C#实现http协议支持上传下载文件的GET、POST请求

C#实现http协议支持上传下载文件的GET、POST请求
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Collections;
using System.IO;
using System.Text.RegularExpressions;
using RE = System.Text.RegularExpressions.Regex;
using System.Security.Cryptography.X509Certificates;

/***************************************************************************************************************************************************
* *文件名：HttpProc.cs
* *创建人：HeDaode
* *日 期：2007.09.01
* *描 述：实现HTTP协议中的GET、POST请求
* *使 用：HttpProc.WebClient client = new HttpProc.WebClient();
client.Encoding = System.Text.Encoding.Default;//默认编码方式，根据需要设置其他类型
client.OpenRead("http://www.baidu.com");//普通get请求
MessageBox.Show(client.RespHtml);//获取返回的网页源代码
client.DownloadFile("http://www.loopc.com/upload/163album.rar",@"C:/163album.rar");//下载文件
client.OpenRead("http://passport.baidu.com/?login","username=zhangsan&password=123456");//提交表单，此处是登录百度的示例
client.UploadFile("http://hiup.baidu.com/zhangsan/upload", @"file1=D:/1.mp3");//上传文件
client.UploadFile("http://hiup.baidu.com/zhangsan/upload", "folder=myfolder&size=4003550",@"file1=D:/1.mp3");//提交含文本域和文件域的表单
*****************************************************************************************************************************************************/

namespace HttpProc
{
///<summary>
///上传事件委托
///</summary>
///<param name="sender"></param>
///<param name="e"></param>
public delegate void WebClientUploadEvent(object sender, HttpProc.UploadEventArgs e);

///<summary>
///下载事件委托
///</summary>
///<param name="sender"></param>
///<param name="e"></param>
public delegate void WebClientDownloadEvent(object sender, HttpProc.DownloadEventArgs e);


///<summary>
///上传事件参数
///</summary>
public struct UploadEventArgs
{
///<summary>
///上传数据总大小
///</summary>
public long totalBytes;
///<summary>
///已发数据大小
///</summary>
public long bytesSent;
///<summary>
///发送进度(0-1)
///</summary>
public double sendProgress;
///<summary>
///发送速度Bytes/s
///</summary>
public double sendSpeed;
}

///<summary>
///下载事件参数
///</summary>
public struct DownloadEventArgs
{
///<summary>
///下载数据总大小
///</summary>
public long totalBytes;
///<summary>
///已接收数据大小
///</summary>
public long bytesReceived;
///<summary>
///接收数据进度(0-1)
///</summary>
public double ReceiveProgress;
///<summary>
///当前缓冲区数据
///</summary>
public byte[] receivedBuffer;
///<summary>
///接收速度Bytes/s
///</summary>
public double receiveSpeed;
}

///<summary>
///实现向WEB服务器发送和接收数据
///</summary>
public class WebClient
{
private WebHeaderCollection requestHeaders, responseHeaders;
private TcpClient clientSocket;
private MemoryStream postStream;
private Encoding encoding = Encoding.Default;
private const string BOUNDARY = "--HEDAODE--";
private const int SEND_BUFFER_SIZE = 10245;
private const int RECEIVE_BUFFER_SIZE = 10245;
private string cookie = "";
private string respHtml = "";
private string strRequestHeaders = "";
private string strResponseHeaders = "";
private int statusCode = 0;
private bool isCanceled = false;
public event WebClientUploadEvent UploadProgressChanged;
public event WebClientDownloadEvent DownloadProgressChanged;

///<summary>
///初始化WebClient类
///</summary>
public WebClient()
{
responseHeaders = new WebHeaderCollection();
requestHeaders = new WebHeaderCollection();
}


///<summary>
///读取指定URL的文本
///</summary>
///<param name="URL">请求的地址</param>
///<returns>服务器响应文本</returns>
public string OpenRead(string URL)
{
requestHeaders.Add("Connection", "close");
SendRequestData(URL, "GET");
return GetHtml();
}


