import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.channels.SeekableByteChannel;

import java.nio.file.DirectoryStream;

import java.nio.file.Files;

import java.nio.file.LinkOption;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.nio.file.StandardCopyOption;

import java.nio.file.StandardOpenOption;

import java.nio.file.attribute.BasicFileAttributes;

import java.nio.file.attribute.DosFileAttributeView;

import org.junit.Test;

public class TestNIO_2 {

    //自动资源管理：自动关闭实现 AutoCloseable 接口的资源

    @Test

    public void test8(){

        try(FileChannel inChannel = FileChannel.open(Paths.get("1.jpg"), StandardOpenOption.READ);

                FileChannel outChannel = FileChannel.open(Paths.get("2.jpg"), StandardOpenOption.WRITE, StandardOpenOption.CREATE)){

            ByteBuffer buf = ByteBuffer.allocate(1024);

            inChannel.read(buf);

        }catch(IOException e){

        }

    }

    /*

        Files常用方法：用于操作内容

            SeekableByteChannel newByteChannel(Path path, OpenOption…how) : 获取与指定文件的连接，how 指定打开方式。

            DirectoryStream newDirectoryStream(Path path) : 打开 path 指定的目录

            InputStream newInputStream(Path path, OpenOption…how):获取 InputStream 对象

            OutputStream newOutputStream(Path path, OpenOption…how) : 获取 OutputStream 对象

     */

    @Test

    public void test7() throws IOException{

        SeekableByteChannel newByteChannel = Files.newByteChannel(Paths.get("1.jpg"), StandardOpenOption.READ);

        DirectoryStream<Path> newDirectoryStream = Files.newDirectoryStream(Paths.get("e:/"));

        for (Path path : newDirectoryStream) {

            System.out.println(path);

        }

    }

    /*

        Files常用方法：用于判断

            boolean exists(Path path, LinkOption … opts) : 判断文件是否存在

            boolean isDirectory(Path path, LinkOption … opts) : 判断是否是目录

            boolean isExecutable(Path path) : 判断是否是可执行文件

            boolean isHidden(Path path) : 判断是否是隐藏文件

            boolean isReadable(Path path) : 判断文件是否可读

            boolean isWritable(Path path) : 判断文件是否可写

            boolean notExists(Path path, LinkOption … opts) : 判断文件是否不存在

            public static <A extends BasicFileAttributes> A readAttributes(Path path,Class<A> type,LinkOption... options) : 获取与 path 指定的文件相关联的属性。

     */

    @Test

    public void test6() throws IOException{

        Path path = Paths.get("e:/nio/hello7.txt");

//        System.out.println(Files.exists(path, LinkOption.NOFOLLOW_LINKS));

        BasicFileAttributes readAttributes = Files.readAttributes(path, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);

        System.out.println(readAttributes.creationTime());

        System.out.println(readAttributes.lastModifiedTime());

        DosFileAttributeView fileAttributeView = Files.getFileAttributeView(path, DosFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);

        fileAttributeView.setHidden(false);

    }

    /*

        Files常用方法：

            Path copy(Path src, Path dest, CopyOption … how) : 文件的复制

            Path createDirectory(Path path, FileAttribute<?> … attr) : 创建一个目录

            Path createFile(Path path, FileAttribute<?> … arr) : 创建一个文件

            void delete(Path path) : 删除一个文件

            Path move(Path src, Path dest, CopyOption…how) : 将 src 移动到 dest 位置

            long size(Path path) : 返回 path 指定文件的大小

     */

    @Test

    public void test5() throws IOException{

        Path path1 = Paths.get("e:/nio/hello2.txt");

        Path path2 = Paths.get("e:/nio/hello7.txt");

        System.out.println(Files.size(path2));

//        Files.move(path1, path2, StandardCopyOption.ATOMIC_MOVE);

    }

    @Test

    public void test4() throws IOException{

        Path dir = Paths.get("e:/nio/nio2");

//        Files.createDirectory(dir);

        Path file = Paths.get("e:/nio/nio2/hello3.txt");

//        Files.createFile(file);

        Files.deleteIfExists(file);

    }

    @Test

    public void test3() throws IOException{

        Path path1 = Paths.get("e:/nio/hello.txt");

        Path path2 = Paths.get("e:/nio/hello2.txt");

        Files.copy(path1, path2, StandardCopyOption.REPLACE_EXISTING);

    }

    /*

        Paths 提供的 get() 方法用来获取 Path 对象：

            Path get(String first, String … more) : 用于将多个字符串串连成路径。

        Path 常用方法：

            boolean endsWith(String path) : 判断是否以 path 路径结束

            boolean startsWith(String path) : 判断是否以 path 路径开始

            boolean isAbsolute() : 判断是否是绝对路径

            Path getFileName() : 返回与调用 Path 对象关联的文件名

            Path getName(int idx) : 返回的指定索引位置 idx 的路径名称

            int getNameCount() : 返回Path 根目录后面元素的数量

            Path getParent() ：返回Path对象包含整个路径，不包含 Path 对象指定的文件路径

            Path getRoot() ：返回调用 Path 对象的根路径

            Path resolve(Path p) :将相对路径解析为绝对路径

            Path toAbsolutePath() : 作为绝对路径返回调用 Path 对象

            String toString() ： 返回调用 Path 对象的字符串表示形式

     */

    @Test

    public void test2(){

        Path path = Paths.get("e:/nio/hello.txt");

        System.out.println(path.getParent());

        System.out.println(path.getRoot());

//        Path newPath = path.resolve("e:/hello.txt");

//        System.out.println(newPath);

        Path path2 = Paths.get("1.jpg");

        Path newPath = path2.toAbsolutePath();

        System.out.println(newPath);

        System.out.println(path.toString());

    }

    @Test

    public void test1(){

        Path path = Paths.get("e:/", "nio/hello.txt");

        System.out.println(path.endsWith("hello.txt"));

        System.out.println(path.startsWith("e:/"));

        System.out.println(path.isAbsolute());

        System.out.println(path.getFileName());

        for (int i = 0; i < path.getNameCount(); i++) {

            System.out.println(path.getName(i));

        }

    }

}