Java – Change File Date / Time using Commons FileUtils

import java.io.IOException;
import org.apache.commons.io.FileUtils;

import java.io.File;

public class Main {

	public static void main(String[] args) {
		try {
			File file = new File("pic.jpg");
			long lastModified1 = file.lastModified();
			FileUtils.touch(file);
			long lastModified2 = file.lastModified();
			System.out.println("File date / time was updated: " + (lastModified2 > lastModified1));
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

}

Output:

File date / time was updated: true

Java – Calculate Directory Size using Commons FileUtils

import java.io.File;
import org.apache.commons.io.FileUtils;

public class DirectorySizeSample {

	public static void main(String[] args) {

		// Using FileUtils.sizeOfDirectory() we can calculate
		// the size of a directory including it sub directory
		long size = FileUtils.sizeOfDirectory(new File("C:/Windows"));

		System.out.println("Size: " + size + " bytes");

	}
}

Java – Create File Object from URL using Commons FileUtils

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.net.URL;

public class URLToFile {

	public static void main(String[] args) throws Exception {
		//
		// FileUtils.toFile(URL url) convert from URL the File.
		//
		String data = FileUtils.readFileToString(FileUtils.toFile(
				URLToFile.class.getResource("/data.txt")));
		System.out.println("data = " + data);

		//
		// Creates a URL with file protocol and convert it into File
		// object.
		//
		File file = FileUtils.toFile(new URL("file://D:/demo.txt"));
		data = FileUtils.readFileToString(file);
		System.out.println("data = " + data);
	}

}

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