//解决证书过期无法访问的问题
class CertPolicy : ICertificatePolicy
{
public bool CheckValidationResult(ServicePoint srvpt, X509Certificate cert, WebRequest req, int certprb)
{ return true; }
}

///<summary>
///采用https协议访问网络
///</summary>
///<param name="URL">url地址</param>
///<param name="strPostdata">发送的数据</param>
///<returns></returns>
public string OpenReadWithHttps(string URL,string strPostdata)
{
ServicePointManager.CertificatePolicy = new CertPolicy();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
request.CookieContainer = new CookieContainer();
request.Method = "POST";
request.Accept = "*/*";
request.ContentType="application/x-www-form-urlencoded";
byte[] buffer = this.encoding.GetBytes(strPostdata);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream(), encoding);
this.respHtml = reader.ReadToEnd();
foreach (System.Net.Cookie ck in response.Cookies)
{
this.cookie += ck.Name + "=" + ck.Value + ";";
}
reader.Close();
return respHtml;
}

///<summary>
///读取指定URL的文本
///</summary>
///<param name="URL">请求的地址</param>
///<param name="postData">向服务器发送的文本数据</param>
///<returns>服务器响应文本</returns>
public string OpenRead(string URL, string postData)
{
byte[] sendBytes = encoding.GetBytes(postData);
postStream = new MemoryStream();
postStream.Write(sendBytes, 0, sendBytes.Length);

requestHeaders.Add("Content-Length", postStream.Length.ToString());
requestHeaders.Add("Content-Type", "application/x-www-form-urlencoded");
requestHeaders.Add("Connection", "close");

SendRequestData(URL, "POST");
return GetHtml();
}


///<summary>
///读取指定URL的流
///</summary>
///<param name="URL">请求的地址</param>
///<param name="postData">向服务器发送的数据</param>
///<returns>服务器响应流</returns>
public Stream GetStream(string URL, string postData)
{
byte[] sendBytes = encoding.GetBytes(postData);
postStream = new MemoryStream();
postStream.Write(sendBytes, 0, sendBytes.Length);

requestHeaders.Add("Content-Length", postStream.Length.ToString());
requestHeaders.Add("Content-Type", "application/x-www-form-urlencoded");
requestHeaders.Add("Connection", "close");

SendRequestData(URL, "POST");

MemoryStream ms = new MemoryStream();
SaveNetworkStream(ms);
return ms;
}


///<summary>
///上传文件到服务器
///</summary>
///<param name="URL">请求的地址</param>
///<param name="fileField">文件域(格式如:file1=C:/test.mp3&file2=C:/test.jpg)</param>
///<returns>服务器响应文本</returns>
public string UploadFile(string URL, string fileField)
{
return UploadFile(URL, "", fileField);
}

///<summary>
///上传文件和数据到服务器
///</summary>
///<param name="URL">请求地址</param>
///<param name="textField">文本域(格式为:name1=value1&name2=value2)</param>
///<param name="fileField">文件域(格式如:file1=C:/test.mp3&file2=C:/test.jpg)</param>
///<returns>服务器响应文本</returns>
public string UploadFile(string URL, string textField, string fileField)
{
postStream = new MemoryStream();

if (textField != "" && fileField != "")
{
WriteTextField(textField);
WriteFileField(fileField);
}
else if (fileField != "")
{
WriteFileField(fileField);
}
else if (textField != "")
{
WriteTextField(textField);
}
else
throw new Exception("文本域和文件域不能同时为空。");

//写入结束标记
byte[] buffer = encoding.GetBytes("--" + BOUNDARY + "--/r/n");
postStream.Write(buffer, 0, buffer.Length);

//添加请求标头
requestHeaders.Add("Content-Length", postStream.Length.ToString());
requestHeaders.Add("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
requestHeaders.Add("Connection", "Keep-Alive");

