c#如何根据URL检查文件创建日期？

Question

我有一个指向XML文件的URL，是否有可能获取其创建日期

Answer 1

你可以那样做

Uri myUri = new Uri(url);

// Creates an HttpWebRequest for the specified URL. 
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(myUri); 
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();

DateTime today = DateTime.Now;
// Uses the LastModified property to compare with today's date.
if (DateTime.Compare(today,myHttpWebResponse.LastModified) == 0)
    Console.WriteLine("\nThe requested URI entity was modified today");
else
    if (DateTime.Compare(today,myHttpWebResponse.LastModified) == 1)
        Console.WriteLine("\nThe requested URI was last modified on:{0}",
                        myHttpWebResponse.LastModified);
    // Releases the resources of the response.

myHttpWebResponse.Close(); 

Answer 2

Yes可以使用CURLcurl_getinfo获取文件信息，而不必返回整个正文

范例

$curl = curl_init('URL_TO_XML');
curl_setopt($curl, CURLOPT_NOBODY, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_FILETIME, true);
$result = curl_exec($curl);
if ($result === false) {
    die (curl_error($curl)); 
}
$timestamp = curl_getinfo($curl, CURLINFO_FILETIME);
if ($timestamp != -1) { 
    echo date("Y-m-d H:i:s", $timestamp);
} 

Answer 3

否。
因为它是一个web url，您可能无法获得web服务器公开的更多信息