File Transfer via LAN using JAVA

Step 1-  Create java source file named "fileSender.java"


import java.net.*;
import java.io.*;

class fileSender
{
    public static void main(String arg[])throws IOException
      {
         DataInputStream dis=new DataInputStream(System.in);  // For Keyboard Input
         DatagramSocket dgsocket=new DatagramSocket();
         DatagramPacket datapack;
         InetAddress destination;
        System.out.print("Enter Machine IP Address / Name :  ");  //  IP Address of Host (Receiver)
        String ipadd=dis.readLine();
        destination=InetAddress.getByName(ipadd);
        System.out.print("Enter file name or path to be send :  ");
        String filepath=dis.readLine();

        String filename=filepath.substring(filepath.lastIndexOf('\\')+1,filepath.length());
        byte[]dt=filename.getBytes();
        datapack=new DatagramPacket(dt,dt.length,destination,1212);
        dgsocket.send(datapack);   // Send File Name

        File file=new File(filepath);
        FileInputStream fis=new FileInputStream(file);
        int filesize=fis.available();
        byte[] data=new byte[filesize];
        fis.read(data);

        datapack=new DatagramPacket(data,data.length,destination,1212);
        dgsocket.send(datapack);  // Send Contents of file

       System.out.println("\nFile Transfer Successful !");
         
       dgsocket.close();
      }
}

Step 2-  Create java source file named "fileReceiver.java"

import java.net.*;

import java.io.*;

class fileReceiver

{

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

  {

    byte data[]=new byte[131072];

    DataInputStream dis=new DataInputStream(System.in);

    DatagramSocket dgsocket=new DatagramSocket(1212);

    DatagramPacket rcvpack;

    System.out.print("\nEnter Directory path and name where you want to save :");

    String dirpath=dis.readLine();

    System.out.println("\n\n\tWaiting for receiving file.........");

    rcvpack=new DatagramPacket(data,data.length);

   /************************* Getting file name*********************/

    dgsocket.receive(rcvpack);

    String filedata=new String(rcvpack.getData());

    filedata=filedata.substring(0,rcvpack.getLength());

    dirpath=dirpath+"\\"+filedata;

  /*************************Getting file data *********************/

    dgsocket.receive(rcvpack);

    filedata=new String(rcvpack.getData());

    filedata=filedata.substring(0,rcvpack.getLength());

 /************************* Saving Content of file *****************/

    FileOutputStream fout=new FileOutputStream(dirpath);

    fout.write(filedata.getBytes());

    System.out.println("\nFile received and Saved !");

 }

}

 Step 3: Compile & Run

Machine 1

Machine 2

Now !   Enjoy........