//发送请求数据
SendRequestData(URL, "POST", true);

//返回响应文本
return GetHtml();
}


///<summary>
///分析文本域，添加到请求流
///</summary>
///<param name="textField">文本域</param>
private void WriteTextField(string textField)
{
string[] strArr = RE.Split(textField, "&");
textField = "";
foreach (string var in strArr)
{
Match M = RE.Match(var, "([^=]+)=(.+)");
textField += "--" + BOUNDARY + "/r/n";
textField += "Content-Disposition: form-data; name=/"" + M.Groups[1].Value + "/"/r/n/r/n" + M.Groups[2].Value + "/r/n";
}
byte[] buffer = encoding.GetBytes(textField);
postStream.Write(buffer, 0, buffer.Length);
}

///<summary>
///分析文件域，添加到请求流
///</summary>
///<param name="fileField">文件域</param>
private void WriteFileField(string fileField)
{
string filePath = "";
int count = 0;
string[] strArr = RE.Split(fileField, "&");
foreach (string var in strArr)
{
Match M = RE.Match(var, "([^=]+)=(.+)");
filePath = M.Groups[2].Value;
fileField = "--" + BOUNDARY + "/r/n";
fileField += "Content-Disposition: form-data; name=/"" + M.Groups[1].Value + "/"; filename=/"" + Path.GetFileName(filePath) + "/"/r/n";
fileField += "Content-Type: image/jpeg/r/n/r/n";

byte[] buffer = encoding.GetBytes(fileField);
postStream.Write(buffer, 0, buffer.Length);

//添加文件数据
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
buffer = new byte[50000];

do
{
count = fs.Read(buffer, 0, buffer.Length);
postStream.Write(buffer, 0, count);

} while (count > 0);

fs.Close();
fs.Dispose();
fs = null;

buffer = encoding.GetBytes("/r/n");
postStream.Write(buffer, 0, buffer.Length);
}
}

///<summary>
///从指定URL下载数据流
///</summary>
///<param name="URL">请求地址</param>
///<returns>数据流</returns>
public Stream DownloadData(string URL)
{
requestHeaders.Add("Connection", "close");
SendRequestData(URL, "GET");
MemoryStream ms = new MemoryStream();
SaveNetworkStream(ms, true);
return ms;
}


///<summary>
///从指定URL下载文件
///</summary>
///<param name="URL">文件URL地址</param>
///<param name="fileName">文件保存路径,含文件名(如:C:/test.jpg)</param>
public void DownloadFile(string URL, string fileName)
{
requestHeaders.Add("Connection", "close");
SendRequestData(URL, "GET");
FileStream fs = new FileStream(fileName, FileMode.Create);
SaveNetworkStream(fs, true);
fs.Close();
fs = null;
}

///<summary>
///向服务器发送请求
///</summary>
///<param name="URL">请求地址</param>
///<param name="method">POST或GET</param>
///<param name="showProgress">是否显示上传进度</param>
private void SendRequestData(string URL, string method, bool showProgress)
{
clientSocket = new TcpClient();
Uri URI = new Uri(URL);
clientSocket.Connect(URI.Host, URI.Port);

requestHeaders.Add("Host", URI.Host);
byte[] request = GetRequestHeaders(method + " " + URI.PathAndQuery + " HTTP/1.1");
clientSocket.Client.Send(request);

//若有实体内容就发送它
if (postStream != null)
{
byte[] buffer = new byte[SEND_BUFFER_SIZE];
int count = 0;
Stream sm = clientSocket.GetStream();
postStream.Position = 0;

UploadEventArgs e = new UploadEventArgs();
e.totalBytes = postStream.Length;
System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();//计时器
timer.Start();
do
{
//如果取消就推出
if (isCanceled) { break; }

//读取要发送的数据
count = postStream.Read(buffer, 0, buffer.Length);
//发送到服务器
sm.Write(buffer, 0, count);

