TWO WAY COMMUNICATION USING TCP

Step 1 : Open 2 editors and write the coding separately for client and server.

Step2 : Include the  necessary   packages.

Step  3 : Create a new server socket in server side and storing the inputstream  in the buffered    

                   Reader.

Server Socket  ss = new  Server Socket(98);

Socket  s=  ss. Accept ();

BufferedReader  d = new BufferedReader(new  InputStreamReader (SyStepm.in));

Step  4 :  Print  the output stream  by using   print  writer.

PrintWriter  out=  new  PrintWriter(s.getOutputStream(),true);

Step 5 : Read the input and print the string  from the client until the string gets exit.

While(!(inp.equals(“exit”)))

{

String l= sin.readLine();

Out.println(l);

String inp=d.readLine();

}

Step 6 : Create a new socket in the client side.

Socket c= new Socket(InetAddress.getLocalhost(),98);

Step 7 : Print the outputstream and stored in buffered reader.

PrintWriter out=new Printwriter(c.getoutpustream(),true);

BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));

Step 8 : Save the program separately with the   java extensions.

Step 9 : Compile and execute the program.

 PROGRAM

SERVER

import java.io.*;

import java.net.*;

import java.lang.*;

class tcpc1

{

public static void main(String args[]) throws IOException

{

try

{

Socket ctsoc=new Socket("localhost",8000);

while(true)

{

BufferedReader in=new BufferedReader(new InputStreamReader(ctsoc.getInputStream()));

String str1=in.readLine();

SyStepm.out.println("Server:"+str1);

if(str1.equals("exit"))

{

ctsoc.close();

}

else

SyStepm.out.println("Client");

BufferedReader stdin=new BufferedReader(new InputStreamReader(SyStepm.in));

PrintWriter out=new PrintWriter(ctsoc.getOutputStream(),true);

String userinput=stdin.readLine();

out.println(userinput);

if(userinput.equals("exit"))

{

ctsoc.close();

}}}

catch(IOException se)

{

SyStepm.out.println("server disconnected...");

}}}

CLIENT

import java.io.*;

import java.net.*;

import java.lang.*;

class tcps1

{

public static void main(String args[])throws IOException

{

ServerSocket srsoc=new ServerSocket(8000);

Socket clientsoc=srsoc.accept();

while(true)

{

try{

SyStepm.out.println("Start:");

String ipln;

BufferedReader stdin=new BufferedReader(new InputStreamReader(SyStepm.in));

ipln=stdin.readLine();

PrintWriter out=new PrintWriter(clientsoc.getOutputStream(),true);

out.println(ipln);

if(ipln.equals("exit"))

{

clientsoc.close();

srsoc.close();

break;

}

BufferedReader in=new BufferedReader(new InputStreamReader(clientsoc.getInputStream()));

String str1=in.readLine();

if(str1.equals("exit"))

{

SyStepm.out.println("Client disconnected...");

clientsoc=srsoc.accept();

}else

{

SyStepm.out.println("Client:"+str1);

}}catch(IOException se)

{

SyStepm.out.println("Client not found...");

clientsoc=srsoc.accept();        

}}}}

OUTPUT

Server

C:\Users\User>cd C:\j2sdk1.4.2_08\bin

C:\j2sdk1.4.2_08\bin>javac tcps1.java

C:\j2sdk1.4.2_08\bin>java tcps1

Start:welcome to india

Client:thank you

Start:hello how are you

Client:fine thanks

Start:

Client

C:\Users\User>cd C:\j2sdk1.4.2_08\bin

C:\j2sdk1.4.2_08\bin>javac tcpc1.java

C:\j2sdk1.4.2_08\bin>java tcpc1

Server: welcome to india

Client: thank you

Server: hello how is you

Client: fine thanks

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Send Message from Server to Client using TCP in Java

SERVER

import java.net.*;

import java.io.*;

public class myserv{

public static void main(String s[]) throws IOException

{

ServerSocket s1=new ServerSocket(98);

Socket c=s1.accept();

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

PrintWriter out=new PrintWriter(c.getOutputStream(),true);

BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));

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

System.out.print("Send Message to Client :");

String l;

while((l=sin.readLine())!=null)

{

out.println(l);

System.out.print(" message :");

}

out.close();

sin.close();

c.close();

s1.close();

}}

CLIENT

import java.net.*;

import java.io.*;

public class myclient{

public static void main(String str[]) throws IOException

{

Socket s=new Socket(InetAddress.getLocalHost(),98);

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

String inp;

System.out.println("Ready to receiver");

while((inp=b.readLine())!=null)

{

System.out.println("Input from server : "+inp);

}

b.close();

s.close();

}}

OUTPUT

Server

Microsoft Windows XP [Version 5.1.2600]

(C) Copyright 1985-2001 Microsoft Corp.

C:\>cd C:\Program Files\Java\jdk1.6.0_11\bin

C:\Program Files\Java\jdk1.6.0_11\bin>javac myserv.java

C:\Program Files\Java\jdk1.6.0_11\bin>java myserv

ConnectionSocket[addr=/169.254.146.151,port=2873,localport=98]

Send Message to Client : god loves you

 message :have a nice day

 message :

Client

Microsoft Windows XP [Version 5.1.2600]

(C) Copyright 1985-2001 Microsoft Corp.

C:\>cd C:\Program Files\Java\jdk1.6.0_11\bin

C:\Program Files\Java\jdk1.6.0_11\bin>javac myclient.java

C:\Program Files\Java\jdk1.6.0_11\bin>java myclient

Ready to receive

Input from server :  god loves you

Input from server : have a nice day

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FInd the Factorial Number between Server and Client

SERVER

import java.net.*;

import java.io.*;

public class myserv{

public static void main(String ar[]){

try{

            DatagramSocket s =  new DatagramSocket(1234);

            while ( true ) {

            DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);

            s.receive( packet );

            String message = new String(packet.getData(), 0, 0, packet.getLength());

int res=1;

int ms=Integer.parseInt(message);

for(int i=1;i<=ms;i++) res=res*i;

String str1=res+" ";

  System.out.println( "Factorial of " + 

              message + " is " + str1);       }   }

catch(Exception e){}    }}

CLIENT

import java.net.*;

import java.io.*;

public class myclient{     

 public static void main(String ar[]) {

  int myPort = 1234;

try {

  DatagramSocket ds = new DatagramSocket();

  DatagramPacket pack;

  InetAddress addr = InetAddress.getLocalHost();

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

       {

         System.out.print("Enter the number to find factorial : ");

         String message=b.readLine();   

         byte [] data = new byte [ message.length() ];

         message.getBytes(0, data.length, data, 0);   

         pack =  new DatagramPacket(data, data.length, addr, myPort);

        ds.send( pack );

  }  }

        catch ( IOException e )  { 

        System.out.println( e );

    }  }}

OUTPUT

Client

C:\Program Files\Java\jdk1.6.0_11\bin>java client1

Enter the number  : 4

C:\Program Files\Java\jdk1.6.0_11\bin>java client1

Enter the number to find factorial : 6

Server:

C:\Program Files\Java\jdk1.6.0_11\bin>java serv

Factorial of 4 is 24

Factorial of 6 is 720

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