C# 写的 HttpRequsetResponse 类,异步、事件... 还热乎着呢!

//调用示例:
/*
2003-7-1
1.支持Proxy
2.可指定同步或异步
3.一些小修改
*/

private void button1_Click(object sender, System.EventArgs e)
?{
??HttpRequestResponse xx = new HttpRequestResponse();
??xx.DataArrival += new DataArrivalEventHandler(xx_DataArrival);
??//xx.SendRequest(@"http://localhost:2080/examples/myservlets/servlet2","message=QQ&desttel=13910911925&mytel=13910081138&mypwd=263996211");
??xx.SendRequest(@"http://localhost","message=你好QQ&desttel=13910911925&mytel=13910081138&mypwd=263996211","GET",true);
??xx.SendRequest("http://localhost/quickstart/util/srcview.aspx?path=/quickstart/howto/samples/net/WebRequests/clientGETasync.src","post",false);
?}
private int i=0;
private void xx_DataArrival(object sender, DataArrivalEventArgs e)
?{
??Console.WriteLine( i++);
??Console.Write(e.RecievedData? );
??if (e.IsComplete)
???{
???Console.Write("[" + ((HttpRequestResponse) sender).Request.CookieContainer.GetCookieHeader(((HttpRequestResponse) sender).Response.ResponseUri).ToString() + "]");
???}
??}

//========================
//Class1.cs

using System;
using System.Net;
using System.Threading;
using System.Text;
using System.IO;

public class RequestState
{
?const int BUFFER_SIZE = 1024;
?public System.Text.StringBuilder RequestData;
?public byte[] BufferRead;
?public System.Net.HttpWebRequest Request;
?public System.IO.Stream ResponseStream;
?public System.Text.Decoder StreamDecode = System.Text.Encoding.GetEncoding("gb2312").GetDecoder();
?public RequestState()
?{
??BufferRead = new byte[BUFFER_SIZE];
??RequestData = new System.Text.StringBuilder("");
??Request = null;
??ResponseStream = null;
?}
}
public delegate void DataArrivalEventHandler(object sender, DataArrivalEventArgs e);
public class DataArrivalEventArgs : System.EventArgs
{
?private string mRecievedData;
?private bool mIsComplete = false;
?public DataArrivalEventArgs(string Data,bool Complete)
?{
??mRecievedData = Data;
??mIsComplete = Complete;
?}
?public string RecievedData
?{
??get
??{
???return mRecievedData;
??}
?}
?public bool IsComplete
?{
??get
??{
???return mIsComplete;
??}
?}
}

class HttpRequestResponse
{
?public static System.Threading.ManualResetEvent allDone = new System.Threading.ManualResetEvent(false);
?const int BUFFER_SIZE = 1024;
?public event DataArrivalEventHandler DataArrival;

?protected virtual void OnDataArrival(DataArrivalEventArgs e)
?{
??if (DataArrival != null)
??{
???DataArrival(this, e);
??}
?}
?private System.Text.Encoding mRequestEncoding = System.Text.Encoding.GetEncoding("gb2312");
?private bool mUseProxy = false;
?public bool UseProxy
?{
??get
??{
???return mUseProxy;
??}
??set
??{
???mUseProxy = value;
??}
?}

?private System.Net.WebProxy mWP = System.Net.WebProxy.GetDefaultProxy();
?public System.Net.WebProxy Proxy
?{
??get
??{
???return mWP;
??}
??set
??{
???mWP = value;
??}
?}

