Clase utils de arquivos. Carrega e grava arquivos. Também converte arquivos em Base64

FileUtils.java

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Base64;

/**
 *
 * @author Guilherme Biff Zarelli (helpdev.com.br)
 */
public class FileUtils {

      private static final Base64.Encoder ENCODER = Base64.getEncoder();

    public static String encodeToString(byte[] bytes) {
        return ENCODER.encodeToString(bytes);
    }

    public static String encodeToString(File file)
            throws IOException {
        byte[] bytes = readAllBytes(file);
        return encodeToString(bytes);
    }

    public static void writeFile(byte[] data, File pathFile, String nameFile) throws IOException {
        File fileWrite = new File(pathFile, nameFile);
        if (!pathFile.exists() && !pathFile.mkdirs()) {
            throw new IOException("Failed create directory");
        }
        if (!fileWrite.exists() && !fileWrite.createNewFile()) {
            throw new IOException("Failed to create file");
        }
        Files.write(fileWrite.toPath(), data);
    }

    public static byte[] readAllBytes(File file) throws IOException {
        return Files.readAllBytes(file.toPath());
    }
}