如何在 Windows 上使用 java NIO2 设置文件权限？

Question

Are there any ways of setting file permissions using java8 NIO2 on Windows different from this?

file.setReadable(false, false);
file.setExecutable(false, false);
file.setWritable(false, false);

Answer 1

The File methods that set various attributes: setExecutable , setReadable , setReadOnly , setWritable are replaced by the Files method setAttribute(Path, String, Object, LinkOption...) .

Usage Example:

public void setFileAttributes() throws IOException {
  Path path = ...

  UserPrincipal user = path.getFileSystem().getUserPrincipalLookupService().lookupPrincipalByName("user");
  AclFileAttributeView view = Files.getFileAttributeView(path, AclFileAttributeView.class);
  AclEntry entry = AclEntry.newBuilder()
          .setType(ALLOW)
          .setPrincipal(user)
          .setPermissions(Set.of(READ_DATA, EXECUTE, WRITE_DATA))
          .build();
  List<AclEntry> acl = view.getAcl();
  acl.add(0, entry);

  Files.setAttribute(path, "acl:acl", acl);
}

See AclFileAttributeView for more details.