Javaでディレクトリをコピーする方法

package com.mkyong.file;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CopyDirectoryExample
{
    public static void main(String[]args)
    {
        File srcFolder = new File("c:\\mkyong");
        File destFolder = new File("c:\\mkyong-new");

       //make sure source exists
        if(!srcFolder.exists()){

           System.out.println("Directory does not exist.");
          //just exit
           System.exit(0);

        }else{

           try{
            copyFolder(srcFolder,destFolder);
           }catch(IOException e){
            e.printStackTrace();
           //error, just exit
                System.exit(0);
           }
        }

        System.out.println("Done");
    }

    public static void copyFolder(File src, File dest)
        throws IOException{

        if(src.isDirectory()){

           //if directory not exists, create it
            if(!dest.exists()){
               dest.mkdir();
               System.out.println("Directory copied from "
                              + src + "  to " + dest);
            }

           //list all the directory contents
            String files[]= src.list();

            for (String file : files) {
              //construct the src and dest file structure
               File srcFile = new File(src, file);
               File destFile = new File(dest, file);
              //recursive copy
               copyFolder(srcFile,destFile);
            }

        }else{
           //if file, then copy it
           //Use bytes stream to support all file types
            InputStream in = new FileInputStream(src);
                OutputStream out = new FileOutputStream(dest);

                byte[]buffer = new byte[1024];

                int length;
               //copy the file content in bytes
                while ((length = in.read(buffer)) > 0){
                   out.write(buffer, 0, length);
                }

                in.close();
                out.close();
                System.out.println("File copied from " + src + " to " + dest);
        }
    }
}

Directory copied from c:\mkyong  to c:\mkyong-new
File copied from c:\mkyong\404.php to c:\mkyong-new\404.php
File copied from c:\mkyong\footer.php to c:\mkyong-new\footer.php
File copied from c:\mkyong\js\superfish.css to c:\mkyong-new\js\superfish.css
File copied from c:\mkyong\js\superfish.js to c:\mkyong-new\js\superfish.js
File copied from c:\mkyong\js\supersubs.js to c:\mkyong-new\js\supersubs.js
Directory copied from c:\mkyong\images  to c:\mkyong-new\images
File copied from c:\mkyong\page.php to c:\mkyong-new\page.php
Directory copied from c:\mkyong\psd  to c:\mkyong-new\psd
...

完了