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
{
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.
