Practical 16: Write a program to implement chat Server using ServerSocket and Socket class. ~ Coding Atharva

1) Write a program to check credentials of users (Client will send user id and password to server and server will authenticate the client using equals() ).
Ans:
Server:

/*
    Client Will Send UserID and Password to Server will Authenticate the client using equals()
*/

import java.net.ServerSocket;
import java.net.Socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.InputStreamReader;

public class ValidateServer
{
    public static void main(String[] args)  throws IOException
    {    
        ServerSocket s = new ServerSocket(2019);
        System.out.println("Server Started, waiting for client");
        
        Socket s1 = s.accept();

        BufferedReader br = new BufferedReader(
            new InputStreamReader(s1.getInputStream())
        );
        
        String user = br.readLine();
        String pass = br.readLine();

        OutputStream out = s1.getOutputStream();
        PrintStream ps  = new PrintStream(out);

        if(user.equals("abc") && pass.equals("1234"))
        {
            ps.println("Validate Successfully");
        }
        else
        {
            ps.println("Validate Un-Successfull");
        }
    }
}

Client:

import java.net.Socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;

public class ValidateClient 
{
    public static void main(String[] args) throws IOException {
        Socket s = new Socket("localhost" , 2019);
        
        BufferedReader br = new BufferedReader(
            new InputStreamReader(System.in)
        );

        System.out.print("Enter Username and Password: ");
        String user = br.readLine();
        String pass = br.readLine();

        OutputStream os = s.getOutputStream();
        PrintStream ps = new PrintStream(os);

        ps.println(user);
        ps.println(pass);

        BufferedReader br1 = new BufferedReader(
         new InputStreamReader(s.getInputStream())
        );

        String res = br1.readLine();

        System.out.println(res);
    }
}

Output:

Server:

Client:

2) Write a program using Socket and ServerSocket to create Chat Application.
Ans:
ServerSide:

import java.net.ServerSocket;
import java.net.Socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.InputStreamReader;

public class ServerSide
{
    public static void main(String[] args) throws IOException 
    {
        ServerSocket s = new ServerSocket(2019);     
        System.out.println("Server Started, waiting for client");
        
        Socket s1 = s.accept();

        // Client Send
        BufferedReader br = new BufferedReader(
            new InputStreamReader(s1.getInputStream())
        );
        
        OutputStream out = s1.getOutputStream();
        PrintStream ps  = new PrintStream(out);

        BufferedReader br1 = new BufferedReader(
            new InputStreamReader(System.in)
        );

        do{         
            String res = br.readLine();

            System.out.println("Client Send: "+res);
             
            System.out.print("Server: ");
            String msg = br1.readLine();
            System.out.print("\n\n");
            ps.println(msg);

        }
        while(true);
    }
}

ClientSide:

import java.net.Socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;


public class ClientSice
{
    public static void main(String[] args) throws IOException {     
        Socket s = new Socket("localhost",2019);

        System.out.println("Client Started, waiting for server response..");
        
        BufferedReader br = new BufferedReader(
            new InputStreamReader(System.in)
        );

        OutputStream os = s.getOutputStream();


        BufferedReader br1 = new BufferedReader(
            new InputStreamReader(s.getInputStream())
            );

        PrintStream ps = new PrintStream(os);

        do{
            System.out.print("Client: ");
            String msg = br.readLine();

            ps.println(msg);

            String res = br1.readLine();

            System.out.println("Server Send:"+res+"\n\n");
        }
        while(true);
        
    }
}

Output:

Practical 16: Write a program to implement chat Server using ServerSocket and Socket class.

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