How can I get file field url in drupal 7 from views of its content type?
It's not really clear what you mean by 'access' in this context, but if you're looking to get the details for a file uploaded through a file field:

$node = node_load(1);
if ( ($field_items = field_get_items('node', $node, 'field_file')) ) {
  $file = file_load($field_items[0]['fid']);

  $uri = $file-&gt;uri;
  $external_url = file_create_url($uri);
}


Or to grab the external URL directly with an EntityMetadataWrapper:

$node = node_load(1);
$wrapper = entity_metadata_wrapper('node', $node);
$external_url = $wrapper-&gt;field_files[0]-&gt;file-&gt;url-&gt;value();