Java Program for client-server chat

client code ..

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

public class Client {

public static void main(String[] ar) {

 int serverPort = 6666; // make sure you give the port number on which the server is listening.
 String address = "127.0.0.1"; // this is the IP address of the server program's computer. // the address given here means "the same computer as the client"


try {
 InetAddress ipAddress = InetAddress.getByName(address); // create an object that represents the above IP address.
 System.out.println("Any of you heard of a socket with IP address " + address + " and port " + serverPort + "?");


 Socket socket = new Socket(ipAddress, serverPort); // create a socket with the server's IP address and server's port.
 System.out.println("Yes! I just got hold of the program.");


 // Get the input and output streams of the socket, so that you can receive and send data to the client.
 InputStream sin = socket.getInputStream();
 OutputStream sout = socket.getOutputStream();

 // Just converting them to different streams, so that string handling becomes easier.
 DataInputStream in = new DataInputStream(sin);
 DataOutputStream out = new DataOutputStream(sout);

// Create a stream to read from the keyboard.
 BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));

 String line = null;
 System.out.println("Type in something and press enter. Will send it to the server and tell ya what it thinks.");
 System.out.println();

 while(true) {
 line = keyboard.readLine(); // wait for the user to type in something and press enter.

 System.out.println("Sending this line to the server...");
 out.writeUTF(line); // send the above line to the server.
 out.flush(); // flush the stream to ensure that the data reaches the other end.
 line = in.readUTF(); // wait for the server to send a line of text.


 System.out.println("The server was very polite. It sent me this : " + line);
 System.out.println("Looks like the server is pleased with us. Go ahead and enter more lines.");
 System.out.println();
 }
 } catch(Exception x) {
 x.printStackTrace();
 }
 }
 }

Server Code - 

import java.net.*;

import java.io.*;

public class Server {

public static void main(String[] ar) {

int port = 6666; // just a random port. make sure you enter something between 1025 and 65535.

 try {

 ServerSocket ss = new ServerSocket(port); // create a server socket and bind it to the above port number.

 System.out.println("Waiting for a client...");

 Socket socket = ss.accept(); // make the server listen for a connection, and let you know when it gets one.

System.out.println("Got a client :) ... Finally, someone saw me through all the cover!");

 System.out.println();

 // Get the input and output streams of the socket, so that you can receive and send data to the client.

 InputStream sin = socket.getInputStream();

 OutputStream sout = socket.getOutputStream();

// Just converting them to different streams, so that string handling becomes easier.

 DataInputStream in = new DataInputStream(sin);

 DataOutputStream out = new DataOutputStream(sout);

 String line = null;

 while(true) {

 line = in.readUTF(); // wait for the client to send a line of text.

 System.out.println("The dumb client just sent me this line : " + line);

 System.out.println("I'm sending it back...");

 out.writeUTF(line); // send the same line back to the client.

 out.flush(); // flush the stream to ensure that the data reaches the other end

 System.out.println("Waiting for the next line...");

 System.out.println();

 }

 } catch(Exception x) {

 x.printStackTrace();

 }

 }

 }