Get and Display File Size in a Readable Version using Commons IO

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This example shows how to get the size of a file and display it in a readable way.
The Apache Commons library has a class called FileUtils which has a static method called byteCountToDisplaySize().
It takes a long datatype as argument and returns a string. We get the actual size in bytes by using the java.io.File class and calling its method length() which returns the number of bytes.
However, that is not very readable and to use in a user interface we'd have to convert it somehow, had we not been able to use the FileUtils class.
In the example we print both the raw byte count and the readable version to console:

package com.javadb.examples;

import org.apache.commons.io.FileUtils;

import java.io.File;

/**
*
* @author www.javadb.com
*/
public class Main {

    public static void main(String[] args) {

        File file = new File("pic.jpg");
        long size = file.length();
        String sizeDesc = FileUtils.byteCountToDisplaySize(size);

        System.out.println(size);
        System.out.println(sizeDesc);
    }
}

This is what the output looked like when the above code was run:

53771
52 KB

See also: Get File Size in Core Java

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