asp.net用三种方法检测远程URL存在与否
2010-08-23 08:43
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用3种方法检测远程URL是否存在。
private void Page_Load(object sender, System.EventArgs e)
{
string url1 = "http://dotnet.aspx.cc/";
string url2 = "http://dotnet.aspx.cc/Images/logo.gif";
Response.Write("方法1:");
Response.Write(url1 + " 存在:" + UrlExistsUsingHttpWebRequest(url1).ToString());
Response.Write("方法2:");
Response.Write(url1 + " 存在:" + UrlExistsUsingSockets(url1).ToString());
Response.Write("方法3:");
Response.Write(url1 + " 存在:" + UrlExistsUsingXmlHttp(url1).ToString());
Response.Write("方法1:");
Response.Write(url2 + " 存在:" + UrlExistsUsingHttpWebRequest(url2).ToString());
Response.Write("方法3:");
Response.Write(url2 + " 存在:" + UrlExistsUsingXmlHttp(url2).ToString());
}
private bool UrlExistsUsingHttpWebRequest(string url){
try
{
System.Net.HttpWebRequest myRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
myRequest.Method = "HEAD";
myRequest.Timeout = 100;
System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)myRequest.GetResponse();
return (res.StatusCode == System.Net.HttpStatusCode.OK);
}
catch (System.Net.WebException we)
{
System.Diagnostics.Trace.Write(we.Message);
return false;
}
}
private bool UrlExistsUsingXmlHttp(string url)
{
//注意:此方法需要引用Msxml2.dll
MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
_xmlhttp.open("HEAD", url, false, null, null);
_xmlhttp.send("");
return (_xmlhttp.status == 200);
}
private bool UrlExistsUsingSockets(string url)
{
if (url.StartsWith("http://")) url = url.Remove(0, "http://".Length);
try
{
System.Net.IPHostEntry ipHost = System.Net.Dns.Resolve(url);
return true;
}
catch (System.Net.Sockets.SocketException se)
{
System.Diagnostics.Trace.Write(se.Message);
return false;
}
}
private void Page_Load(object sender, System.EventArgs e)
{
string url1 = "http://dotnet.aspx.cc/";
string url2 = "http://dotnet.aspx.cc/Images/logo.gif";
Response.Write("方法1:");
Response.Write(url1 + " 存在:" + UrlExistsUsingHttpWebRequest(url1).ToString());
Response.Write("方法2:");
Response.Write(url1 + " 存在:" + UrlExistsUsingSockets(url1).ToString());
Response.Write("方法3:");
Response.Write(url1 + " 存在:" + UrlExistsUsingXmlHttp(url1).ToString());
Response.Write("方法1:");
Response.Write(url2 + " 存在:" + UrlExistsUsingHttpWebRequest(url2).ToString());
Response.Write("方法3:");
Response.Write(url2 + " 存在:" + UrlExistsUsingXmlHttp(url2).ToString());
}
private bool UrlExistsUsingHttpWebRequest(string url){
try
{
System.Net.HttpWebRequest myRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
myRequest.Method = "HEAD";
myRequest.Timeout = 100;
System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)myRequest.GetResponse();
return (res.StatusCode == System.Net.HttpStatusCode.OK);
}
catch (System.Net.WebException we)
{
System.Diagnostics.Trace.Write(we.Message);
return false;
}
}
private bool UrlExistsUsingXmlHttp(string url)
{
//注意:此方法需要引用Msxml2.dll
MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
_xmlhttp.open("HEAD", url, false, null, null);
_xmlhttp.send("");
return (_xmlhttp.status == 200);
}
private bool UrlExistsUsingSockets(string url)
{
if (url.StartsWith("http://")) url = url.Remove(0, "http://".Length);
try
{
System.Net.IPHostEntry ipHost = System.Net.Dns.Resolve(url);
return true;
}
catch (System.Net.Sockets.SocketException se)
{
System.Diagnostics.Trace.Write(se.Message);
return false;
}
}
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