C#获取HTTP路径下的所有文件信息(可以做侦测了)

早上看到BBS上有这个贴子,"知道文件夹的路径 怎么把那个文件夹里的全部图片copy下来"

看到这样一个命题,首先想到是如何获取该路径下的全部的目录结构.我们有IE里有时是可以看到某个站点的目录结构的.如FTP不就是这样一个例子吗.首先该站点要支持目录浏览的功能.如果已关闭这个功能,那我暂时也想不出办法.

HTTP里我们常用get,post或head方法来获取站点的文件或相关信息.而这些对于上述要求是做不到的.这里使用了"PROPFIND"方法来实现该需求.有兴趣的话可以了解一下相关的资料.

话不多说了.直接上代码.

public class Resource<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

{

public string Name;

public bool IsFolder;

public string Url;

public DateTime LastModified;

}

public static SortedList GetDirectoryContents(string url, bool deep)

{

//Retrieve the File

HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(url);

Request.Headers.Add("Translate: f");

Request.Credentials = CredentialCache.DefaultCredentials;

string requestString = "<?xml version=/"1.0/" encoding=/"utf-8/" ?>" +

"<a:propfind xmlns:a=/"DAV:/">" +

"<a:prop>" +

"<a:displayname/>" +

"<a:iscollection/>" +

"<a:getlastmodified/>" +

"</a:prop>" +

"</a:propfind>";

Request.Method = "PROPFIND";

if (deep == true)

Request.Headers.Add("Depth: infinity");

else

Request.Headers.Add("Depth: 1");

Request.ContentLength = requestString.Length;

Request.ContentType = "text/xml";

Stream requestStream = Request.GetRequestStream();

requestStream.Write(Encoding.ASCII.GetBytes(requestString), 0, Encoding.ASCII.GetBytes(requestString).Length);

requestStream.Close();

HttpWebResponse Response;

StreamReader respStream;

try

{

Response = (HttpWebResponse)Request.GetResponse();

respStream = new StreamReader(Response.GetResponseStream());

}

catch (WebException e)

{

Debug.WriteLine("错误" + url);

throw e;

}

StringBuilder SB = new StringBuilder();

char[] respChar = new char[1024];

int BytesRead = 0;

BytesRead = respStream.Read(respChar, 0, 1024);

while (BytesRead > 0)

{

SB.Append(respChar, 0, BytesRead);

BytesRead = respStream.Read(respChar, 0, 1024);

}

respStream.Close();

XmlDocument XmlDoc = new XmlDocument();

XmlDoc.LoadXml(SB.ToString());

XmlNamespaceManager nsmgr = new XmlNamespaceManager(XmlDoc.NameTable);

nsmgr.AddNamespace("a", "DAV:");

XmlNodeList NameList = XmlDoc.SelectNodes("//a:prop/a:displayname", nsmgr);

XmlNodeList isFolderList = XmlDoc.SelectNodes("//a:prop/a:iscollection", nsmgr);

XmlNodeList LastModList = XmlDoc.SelectNodes("//a:prop/a:getlastmodified", nsmgr);

XmlNodeList HrefList = XmlDoc.SelectNodes("//a:href", nsmgr);

SortedList ResourceList = new SortedList();

Resource tempResource;

for (int i = 0; i < NameList.Count; i++)

{

if (HrefList[i].InnerText.ToLower(new CultureInfo("en-US")).TrimEnd(new char[] { '/' }) != url.ToLower(new CultureInfo("en-US")).TrimEnd(new char[] { '/' }))

{

tempResource = new Resource();

tempResource.Name = NameList[i].InnerText;

tempResource.IsFolder = Convert.ToBoolean(Convert.ToInt32(isFolderList[i].InnerText));

tempResource.Url = HrefList[i].InnerText;

tempResource.LastModified = Convert.ToDateTime(LastModList[i].InnerText);

ResourceList.Add(tempResource.Url, tempResource);

}

}

return ResourceList;

}

主要利用了WebDAV 的功能来实现.请把站点的目录浏览权限给打开,使用时调用上面的方法即可获取相关的信息.如果想下载的话,那可以根据获取的URL再次进行下载.