package niopkg;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.RandomAccessFile;

import java.nio.channels.FileChannel;

import java.nio.channels.WritableByteChannel;

import java.util.Scanner;

// Transfer data from 1 file to other file using Java-NIO

public class TransferData {

public static void main(String[] args) {

try (Scanner scanner = new Scanner(System.in)) {

System.out.println("Select The opetion That Listed below : ");

System.out.println("1 : TransferTo");

System.out.println("2 : TransferFrom");

switch (scanner.next()) {

case "1":

// Destination File

FileOutputStream outputStream = new FileOutputStream(new File("G:/1.txt"));

WritableByteChannel destinationChannel = outputStream.getChannel();

// Write Data in Source File

FileOutputStream sourceFileStream = new FileOutputStream("G:/12.txt");

sourceFileStream.write("Data Write in Source File".getBytes());

sourceFileStream.close();

// Source File open with read mode

FileInputStream inputStream = new FileInputStream(new File("G:/12.txt"));

FileChannel sourceChannel = inputStream.getChannel();

sourceChannel.transferTo(0, sourceChannel.size(), destinationChannel);

sourceChannel.close();

inputStream.close();

System.out.println("Successfully Transfer The Data from '1.txt' to '12.txt'");

break;

case "2":

FileOutputStream outputStream2 = new FileOutputStream(new File("G:/22.txt"));

outputStream2.write("Write Data in source file".getBytes());

outputStream2.close();

// by Using Random Access File with JAVA-NIO

RandomAccessFile sourceFile = new RandomAccessFile("G:/22.txt", "r");

FileChannel sourceChannelFrom = sourceFile.getChannel();

RandomAccessFile destFile = new RandomAccessFile("G:/33.txt", "rw");

FileChannel destinationChannelFrom = destFile.getChannel();

destinationChannelFrom.transferFrom(sourceChannelFrom, 0, sourceChannelFrom.size());

System.out.println("Successfully Transfer The Data from '22.txt' to '33.txt'");

break;

}

} catch (Exception e) {

e.printStackTrace();

}

}

}