?private System.Net.HttpWebRequest mHWReq = null;
?public System.Net.HttpWebRequest Request
?{
??get
??{
???return mHWReq;
??}
?}
?
?private System.Net.HttpWebResponse mHWRsp = null;
?public System.Net.HttpWebResponse Response
?{
??get
??{
???return mHWRsp;
??}
?}
?public void SendRequest(string RequestURL,string RequestData,bool Async)
?{
??SendRequest(RequestURL,RequestData,"GET",Async);
?}
?public void SendRequest(string RequestURL,string RequestData,string RequestMethod,bool Async)
?{
??HttpWebRequest req;
??RequestState rs = new RequestState();
??if (RequestData != null)
??{
???int i=0, j;
???Char[] reserved = {'?', '=', '&'};
???while(i<requestdata.length>???{<br>????j=RequestData.IndexOfAny(reserved, i);<br>????if (j==-1)<br>????{<br>?????rs.RequestData.Append(System.Web.HttpUtility.UrlEncode(RequestData.Substring(i, RequestData.Length-i),mRequestEncoding));<br>?????break;<br>????}<br>????rs.RequestData.Append(System.Web.HttpUtility.UrlEncode(RequestData.Substring(i, j-i),mRequestEncoding));<br>????rs.RequestData.Append(RequestData.Substring(j,1));<br>????i = j+1;<br>???}<br>??}<br>??if (RequestMethod.ToUpper() == "POST")<br>??{<br>???byte[] Buffer = null;<br>???Buffer = mRequestEncoding.GetBytes(rs.RequestData.ToString());<br>???req =(HttpWebRequest) WebRequest.Create(RequestURL);<br>???req.ContentLength = Buffer.Length;<br>???req.Method = RequestMethod;<br>???req.ContentType = "application/x-www-form-urlencoded";<br>???Stream newStream = req.GetRequestStream();<br>???newStream.Write(Buffer, 0, Buffer.Length);<br>???newStream.Close();<br>??}<br>??else<br>??{<br>???req =(HttpWebRequest) WebRequest.Create(RequestURL + "?" + rs.RequestData.ToString());<br>??}<br>??req.Credentials = CredentialCache.DefaultCredentials;<br>??req.UserAgent = "<a href="mailto:[e-mail]">[e-mail]</a>";<br>??req.KeepAlive = true;<br>??req.Headers.Set("Pragma", "no-cache");<br>??req.Timeout = 300000;<br>??if (mUseProxy)<br>??{<br>???if (mWP == null)<br>????mWP = System.Net.WebProxy.GetDefaultProxy();<br>???GlobalProxySelection.Select = mWP;<br>??}<br>??rs.Request = req;<br>??mHWReq = req;<br>??<br>??System.IAsyncResult r = (System.IAsyncResult) req.BeginGetResponse(new System.AsyncCallback(ResponseCallback), rs);<br>??if (!Async)<br>???allDone.WaitOne();<br>?}</requestdata.length>

?private void ResponseCallback(IAsyncResult ar)
?{
??RequestState rs = (RequestState) ar.AsyncState;
??System.Net.HttpWebRequest req = rs.Request;
??System.Net.HttpWebResponse resp = (System.Net.HttpWebResponse) req.EndGetResponse(ar);
??System.IO.Stream ResponseStream = resp.GetResponseStream();
??rs.ResponseStream = ResponseStream;
??IAsyncResult iarRead = ResponseStream.BeginRead(rs.BufferRead, 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), rs);
?}

?private void ReadCallBack(IAsyncResult asyncResult)
?{
??RequestState rs = (RequestState)asyncResult.AsyncState;
??System.IO.Stream responseStream = rs.ResponseStream;
??int read = responseStream.EndRead( asyncResult );
??if (read > 0)
??{
???Char[] charBuffer = new Char[BUFFER_SIZE];
???int len = rs.StreamDecode.GetChars( rs.BufferRead, 0, read, charBuffer, 0 );
???System.String str = new System.String( charBuffer, 0, len);
???OnDataArrival(new DataArrivalEventArgs(str,false));
???rs.RequestData.Append(str);
???IAsyncResult ar = responseStream.BeginRead( rs.BufferRead, 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), rs);
??}
??else
??{
???if(rs.RequestData.Length>1)
???{
????string strContent;
????strContent = rs.RequestData.ToString();
???}
???responseStream.Close();
???allDone.Set();
???OnDataArrival(new DataArrivalEventArgs("/n",true));
??}
??return;
?}
}