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With inspiration from other libraries
There is a newer version: 2.12.15
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.util;

import ch.qos.logback.core.Context;
import ch.qos.logback.core.rolling.RolloverFailure;
import ch.qos.logback.core.spi.ContextAwareBase;

import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class FileUtil extends ContextAwareBase {

    public FileUtil(Context context) {
        setContext(context);
    }

    public static URL fileToURL(File file) {
        try {
            return file.toURI().toURL();
        } catch (MalformedURLException e) {
            throw new RuntimeException("Unexpected exception on file [" + file + "]", e);
        }
    }

    /**
     * Creates the parent directories of a file. If parent directories not
     * specified in file's path, then nothing is done and this returns
     * gracefully.
     *
     * @param file file whose parent directories (if any) should be created
     * @return {@code true} if either no parents were specified, or if all
     * parent directories were created successfully; {@code false} otherwise
     */
    static public boolean createMissingParentDirectories(File file) {
        File parent = file.getParentFile();
        if (parent == null) {
            // Parent directory not specified, therefore it's a request to
            // create nothing. Done! ;)
            return true;
        }

        // File.mkdirs() creates the parent directories only if they don't
        // already exist; and it's okay if they do.
        parent.mkdirs();
        return parent.exists();
    }

    public String resourceAsString(ClassLoader classLoader, String resourceName) {
        URL url = classLoader.getResource(resourceName);
        if (url == null) {
            addError("Failed to find resource [" + resourceName + "]");
            return null;
        }

        InputStreamReader isr = null;
        try {
            URLConnection urlConnection = url.openConnection();
            urlConnection.setUseCaches(false);
            isr = new InputStreamReader(urlConnection.getInputStream());
            char[] buf = new char[128];
            StringBuilder builder = new StringBuilder();
            int count = -1;
            while ((count = isr.read(buf, 0, buf.length)) != -1) {
                builder.append(buf, 0, count);
            }
            return builder.toString();
        } catch (IOException e) {
            addError("Failed to open " + resourceName, e);
        } finally {
            if (isr != null) {
                try {
                    isr.close();
                } catch (IOException e) {
                    // ignore
                }
            }
        }
        return null;
    }

    static final int BUF_SIZE = 32 * 1024;

    public void copy(String src, String destination) throws RolloverFailure {
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            bis = new BufferedInputStream(new FileInputStream(src));
            bos = new BufferedOutputStream(new FileOutputStream(destination));
            byte[] inbuf = new byte[BUF_SIZE];
            int n;

            while ((n = bis.read(inbuf)) != -1) {
                bos.write(inbuf, 0, n);
            }

            bis.close();
            bis = null;
            bos.close();
            bos = null;
        } catch (IOException ioe) {
            String msg = "Failed to copy [" + src + "] to [" + destination + "]";
            addError(msg, ioe);
            throw new RolloverFailure(msg);
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    // ignore
                }
            }
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e) {
                    // ignore
                }
            }
        }
    }
}