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AppsLandia Common - Java Utilities
There is a newer version: 19.25.0
// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.common.utils;

import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Arrays;

/**
 *
 * @author Loc Ha
 *
 */
public class FileUtils {

  public static Path mkdirs(String dir) {
    Path path = Paths.get(dir);
    path.toFile().mkdirs();
    return path;
  }

  public static void writeContent(Path path, String content) throws IOException {
    writeContent(path, content, StandardCharsets.UTF_8);
  }

  public static void writeContent(Path path, String content, Charset charset) throws IOException {
    Files.write(path, Arrays.asList(content), charset);
  }

  public static String readContent(Path src) throws IOException {
    return readContent(src, StandardCharsets.UTF_8);
  }

  public static String readContent(Path path, Charset charset) throws IOException {
    return new String(Files.readAllBytes(path), charset);
  }

  public static void deleteRecursively(Path root) throws IOException {
    Files.walkFileTree(root, new SimpleFileVisitor() {
      @Override
      public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
        Files.delete(file);
        return FileVisitResult.CONTINUE;
      }

      @Override
      public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
        try {
          Files.delete(dir);
        } catch (DirectoryNotEmptyException ex) {
        }
        return FileVisitResult.CONTINUE;
      }
    });
  }

  public static void copyRecursively(Path src, Path dest) throws IOException {
    BasicFileAttributes srcAttr = Files.readAttributes(src, BasicFileAttributes.class);

    if (srcAttr.isDirectory()) {
      Files.walkFileTree(src, new SimpleFileVisitor() {
        @Override
        public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
          Files.createDirectories(dest.resolve(src.relativize(dir)));
          return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
          Files.copy(file, dest.resolve(src.relativize(file)));
          return FileVisitResult.CONTINUE;
        }
      });
    } else if (srcAttr.isRegularFile()) {
      Files.copy(src, dest);
    } else {
      throw new IllegalArgumentException("src must denote a directory or file.");
    }
  }
}