver.getPort();

                                    BufferedReader in=new BufferedReader(new InputStreamReader(System.in));

                                    System.out.print("You:");

                                    String str1=in.readLine();

                                    sendbyte=str1.getBytes();

                                    DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr,port);

                                    server.send(sender);

                                    if(str1.equals("bye"))

                                    {

                                                break;

                                    }         

                        }

                        server.close();

            }

            catch(Exception e)

            {

                        System.out.println(e);

            }s}

}

Output

E:\networks>javac Client13.java

E:\networks>javac Server13.java

E:\networks>java Client13

You:hai

Server:hello

You:how r u

Server:fine

You:u

Server:bye

E:\networks>java Server13

Client:hai

You:hello

Client:how r u

You:fine

Client:u

You:bye