Blog

Java Tutorial : How To Create Peer To Peer Network With Java Programming On NetBeans

By @lapulga•9/4/2018•utopian-io

Repository

https://github.com/dmlloyd/openjdk

What Will I Learn?

  • You will learn how to conencting two computer.
  • You will learn how to create peer to peer connection.
  • You will learn how to implement java networking.

Requirements

  • you must understand basic of java programming
  • you must know about socket programming
  • you must know defination about peer to peer networking.

Difficulty

  • Basic

Tutorial Contents

okay, on this occasion I will share a tutorial how to make a connection between two computers using a peer to peer network, the first step we do is to create a program for the server computer, after that we will create a program for the client computer. we will determine the server and port number to match.
Okay, we just started the tutorial.

  • the first step you have to do is provide two computers to connect to, if you don't have two computers, you can use VMware instead.
  • then open the NetBeans application on one computer and create a new java file.
  • then type the program below for the first computer or server computer.
package clientserver;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.JOptionPane;

public class Server {
    public static void main(String[] args) throws IOException{
        int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));
String IP = JOptionPane.showInputDialog("Input Your IP Server : ");
       ServerSocket serverSock=new ServerSocket(6066);
       Socket Sock=serverSock .accept();
       DataOutputStream out =new DataOutputStream(Sock.getOutputStream());
       out.writeUTF("i am fine, thank you");
       DataInputStream in= new DataInputStream(Sock.getInputStream());
        System.out.println(in.readUTF());
       Sock.close();   
    }
}
  • okay, i will explain a little about the program above
  • import java.io.DataInputStream; This program is a program that functions for input types with Stream types
  • import java.io.DataOutputStream; this is also Stream type, but this is for the output section.
  • import java.io.IOException;this is a class that functions to handle the two previous classes, namely input and output.
  • import java.net.ServerSocket; this is a class that works to run a server.
  • import java.net.Socket; this is a class that must exist on each socket programming.
  • import javax.swing.JOptionPane;this is the class we use if we implement the JOptionpane input method.
  • public class Server { this is a class name declaration
  • public static void main(String[] args) throws IOException{this is the main function that must be present in every java programming.
  • int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));this is a declaration of port variables with integer data types.
  • String IP = JOptionPane.showInputDialog("Input Your IP Server : "); this is a declaration of IP variables with varchar data types.
  • ServerSocket serverSock=new ServerSocket(6066);this is the determination of the port number that is = 6066
  • Socket Sock=serverSock .accept();this is the creation of an accept action if the client computer with the same port number.
  • out.writeUTF("connecting succes"); this is a notification if both computers are successfully connected.
  • Okay, for the first program it's finished, then we will create a program for the second computer.
  • create a new file for the second computer or client computer.
  • then type the program below for client komputer
package clientserver;

import java.io.DataInputStream;
import java.io.DataOutputStream;

import java.io.IOException;
import java.net.Socket;
import javax.swing.JOptionPane;

public class Client {

public static void main(String[] args)throws IOException {
    int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));
String IP = JOptionPane.showInputDialog("Input Your IP Server : ");
Socket sock=new Socket("localhost", 6066);
DataInputStream in= new DataInputStream(sock.getInputStream());
System.out.println(in.readUTF());
DataOutputStream out =new DataOutputStream(sock.getOutputStream());
out.writeUTF("waiting for connection");
sock.close();
}}
  • actually the program is almost the same between the two computers, just different in a few parts.
  • I don't need to explain about the second program because the syntax is the same as the first program.
  • Okay, then we will run the program.
input port number
***
input your IP
***
Before run server program
***
after running server program
*** OK, the program is finished, the two computers can be connected to each other through the *peer to peer* network #### Curriculum

Proof of Work Done

https://gist.github.com/andilapulga/4cd8c88b2e686720e5a4c24ef094394d

31

comments