java.io.File.lastModified 对于链接，获取链接文件的lastModified，而不是链接文件

Question

$ touch file1.txt; sleep 60; ln -s file1.txt file2.txt; ls -l
$ -rw-r--r--   1 david  staff    0 Mar 29 22:58 file1.txt
$ lrwxr-xr-x   1 david  staff    9 Mar 29 22:59 file2.txt -> file1.txt

但是，这两个语句返回 file1.txt 的时间戳:

new java.io.File("file1.txt").lastModified()  // Mar 29 22:58
new java.io.File("file2.txt").lastModified()  // Mar 29 22:58

所以，file2.txt正在获取lastModified来自其链接文件的信息。

与java.nio.file.Files有同样的问题:

Files.readAttributes(new java.io.File("file2.txt").toPath(), classOf[PosixFileAttributes]).lastModifiedTime.toMillis

所以，在Java/Scala中，当我有一个链接文件时，如何获取 lastModifiedTime (和 Files.readAttributes.permissions )链接文件本身(而不是链接文件)，如 ls -l 中所示命令？

Answer 1

java.nio.file.Files 的 Javadoc:

public static FileTime getLastModifiedTime(Path path,
                                       LinkOption... options)
                                throws IOException

Returns a file's last modified time.

The options array may be used to indicate how symbolic links are handled for the case that the file is a symbolic link. By default, symbolic links are followed and the file attribute of the final target of the link is read. If the option NOFOLLOW_LINKS is present then symbolic links are not followed.