Copying a File or Directory复制文件或目录

You can copy a file or directory by using the copy(Path, Path, CopyOption...) method. 您可以使用copy(Path, Path, CopyOption...)方法复制文件或目录。The copy fails if the target file exists, unless the REPLACE_EXISTING option is specified.如果目标文件存在，则复制失败，除非指定了REPLACE_EXISTING选项。

Directories can be copied. 可以复制目录。However, files inside the directory are not copied, so the new directory is empty even when the original directory contains files.但是，目录中的文件不会被复制，因此即使原始目录包含文件，新目录也是空的。

When copying a symbolic link, the target of the link is copied. 复制符号链接时，将复制链接的目标。If you want to copy the link itself, and not the contents of the link, specify either the NOFOLLOW_LINKS or REPLACE_EXISTING option.如果要复制链接本身而不是链接的内容，请指定NOFOLLOW_LINKS或REPLACE_EXISTING选项。

This method takes a varargs argument. 此方法采用varargs参数。The following StandardCopyOption and LinkOption enums are supported:支持以下StandardCopyOption和LinkOption枚举：

• REPLACE_EXISTING – Performs the copy even when the target file already exists. 即使目标文件已存在，也会执行复制。If the target is a symbolic link, the link itself is copied (and not the target of the link). 如果目标是符号链接，则复制链接本身（而不是链接的目标）。If the target is a non-empty directory, the copy fails with the DirectoryNotEmptyException exception.如果目标是非空目录，则复制将失败，并出现DirectoryNotEmptyException异常。
• COPY_ATTRIBUTES – Copies the file attributes associated with the file to the target file. 将与文件关联的文件属性复制到目标文件。The exact file attributes supported are file system and platform dependent, but last-modified-time is supported across platforms and is copied to the target file.支持的确切文件属性取决于文件系统和平台，但跨平台支持last-modified-time，并将其复制到目标文件。
• NOFOLLOW_LINKS – Indicates that symbolic links should not be followed. 指示不应遵循符号链接。If the file to be copied is a symbolic link, the link is copied (and not the target of the link).如果要复制的文件是符号链接，则会复制该链接（而不是链接的目标）。

If you are not familiar with enums, see Enum Types.如果不熟悉enums，请参阅枚举类型。

The following shows how to use the copy method:下面显示了如何使用copy方法：

import static java.nio.file.StandardCopyOption.*;
...
Files.copy(source, target, REPLACE_EXISTING);

In addition to file copy, the Files class also defines methods that may be used to copy between a file and a stream. 除了文件复制之外，Files类还定义了可用于在文件和流之间复制的方法。The copy(InputStream, Path, CopyOptions...) method may be used to copy all bytes from an input stream to a file. copy(InputStream, Path, CopyOptions...)方法可用于将输入流中的所有字节复制到文件中。The copy(Path, OutputStream) method may be used to copy all bytes from a file to an output stream.copy(Path, OutputStream)方法可用于将文件中的所有字节复制到输出流。

The Copy example uses the copy and Files.walkFileTree methods to support a recursive copy. Copy示例使用copy和Files.walkFileTree方法支持递归复制。See Walking the File Tree for more information.有关详细信息，请参阅遍历文件树。