java program for Client-Server Program using TCP/IP

Program : Client-Server Program using TCP/IP
By : Kapil Lohia

Program 1:

 
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();
	}
}

Program 2

 
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();
	}
}

39 Responses to “java program for Client-Server Program using TCP/IP”

chaitra October 27, 2010

java program for Client-Server Program using TCP/IP
Rana April 22, 2011

firstly thank you so much for the help ! this is really a wonderful helpful site for the students. I want to stay tuned with ELECTROFRIENDS for lifelong. once again ,thank you so very much!
gagandeep May 29, 2011

thanks dear….
durgesh July 25, 2011

thnx for the help !!!!!
rohit July 25, 2011

its really helpfull
Mike Acker July 26, 2011

Very nice post.I was seeking like this post Green Life
r.thilagavathy August 22, 2011

thank u sir
mohan September 7, 2011

good job.and thanks
vignesh January 4, 2012

thanks ……. really it is helpful
DEEPIKA.J January 4, 2012

Hi………. not even single error in ur codes…. thank u very much!!!! REALLY AWESOME!!!!
golu_tera_molu January 31, 2012

bakwas… whr to give the ip address and port num.
hum_randi_hai January 31, 2012

aa bacho log randi baji karo.. inn sab main kya pada hai..
randi khane main jo maja hai yaha nahi
jayachandra March 19, 2012

In the above example we are just replying from server only, can you make it how to reply from client also.
jayachandra March 19, 2012

In the above example we are just replying from server only, can you make it how to reply from client side.
sneha July 9, 2012

nice
sneha July 9, 2012

nadkhullaaaaaaaaaa
viktorpark July 17, 2012

This site is not even responding to the viewer’s reply…..plez do so,coz it will be of great help to us..
well i also found that we cant reply frm client side….HELP NEEDED! urgent.
rishiraj August 8, 2012

very nice….
thanks!!!!
SANJUBABA August 23, 2012

Nad ny Karycha
Susrshsan Neupane August 31, 2012

very nice tutorial..if i need to use this type program in network what i will be do ?
dear ,writer please write chatting system in GUI mode also