c# WebClient 网站页面抓取(获取)的三种方法

.Net技术 码拜 7年前 (2014-08-07) 2234次浏览 0个评论

c#.net网站页面抓取(获取)的三种方法 :WebRequest /WebClient /webbrowser

using System.Net;

using System.IO;

using System.Text;

Response.Write(“方法一:<hr>”);

//方法一:

// Create a request for the URL.

WebRequest request = WebRequest.Create(“http://www.hao123.com”);

// If required by the server, set the credentials.

request.Credentials = CredentialCache.DefaultCredentials;

// Get the response.

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

// Display the status.

Response.Write(response.StatusDescription);

// Get the stream containing content returned by the server.

Stream dataStream = response.GetResponseStream();

// Open the stream using a StreamReader for easy access.

StreamReader reader = new StreamReader(dataStream, Encoding.Default);

// Read the content.

string responseFromServer = reader.ReadToEnd();

// Display the content.

Response.Write(responseFromServer);

// Cleanup the streams and the response.

reader.Close();

dataStream.Close();

response.Close();

Response.Write(“方法二:<hr>”);

//方法二:

WebClient client = new WebClient();

// Add a user agent header in case the

// requested URI contains a query.

client.Headers.Add(“user-agent”, “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)”);

Stream data = client.OpenRead(“http://www.hao123.com”);

StreamReader reader = new StreamReader(data, Encoding.Default);

string s = reader.ReadToEnd();

Response.Write(s);

data.Close();

reader.Close();

 

Response.Write(“方法三:<hr>”);

//方法三:

WebClient client = new WebClient();

//client.DownloadFile(“http://www.hao123.com”,”123.htm”);

string reply = client.DownloadString(“http://www.hao123.com”);

Response.Write(reply);


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