How do I create File object from URL?

The code snippet below use the FileUtils.toFile(URL) method that can be found in the commons-io library to convert a URL into a File. The url protocol should be file or else null will be returned.

package org.kodejava.example.commons.io;

import org.apache.commons.io.FileUtils;

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

public class URLToFileObject {
    public static void main(String[] args) throws Exception {
        // FileUtils.toFile(URL url) convert from URL the File.
        String data = FileUtils.readFileToString(FileUtils.toFile(
                URLToFileObject.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);
    }
}

Maven Dependencies

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

How do I move directory to another directory with its entire contents?

Below is an example to move one directory with all its child directory and files to another directory. We can use the FileUtils.moveDirectory() method call to simplify the process.

package org.kodejava.example.commons.io;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;

public class DirectoryMove {
    public static void main(String[] args) {
        String source = "C:/Demo/source";
        File srcDir = new File(source);

        String destination = "C:/Demo/target";
        File destDir = new File(destination);

        try {
            //
            // Move the source directory to the destination directory.
            // The destination directory must not exists prior to the
            // move process.
            //
            FileUtils.moveDirectory(srcDir, destDir);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}