Java设置文件用户名和组

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    Files.createDirectories(dir.toPath());

    UserPrincipalLookupService lookupService = FileSystems.getDefault().getUserPrincipalLookupService();

    UserPrincipal user = lookupService.lookupPrincipalByName(sftpUser);
    Files.setOwner(dir.toPath(), user);

    GroupPrincipal group = lookupService.lookupPrincipalByGroupName("users");
    Files.getFileAttributeView(dir.toPath(), PosixFileAttributeView.class, LinkOption.NOFOLLOW_LINKS).setGroup(group);