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public class IO5 {
    public static void main(String[] args) throws IOException {
        //拷贝文件夹
        //首先先有这样一个文件夹
        File file = new File("src/com/liu");
        copy(file);
    }

    private static void copy(File file) throws IOException {
        //新文件夹
        // 1. 先获取文件夹的名字
        String path = "aaa/" + file.getName();
        // 2. 创建文件夹要存储的路径File对象
        File dir = new File(path);
        // 3. 创建文件夹
        dir.mkdirs();
        //原来文件夹下的所有内容
        File[] files = file.listFiles();
        for (File f : files) {
            if (f.isDirectory()) {
                copy(f);
            } else {
                // 为文件创建一个读取流
                FileInputStream fis = new FileInputStream(f);
                int b;
                while ((b = fis.read()) != -1) {
                    File destionation = new File(path + "/" + f.getName());
                    destionation.createNewFile();
                    FileOutputStream fos = new FileOutputStream(destionation);
                    fos.write(b);
                }
            }
        }
    }
}

public class IO6 {
    public static void main(String[] args) throws IOException {
        File from = new File("src/com/liu");
        File to = new File("bbb");
        copy(from, to);
    }

    private static void copy(File from, File to) throws IOException {
        // 创建新的目标文件夹
        File newDir = new File(to, from.getName());
        newDir.mkdirs(); 

        // 处理原文件夹下的所有内容
        File[] files = from.listFiles();
        for (File f : files) {
            if (f.isDirectory()) {
                copy(f, newDir);  // 递归处理子文件夹
            } else {
                // 为文件创建读取流和写入流
                FileInputStream fis = new FileInputStream(f);
                FileOutputStream fos = new FileOutputStream(new File(newDir, f.getName()));

                // 使用缓冲区提高效率
                byte[] buffer = new byte[1024];
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    fos.write(buffer, 0, length);
                }

                // 关闭流
                fos.close();
                fis.close();
            }
        }
    }
}

public class IO7 {
    public static void main(String[] args) throws IOException {
        // 要读取的文件肯定是要存在的
        FileInputStream fis = new FileInputStream("C:\\Users\\Administrator\\Desktop\\image-20240722173741395.png");
        // 要写入到哪里
        FileOutputStream fos = new FileOutputStream("111");
        int b;
        while((b = fis.read()) != -1) {
            fos.write(b ^ 10);
        }
        fos.close();
        fis.close();
    }
}

public class IO8 {
    public static void main(String[] args) throws IOException {
        // 要读取的文件
        FileInputStream fis = new FileInputStream("111");
        // 要写入到哪里
        FileOutputStream fos = new FileOutputStream("222.png");
        int b;
        while((b = fis.read()) != -1) {
            fos.write(b ^ 10);
        }
        fos.close();
        fis.close();
    }
}