package com.howtodoinjava.examples.io;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;

public class DirectoryCopyExample 
{
	public static void main(String[] args) throws IOException 
	{
		//Source directory which you want to copy to new location
		File sourceFolder = new File("c:\\temp");

		//Target directory where files should be copied
		File destinationFolder = new File("c:\\tempNew");

		//Call Copy function
		copyFolder(sourceFolder, destinationFolder);
	}
	/**
	 * This function recursively copy all the sub folder and files from sourceFolder to destinationFolder
	 * */
	private static void copyFolder(File sourceFolder, File destinationFolder) throws IOException
	{
		//Check if sourceFolder is a directory or file
		//If sourceFolder is file; then copy the file directly to new location
		if (sourceFolder.isDirectory()) 
		{
			//Verify if destinationFolder is already present; If not then create it
			if (!destinationFolder.exists()) 
			{
				destinationFolder.mkdir();
				System.out.println("Directory created :: " + destinationFolder);
			}

			//Get all files from source directory
			String files[] = sourceFolder.list();

			//Iterate over all files and copy them to destinationFolder one by one
			for (String file : files) 
			{
				File srcFile = new File(sourceFolder, file);
				File destFile = new File(destinationFolder, file);

				//Recursive function call
				copyFolder(srcFile, destFile);
			}
		}
		else 
		{
			//Copy the file content from one place to another 
			Files.copy(sourceFolder.toPath(), destinationFolder.toPath(), StandardCopyOption.REPLACE_EXISTING);
			System.out.println("File copied :: " + destinationFolder);
		}
	}
}

Output:

Directory created :: c:\tempNew
File copied :: c:\tempNew\testcopied.txt
File copied :: c:\tempNew\testoriginal.txt
File copied :: c:\tempNew\testOut.txt