C#发送http请求

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Net;

using System.IO;

using System.Text;

using System.Runtime.InteropServices;

private string HttpPost(string Url, string postDataStr, CookieContainer cookie)

{

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

request.Method = "POST";

request.ContentType = "application/x-www-form-urlencoded";

request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);

request.CookieContainer = cookie;

Stream myRequestStream = request.GetRequestStream();

StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));

myStreamWriter.Write(postDataStr);

myStreamWriter.Close();

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

response.Cookies = cookie.GetCookies(response.ResponseUri);

Stream myResponseStream = response.GetResponseStream();

StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));

string retString = myStreamReader.ReadToEnd();

myStreamReader.Close();

myResponseStream.Close();

return retString;

}

public string HttpGet(string Url, string postDataStr)

{

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);

request.Method = "GET";

request.ContentType = "text/html;charset=UTF-8";

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

Stream myResponseStream = response.GetResponseStream();

StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));

string retString = myStreamReader.ReadToEnd();

myStreamReader.Close();

myResponseStream.Close();

return retString;

}

/// <summary>

/// 访问一个地址并返回cookie

/// </summary>

/// <param name="Url"></param>

/// <param name="postDataStr"></param>

/// <returns></returns>

public CookieContainer HttpGet(string Url)

{

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

request.Method = "GET";

request.ContentType = "text/html;charset=UTF-8";

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

return SetCookie(response);

}