How to Copy Directory in Java

In this example we will show how to copy the contents of a directory to another directory in Java.

Source Code

package com.beginner.examples;

import java.io.*;  

public class CopyDirectory {  
    
    static String url1 = "f:/photos";  
    
    static String url2 = "d:/tempPhotos";  
    
    public static void main(String args[]) throws IOException {  
         
        (new File(url2)).mkdirs(); 
        
        File[] file = (new File(url1)).listFiles();  
        for (int i = 0; i < file.length; i++) {  
            if (file[i].isFile()) {  
                   
                copyFile(file[i],new File(url2+file[i].getName()));  
            }  
            if (file[i].isDirectory()) {  
                   
                String sourceDir=url1+File.separator+file[i].getName();  
                String targetDir=url2+File.separator+file[i].getName();  
                copyDirectiory(sourceDir, targetDir);  
            }  
        }  
    }  
  
    public static void copyFile(File sourceFile,File targetFile) throws IOException{  
           
        FileInputStream input = new FileInputStream(sourceFile);  
        BufferedInputStream inBuff=new BufferedInputStream(input);  
  
          
        FileOutputStream output = new FileOutputStream(targetFile);  
        BufferedOutputStream outBuff=new BufferedOutputStream(output);  
          
        
        byte[] b = new byte[1024 * 5];  
        int len;  
        while ((len =inBuff.read(b)) != -1) {  
            outBuff.write(b, 0, len);  
        }  
           
        outBuff.flush();  
          
        
        inBuff.close();  
        outBuff.close();  
        output.close();  
        input.close();  
    }  
      
    public static void copyDirectiory(String sourceDir, String targetDir) throws IOException {  
    	(new File(targetDir)).mkdirs();
        
        File[] file = (new File(sourceDir)).listFiles();  
        for (int i = 0; i < file.length; i++) {  
            if (file[i].isFile()) {  
                
                File sourceFile=file[i];  
                  
               File targetFile=new File(new File(targetDir).getAbsolutePath()+File.separator+file[i].getName());  
                copyFile(sourceFile,targetFile);  
            }  
            if (file[i].isDirectory()) {
                   
                String dir1=sourceDir + "/" + file[i].getName();  
                
                String dir2=targetDir + "/"+ file[i].getName();  
                copyDirectiory(dir1, dir2);  
            }  
        }  
    }  
}