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AJAXJS aims to full-stack, not only the server-side framework, but also integrates the front-end library. It's written in HTML5 + Java, a successor to the JVM platform, efficient, secure, stable, cross-platform and many other advantages, but it abandoned the traditional enterprise architecture brought about by the large and bloated, emphasizing the lightweight, and fast, very suitable for the Internet fast application.

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package com.ajaxjs.util.io;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryStream;
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.LinkedList;
import java.util.List;
import java.util.function.Predicate;

public class IoFileImpl {
	/**
	 * 打开文件，返回其文本内容
	 * 
	 * @param fullpath 文件磁盘路径
	 * @return 文件内容
	 * @throws IOException IO 异常
	 */
	public static String read(String fullpath) throws IOException {
		return read(fullpath, StandardCharsets.UTF_8);
	}

	/**
	 * 打开文件，返回其文本内容，可指定编码
	 * 
	 * @param fullpath 文件磁盘路径
	 * @param encode   文件编码
	 * @return 文件内容
	 * @throws IOException IO 异常
	 */
	public static String read(String fullpath, Charset encode) throws IOException {
		Path path = Paths.get(fullpath);

		if (Files.isDirectory(path))
			throw new IOException("参数 fullpath：" + fullpath + " 不能是目录，请指定文件");

		if (!Files.exists(path))
			throw new IOException(fullpath + "　不存在");

		return new String(Files.readAllBytes(path), encode);
	}

	/**
	 * 
	 * @param fullpath
	 * @param content
	 * @return 是否操作成功
	 * @throws IOException
	 */
	public static boolean save(String fullpath, String content) throws IOException {
		Path path = Paths.get(fullpath);

		if (Files.isDirectory(path))
			throw new IOException("参数 fullpath：" + fullpath + " 不能是目录，请指定文件");

		if (!Files.exists(path))
			Files.createFile(path);

		Files.write(path, content.getBytes());

		return true;
	}

	/**
	 * 删除文件或目录
	 * 
	 * @param fullpath 源文件
	 * @return 是否操作成功
	 * @throws IOException IO 异常
	 */
	public static boolean delete(String fullpath) throws IOException {
		Files.delete(Paths.get(fullpath));
		return true;
	}

	/**
	 * 复制文件
	 * 
	 * @param target 源文件
	 * @param dest   目的文件/目录，如果最后一个为目录，则不改名，如果最后一个为文件名，则改名
	 * @return 是否操作成功
	 * @throws IOException IO 异常
	 */
	public static boolean copy(String target, String dest) throws IOException {
		Files.copy(Paths.get(target), Paths.get(dest));
		return true;
	}

	/**
	 * 移动文件
	 * 
	 * @param target 源文件
	 * @param dest   目的文件/目录，如果最后一个为目录，则不改名，如果最后一个为文件名，则改名
	 * @return 是否操作成功
	 * @throws IOException IO 异常
	 */
	public static boolean move(String target, String dest) throws IOException {
		Files.copy(Paths.get(target), Paths.get(dest));
		return true;
	}

	/**
	 * 旧方法保存文本内容
	 * 
	 * @param fullpath
	 * @param content
	 * @throws IOException
	 */
	public static void saveClassic(String fullpath, String content) throws IOException {
		File file = new File(fullpath);
		if (file.isDirectory())
			throw new IOException("参数 fullpath：" + fullpath + " 不能是目录，请指定文件");

		try (FileOutputStream fop = new FileOutputStream(file)) {
			if (!file.exists())
				file.createNewFile();

			fop.write(content.getBytes());
			fop.flush();
		}
	}

	// Charset.forName("GBK");

	/**
	 * 遍历整个文件目录，递归的
	 * 
	 * @param _dir   指定的目录
	 * @param method 搜索函数
	 * @return 搜索结果
	 * @throws IOException
	 */
	public static List walkFileTree(String _dir, Predicate method) throws IOException {
		List result = new LinkedList<>();

		Path dir = Paths.get(_dir);
		if (!Files.isDirectory(dir))
			throw new IOException("参数 ：" + _dir + " 不是目录，请指定目录");

		Files.walkFileTree(dir, new SimpleFileVisitor() {
			@Override
			public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
				if (method.test(file))
					result.add(file);

				return FileVisitResult.CONTINUE;
			}
		});

		return result;
	}

	/**
	 * 遍历整个目录，非递归的
	 * 
	 * @param _dir   指定的目录
	 * @param method 搜索函数
	 * @return 搜索结果
	 * @throws IOException
	 */
	public static List walkFile(String _dir, Predicate method) throws IOException {
		List result = new LinkedList<>();

		Path dir = Paths.get(_dir);
		if (!Files.isDirectory(dir))
			throw new IOException("参数 ：" + _dir + " 不是目录，请指定目录");

		try (DirectoryStream stream = Files.newDirectoryStream(dir)) {
			for (Path e : stream) {
				if (method.test(e))
					result.add(e);
			}
		}

		return result;
	}

	static boolean get(Path p) {
//		System.out.println(p);
		return true;
	}

	public static void main(String[] args) throws IOException {

		walkFileTree("C:\\sp42\\sp42_share\\book\\", IoFileImpl::get);
		FunctionInterfaceTest f = p -> p + "ddf";

//		walk("C:\\sp42\\sp42_share\\book\\");

		System.out.println(f.getInfo("dsadsa"));

		FunctionInterfaceTest f2 = IoFileImpl::foo;
		System.out.println(f.getInfo("dsadsa"));
		System.out.println(f2.getInfo("foooooooo"));
	}

	public static String foo(String input) {
		return input + "sdsad";
	}

	@FunctionalInterface
	public interface FunctionInterfaceTest {
		public String getInfo(String input);
	}
}