what is socket programming?One way and 2_way client server communication source code in java using netbeans

Socket Programming:
A   socket   is   a  one  end  point  of   two way  communication    link    between   two   programs running on  a network.A   socket    is   bound   to  a  port   number , so that  the    TCP (Transmission Control Protocol) layer     can   identify   the   application  that    data   is   destined   to   be   sent  to. An   endpoint   is   a   combination   of   an   IP   address  and  a   port  number.




                               One way client server Communication

For   Client:

package clientt;
import java.io.IOException;
import java.net.*;
import java.io.DataOutputStream;

public class Clientt {

    /**
     * @param args the command line arguments

     * @throws java.io.IOException

     */

    public static void main(String[] args) throws IOException {
 
  // TODO code application logic here

       try
           {
             
                      Socket   s=new Socket("localhost",6666);
   
        DataOutputStream    dos=new DataOutputStream(s.getOutputStream());

      dos.writeUTF("helloWorld");

        dos.flush();


        dos.close();

    }

catch (IOException e)
{
 
   System.out.println(e);

    }
    }
    }



     For Server:

package serverr;

import java.io.IOException;

import java.net.*;

import java.io.DataInputStream;

public class Serverr {


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

        // TODO code application logic here

  try{
     ServerSocket ss =new ServerSocket(6666);

       Socket s=ss.accept();

       DataInputStream din=new   DataInputStream(s.getInputStream());

       String str=(String)din.readUTF();

       System.out.println(str+"message");

       ss.close();

  }

catch(Exception e){

System.out.println(e);

    }}}                          



                     2 way Client Server Communication


SERVER CODE


"package server;
import java.net.*;
import java.io.*;


public class Server {

public static void main(String args[])throws Exception{

    ServerSocket ss=new ServerSocket(3333);

    Socket s=ss.accept();

    DataInputStream din=new DataInputStream(s.getInputStream());

    DataOutputStream dout=new DataOutputStream(s.getOutputStream());

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



    String str="",str2="";

    while(!str.equals("stop"))

    {

       str=din.readUTF();

       System.out.println("client says: "+str);

       str2=br.readLine();

       dout.writeUTF(str2);

       dout.flush();
    }
    din.close();

    s.close();

    ss.close();

  }
}




CLIENT CODE

package client;

import java.net.*;

import java.io.*;

public class Client {

public static void main(String args[]) throws Exception{

   Socket s=new Socket("localhost",3333);

   DataInputStream din=new DataInputStream(s.getInputStream());

   DataOutputStream dout=new DataOutputStream(s.getOutputStream());

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

   String str="",str2="";

    while(!str.equals("stop")){

       str=br.readLine();

       dout.writeUTF(str);

       dout.flush();

       str2=din.readUTF();

       System.out.println("Server says: "+str2);
    }

dout.close();
s.close();
}
}



Related Links:

                              

    source code of threading and synchronization in java:

https://assignmentsppt.blogspot.com/2017/08/code-for-threading-and-set-minimum-or.html