移动文件 Path source = Paths.get("helloword/data.txt"); Path target = Paths.get("helloword/data.txt");
Files.move(source, target, StandardCopyOption.ATOMIC_MOVE);
StandardCopyOption.ATOMIC_MOVE 保证文件移动的原子性
删除文件
Path target = Paths.get("helloword/target.txt");
Files.delete(target); 如果文件不存在，会抛异常 NoSuchFileException
删除目录
Path target = Paths.get("helloword/d1");
Files.delete(target); 如果目录还有内容，会抛异常 DirectoryNotEmptyException
