Java Tutorial: How To Create a Program To Send And Receive Files On...

What Will I Learn?

You will learn how to create java program to send big file on NetBeans
You will learn the workings of the application in sending and receiving a data
You will learn how to connect two programs in one java package

Requirements

you must understand the basics of java programming
you should be able to operate classes in java according to its function
NetBeans

Difficulty

Intermediate

Tutorial Contents

okay i will give tutorial how to make program to send and receive big file with java using NetBeans. here we will create both programs in one package. i will create two program to send and recivied file here.

first open NetBeans.
then create a new project.

then write the name of the project.

then select create new class.
then type the program script below.

package file;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.JOptionPane;
public class Send {
    public static void main(String[] args)throws IOException {
      String namalokasifile= JOptionPane.showInputDialog("masukkan lokasi file"+"(e.g E:\\nama.format):");
      int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));
      ServerSocket sock=new ServerSocket (Port);
      JOptionPane.showMessageDialog(null,"server started");
       JOptionPane.showMessageDialog(null,"waiting client");
        Socket soc =sock.accept();
          BufferedOutputStream bos = new BufferedOutputStream (soc.getOutputStream());
          FileInputStream fis=new FileInputStream(namalokasifile);
          BufferedInputStream bis = new BufferedInputStream(fis);
          int n=-1;
          byte[] buffer;
        buffer = new byte [70022386];
          while((n= bis.read(buffer))>-1)
          {
              bos.write(buffer,0,n);
              System.out.println("bytes="+n);
                      bos.flush();}}}

okay, I'll explain a bit about the script above.
this is the package name of these two programs we will create in one package package Send;
this is the declaration of the classes we use in the program.

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.JOptionPane;

this is the declaration of the class name send public class Send writing class names must be capitalized, and should not use spaces.
this Throws IOException Is A Method That Reads String Data Input
this is a variable declaration process port int Port =Integer.parseInt(JOptionPane.showInputDialog with JOptionPane input method.
classjava.net.ServerSocket used by Server to connections.
for data delivery process sock.accept() also called socket programing.
Class BufferedInputStream andBufferedOutputStream can be used for reading and writing binary data from a file.
ini byte[] buffer; function To read a number of data bytes.
ini System.out.println serves to print the writing to the screen.
okay then we will create a second file that serves as the recipient of the file that is sent, we call it with Recivied.
type the program under the same package as the previous program.

package file;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.Socket;
import javax.swing.JOptionPane;
public class ReciveBig {
    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 : ");
            String save= JOptionPane.showInputDialog("masukkan tempat lokasi penyimpanan (e.g E:\\nama_file.Format_file) : ");    
            Socket sock=new Socket(IP,Port);
            File file=new File(save);
            BufferedInputStream bis=new BufferedInputStream(sock.getInputStream());
            FileOutputStream fos = new FileOutputStream(file);
            int n;
            byte[] buffer = new byte[70022386];
            JOptionPane.showMessageDialog(null,"Connected");
            while ((n = bis.read(buffer)) > -1) {
                System.out.println("bytes="+n);
                fos.write(buffer, 0, n);
//                if(n<(1024)){
//                    fos.close();
//                    bis.close();
//                    break;
                } 
                fos.flush();
            }
            JOptionPane.showMessageDialog(null,"File Received");        
    }}

the second program is same as the first program, only different in some part, so I do not need to explain it again.
we just run both programs.
right click on the program Send.java then select run file.

then enter the location and name of the file you want to send.
then run the second file the file Receive.java as before. - in this section write down localhost