asp.net下检测远程URL是否存在的三种方法

时间:2021-05-28

复制代码 代码如下:
private void Page_Load(object sender, System.EventArgs e)
{
string url1 = "http://s.jb51.net/";
string url2 = "https://www.jb51.net/images/logo.gif";
Response.Write("<li>方法1:");
Response.Write(url1 + " 存在:" + UrlExistsUsingHttpWebRequest(url1).ToString());
Response.Write("<li>方法2:");
Response.Write(url1 + " 存在:" + UrlExistsUsingSockets(url1).ToString());
Response.Write("<li>方法3:");
Response.Write(url1 + " 存在:" + UrlExistsUsingXmlHttp(url1).ToString());
Response.Write("<li>方法1:");
Response.Write(url2 + " 存在:" + UrlExistsUsingHttpWebRequest(url2).ToString());
Response.Write("<li>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;
}
}

声明:本页内容来源网络,仅供用户参考;我单位不保证亦不表示资料全面及准确无误,也不保证亦不表示这些资料为最新信息,如因任何原因,本网内容或者用户因倚赖本网内容造成任何损失或损害,我单位将不会负任何法律责任。如涉及版权问题,请提交至online#300.cn邮箱联系删除。

相关文章