Echo client and Echo server

Aim

To write a java program for application using TCPSockets Links

Algorithm

1.Start the program.

2.Get the frame size from the user

3.To create the framebased on the user request.

4.To send frames to server from the client side.

5.If your frames reach the server it will send ACK signal to client otherwise it will send NACK signal to client.

6.Stop the program

EchoServer.java

import java.net.*;

import java.io.*;

public class EServer

{

public static void main(String args[])

{

ServerSocket s=null;

String line;

DataInputStream is;

PrintStream ps;

Socket c=null;

try

{

s=new ServerSocket(9000);

}

catch(IOException e)

{

System.out.println(e);

}

try

{

c=s.accept();

is=new DataInputStream(c.getInputStream());

ps=new PrintStream(c.getOutputStream());

while(true)

{

line=is.readLine();

ps.println(line);

}

}

catch(IOException e)

{

System.out.println(e);

}

}

}

EClient.java

import java.net.*;

import java.io.*;

public class EClient

{

public static void main(String arg[])

{

Socket c=null;

String line;

DataInputStream is,is1;

PrintStream os;

try

{

InetAddress ia = InetAddress.getLocalHost();

c=new Socket(ia,9000);

}

catch(IOException e)

{

System.out.println(e);

}

try

{

os=new PrintStream(c.getOutputStream());

is=new DataInputStream(System.in);

is1=new DataInputStream(c.getInputStream());

while(true)

{

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

line=is.readLine();

os.println(line);

System.out.println("Server:" + is1.readLine());

}}

catch(IOException e)

{

System.out.println("Socket Closed!");

}

}

}

Output

Server

C:\Program Files\Java\jdk1.5.0\bin>javac EServer.java

Note: EServer.java uses or overrides a deprecated API.

Note: Recompile with -deprecation for details.

C:\Program Files\Java\jdk1.5.0\bin>java EServer

C:\Program Files\Java\jdk1.5.0\bin>

Client

C:\Program Files\Java\jdk1.5.0\bin>javac EClient.java

Note: EClient.java uses or overrides a deprecated API.

Note: Recompile with -deprecation for details.

C:\Program Files\Java\jdk1.5.0\bin>java EClient

Client:

Hai Server

Server:Hai Server

Client:

Hello

Server:Hello

Client:

end

Server:end

Client:

ds

Socket Closed!