Calculate Free Disk Space in Java using Apache Commons IO

java logoAs a Java developer, lot of times I have to play around with file system. Sometimes I have to copy files/directories from one location to another; sometimes have to process certain files depending on certain pattern. In one of my test program, I wanted to calculate available disk space using Java. Lot of code snippets are available for this task. I liked the one using Apache Commons IO library. Here is a simple trick for Java developers to calculate free diskspace. We have used Apache Commons IO library to calculate this. Apache Commons IO library contains a class org.apache.commons.io.FileSystemUtils which can be used to calculate the free disk space in any system. Let us see the Java code for this.
package net.viralpatel.java;

import java.io.IOException;

import org.apache.commons.io.FileSystemUtils;

public class DiskSpace {
	public static void main(String[] args) {
		try {
			
			//calculate free disk space 
			double freeDiskSpace = FileSystemUtils.freeSpaceKb("C:"); 

			//convert the number into gigabyte
			double freeDiskSpaceGB = freeDiskSpace / 1024 / 1024;

			System.out.println("Free Disk Space (GB):" + freeDiskSpaceGB);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}
Output:
Free Disk Space (GB): 40.145268
In above code we used FileSystemUtils.freeSpaceKb( ) method to get the free space in kilo byte. This method invokes the command line to calculate the free disk space. You may want to call this method in following way to get free disk space in Windows and Linux.
FileSystemUtils.freeSpaceKb("C:");       // Windows
 FileSystemUtils.freeSpaceKb("/volume");  // *nix
 
The free space is calculated via the command line. It uses ‘dir /-c’ on Windows, ‘df -kP’ on AIX/HP-UX and ‘df -k’ on other Unix. In order to work, you must be running Windows, or have a implementation of Unix df that supports GNU format when passed -k (or -kP). If you are going to rely on this code, please check that it works on your OS by running some simple tests to compare the command line with the output from this class.
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4 Comments

  1. afsina says:

    That functionality is already available in Java 6.

  2. Marcin says:

    In Java 1.6 there is getFreeSpace method in File class.

  3. Halit says:

    Very good content

  4. Nikhil says:

    Hi,

    The code works good for windows platform, on linux it doesn’t return expected result….(:

    .Nikhil

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