Create chat application using either TCP or UDP protocol.

Practical : 1

Subject : Advanced Java

Aim : Create chat application using either TCP or UDP protocol.

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1. Program: Using TCP

Server Code: 
Download :

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import java.io.*;

import java.net.*;

import java.util.Scanner;

public class Server {

            public static void main(String[] args) throws Exception

            {

                        ServerSocketss=new ServerSocket(7888);

                        Socket s=ss.accept();

                        DataInputStream din=new DataInputStream(s.getInputStream());

                        String str;

                        str=din.readUTF();

                        System.out.println("Client:\t"+str);

                        DataOutputStreamdout=new DataOutputStream(s.getOutputStream());

                        DataInputStreammsg=new DataInputStream(System.in);

                        while(true)

                        {

                                    str=din.readUTF();

                                    System.out.print("Client:\t"+str);

                                    System.out.print("Server:\t");

                                    str=msg.readLine();

dout.writeUTF(str);

                        }

            }

}

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Client Code: 
Download : Client.java

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import java.io.*;

import java.net.Socket;

import java.util.Scanner;

public class Client

{

            public static void main(String[] args) throws Exception

            {

                        Socket s=new Socket("127.0.0.1",7888);

                        if(s.isConnected())

                        {

                                    System.out.println("Connected to server");

                        }

                        DataInputStreammsg=new DataInputStream(System.in);

                        String str="Start Chat..............................................................................................";

                        DataOutputStreamdout=new DataOutputStream(s.getOutputStream());

                        dout.writeUTF(str);

                        System.out.println(str);

                        DataInputStream din=new DataInputStream(s.getInputStream());

                        while(true)

                        {

                                    System.out.print("Client:\t");

                                    str=msg.readLine();

                                    dout.writeUTF(str+"\n");

                                    str=din.readUTF();

                                    System.out.println("Server:\t"+str);

                        }

            }

}

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Output:

Server

Client

2. Program: Using UDP

Server Code: 
Download : Server.java

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import java.io.*;

import java.net.*;

public class Server {

            public static void main(String[] args) throws Exception

            {

                        DatagramSocket socket=new DatagramSocket(9861);

                        byte receiveByte[]=new byte[1024];

                        byte sendByte[]=new byte[1024];

                        while(true)

                        {

                                    //data receiving

                                    DatagramPacketreceivePacket=new DatagramPacket(receiveByte,receiveByte.length);

                                    socket.receive(receivePacket);

                                    String receiveStr=new String(receivePacket.getData());

                                    receiveStr=receiveStr.trim();

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

                                   

                                    //data sending

                                    DataInputStream din=new DataInputStream(System.in);

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

                                    String sendStr=din.readLine();

                                    sendByte=sendStr.getBytes();

                                    InetAddressip=receivePacket.getAddress();

                                    int port=receivePacket.getPort();

                                    DatagramPacketsendPacket=new DatagramPacket(sendByte,sendByte.length,ip,port);

                                    socket.send(sendPacket);

                        }

            }

}

--------------------------------------------------------------------------------

Client Code: 
Download : Client.java

--------------------------------------------------------------------------------

import java.net.*;

import java.io.*;

public class Client {

            public static void main(String[] args) throws Exception

            {

                        DatagramSocket socket=new DatagramSocket();

                        InetAddressip=InetAddress.getLocalHost();

                        byte sendByte[]=new byte[1024];

                        byte receiveByte[]=new byte[1024];

                        while(true)

                        {

                                    //Data Sending

                                    DataInputStream din=new DataInputStream(System.in);

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

                                    String sendStr=din.readLine();

                                    sendByte=sendStr.getBytes();

                                    DatagramPacketsendPacket=new DatagramPacket(sendByte,sendByte.length,ip,9861);

                                    socket.send(sendPacket);

                                   

                                    //Data Receiving

                                    DatagramPacketreceivePacket=new DatagramPacket(receiveByte,receiveByte.length);

                                    socket.receive(receivePacket);

                                    String receiveStr=new String(receivePacket.getData());

                                    receiveStr=receiveStr.trim();

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

                        }

            }

}

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Output:

Server

Client

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