Showing posts with label directory. Show all posts
Showing posts with label directory. Show all posts

Friday 23 August 2013

Java program to the current working directory

In , , // siddhu vydyabhushana // 6 comments
Here’s an example to check if a directory is empty.

Example

package com.mkyong.file;
 
import java.io.File;
 
public class CheckEmptyDirectoryExample
{
    public static void main(String[] args)
    {	
 
	File file = new File("C:\\folder");
 
	if(file.isDirectory()){
 
		if(file.list().length>0){
 
			System.out.println("Directory is not empty!");
 
		}else{
 
			System.out.println("Directory is empty!");
 
		}
 
	}else{
 
		System.out.println("This is not a directory");
 
	}
    }
}
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Java program to check the directory is empty or not

In , , // siddhu vydyabhushana // 6 comments
Here’s an example to check if a directory is empty.

Example

package com.mkyong.file;
 
import java.io.File;
 
public class CheckEmptyDirectoryExample
{
    public static void main(String[] args)
    {	
 
	File file = new File("C:\\folder");
 
	if(file.isDirectory()){
 
		if(file.list().length>0){
 
			System.out.println("Directory is not empty!");
 
		}else{
 
			System.out.println("Directory is empty!");
 
		}
 
	}else{
 
		System.out.println("This is not a directory");
 
	}
    }
}
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How to copy directory in java

In , , // siddhu vydyabhushana // 5 comments
Here’s an example to copy a directory and all its sub-directories and files to a new destination directory. The code is full of comments and self-explanatory, left me comment if you need more explanation.

Example

Copy folder “c:\\mkyong” and its sub-directories and files to another new folder “c:\\mkyong-new“.
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);
    	}
    }
}

Result
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
...
Done
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How to delete directory in java

In , , // siddhu vydyabhushana // 4 comments
To delete a directory, you can simply use the File.delete(), but the directory must be empty in order to delete it.
Often times, you may require to perform recursive delete in a directory, which means all it’s sub-directories and files should be delete as well, see below example :

Directory recursive delete example

Delete the directory named “C:\\mkyong-new“, and all it’s sub-directories and files as well. The code is self-explanatory and well documented, it should be easy to understand.
package com.mkyong.file;
 
import java.io.File;
import java.io.IOException;
 
public class DeleteDirectoryExample
{
    private static final String SRC_FOLDER = "C:\\mkyong-new";
 
    public static void main(String[] args)
    {	
 
    	File directory = new File(SRC_FOLDER);
 
    	//make sure directory exists
    	if(!directory.exists()){
 
           System.out.println("Directory does not exist.");
           System.exit(0);
 
        }else{
 
           try{
 
               delete(directory);
 
           }catch(IOException e){
               e.printStackTrace();
               System.exit(0);
           }
        }
 
    	System.out.println("Done");
    }
 
    public static void delete(File file)
    	throws IOException{
 
    	if(file.isDirectory()){
 
    		//directory is empty, then delete it
    		if(file.list().length==0){
 
    		   file.delete();
    		   System.out.println("Directory is deleted : " 
                                                 + file.getAbsolutePath());
 
    		}else{
 
    		   //list all the directory contents
        	   String files[] = file.list();
 
        	   for (String temp : files) {
        	      //construct the file structure
        	      File fileDelete = new File(file, temp);
 
        	      //recursive delete
        	     delete(fileDelete);
        	   }
 
        	   //check the directory again, if empty then delete it
        	   if(file.list().length==0){
           	     file.delete();
        	     System.out.println("Directory is deleted : " 
                                                  + file.getAbsolutePath());
        	   }
    		}
 
    	}else{
    		//if file, then delete it
    		file.delete();
    		System.out.println("File is deleted : " + file.getAbsolutePath());
    	}
    }
}

Result

File is deleted : C:\mkyong-new\404.php
File is deleted : C:\mkyong-new\archive.php
...
Directory is deleted : C:\mkyong-new\includes
File is deleted : C:\mkyong-new\index.php
File is deleted : C:\mkyong-new\index.php.hacked
File is deleted : C:\mkyong-new\js\hoverIntent.js
File is deleted : C:\mkyong-new\js\jquery-1.4.2.min.js
File is deleted : C:\mkyong-new\js\jquery.bgiframe.min.js
Directory is deleted : C:\mkyong-new\js\superfish-1.4.8\css
Directory is deleted : C:\mkyong-new\js\superfish-1.4.8\images
Directory is deleted : C:\mkyong-new\js\superfish-1.4.8
File is deleted : C:\mkyong-new\js\superfish-navbar.css
...
Directory is deleted : C:\mkyong-new
Done
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How to create directory in java

In , , // siddhu vydyabhushana // 3 comments
To create a directory in Java, uses the following code :
1. Create a single directory.
new File("C:\\Directory1").mkdir();
2. Create a directory named “Directory2 and all its sub-directories “Sub2″ and “Sub-Sub2″ together.
new File("C:\\Directory2\\Sub2\\Sub-Sub2").mkdirs()
Both methods are returning a boolean value to indicate the operation status : true if succeed, false otherwise.

Example

A classic Java directory example, check if directory exists, if no, then create it.
package com.mkyong.file;
 
import java.io.File;
 
public class CreateDirectoryExample
{
    public static void main(String[] args)
    {	
	File file = new File("C:\\Directory1");
	if (!file.exists()) {
		if (file.mkdir()) {
			System.out.println("Directory is created!");
		} else {
			System.out.println("Failed to create directory!");
		}
	}
 
	File files = new File("C:\\Directory2\\Sub2\\Sub-Sub2");
	if (files.exists()) {
		if (files.mkdirs()) {
			System.out.println("Multiple directories are created!");
		} else {
			System.out.println("Failed to create multiple directories!");
		}
	}
 
    }
}
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