Java Program: Client - Server Program using TCP/IP

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



class tcpip_client
{

public static void main(String args[]) throws IOException
{
Socket s=null;
BufferedReader b=null;

try
{
s=new Socket(InetAddress.getLocalHost(),98);
b=new BufferedReader(new InputStreamReader(s.getInputStream()));
}

catch(UnknownHostException u)
{
System.err.println("I don't know host");
System.exit(0);
}

String inp;
while((inp=b.readLine())!=null)
{
System.out.println(inp);
}
b.close();
s.close();
}
}


Client-Server Program using TCP/IP


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



class tcpip_server
{

public static void main(String args[]) throws IOException
{
ServerSocket n1=null;

try
{
n1=new ServerSocket(98);
}

catch(IOException e)
{
System.err.println("Port 98 could not be found");
System.exit(1);
}


Socket c=null;

try
{
c=n1.accept();

System.out.println("Connection from "+c);
}

catch(IOException e)
{
System.out.println("Accept failed");
System.exit(1);
}

PrintWriter out=new PrintWriter(c.getOutputStream(),true);
BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));

String n;

BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Ready to type now");
while((n=sin.readLine())!=null)
{
out.println(n);
}

out.close();
c.close();
n1.close();

}

}