//是否显示进度
if (showProgress)
{
//触发事件
e.bytesSent += count;
e.sendProgress = (double)e.bytesSent / (double)e.totalBytes;
double t = timer.ElapsedMilliseconds / 1000;
t = t <= 0 ? 1 : t;
e.sendSpeed = (double)e.bytesSent / t;
if (UploadProgressChanged != null) { UploadProgressChanged(this, e); }
}

} while (count > 0);
timer.Stop();
postStream.Close();
//postStream.Dispose();
postStream = null;

}//end if

}

///<summary>
///向服务器发送请求
///</summary>
///<param name="URL">请求URL地址</param>
///<param name="method">POST或GET</param>
private void SendRequestData(string URL, string method)
{
SendRequestData(URL, method, false);
}


///<summary>
///获取请求头字节数组
///</summary>
///<param name="request">POST或GET请求</param>
///<returns>请求头字节数组</returns>
private byte[] GetRequestHeaders(string request)
{
requestHeaders.Add("Accept", "*/*");
requestHeaders.Add("Accept-Language", "zh-cn");
requestHeaders.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");

string headers = request + "/r/n";

foreach (string key in requestHeaders)
{
headers += key + ":" + requestHeaders[key] + "/r/n";
}

//有Cookie就带上Cookie
if (cookie != "") { headers += "Cookie:" + cookie + "/r/n"; }

//空行，请求头结束
headers += "/r/n";

strRequestHeaders = headers;
requestHeaders.Clear();
return encoding.GetBytes(headers);
}



///<summary>
///获取服务器响应文本
///</summary>
///<returns>服务器响应文本</returns>
private string GetHtml()
{
MemoryStream ms = new MemoryStream();
SaveNetworkStream(ms);//将网络流保存到内存流
StreamReader sr = new StreamReader(ms, encoding);
respHtml = sr.ReadToEnd();
sr.Close(); ms.Close();
return respHtml;
}

///<summary>
///将网络流保存到指定流
///</summary>
///<param name="toStream">保存位置</param>
///<param name="needProgress">是否显示进度</param>
private void SaveNetworkStream(Stream toStream, bool showProgress)
{
//获取要保存的网络流
NetworkStream NetStream = clientSocket.GetStream();

byte[] buffer = new byte[RECEIVE_BUFFER_SIZE];
int count = 0, startIndex = 0;

MemoryStream ms = new MemoryStream();
for (int i = 0; i < 3; i++)
{
count = NetStream.Read(buffer, 0, 500);
ms.Write(buffer, 0, count);
}

if (ms.Length == 0) { NetStream.Close(); throw new Exception("远程服务器没有响应"); }

buffer = ms.GetBuffer();
count = (int)ms.Length;

GetResponseHeader(buffer, out startIndex);//分析响应，获取响应头和响应实体
count -= startIndex;
toStream.Write(buffer, startIndex, count);

DownloadEventArgs e = new DownloadEventArgs();

if (responseHeaders["Content-Length"] != null)
{ e.totalBytes = long.Parse(responseHeaders["Content-Length"]); }
else
{ e.totalBytes = -1; }

//启动计时器
System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();
timer.Start();

do
{
//如果取消就推出
if (isCanceled) { break; }

//显示下载进度
if (showProgress)
{
e.bytesReceived += count;
e.ReceiveProgress = (double)e.bytesReceived / (double)e.totalBytes;

byte[] tempBuffer = new byte[count];
Array.Copy(buffer, startIndex, tempBuffer, 0, count);
e.receivedBuffer = tempBuffer;

double t = (timer.ElapsedMilliseconds + 0.1)/1000;
e.receiveSpeed = (double)e.bytesReceived / t;

startIndex = 0;
if (DownloadProgressChanged != null) { DownloadProgressChanged(this, e); }
}

//读取网路数据到缓冲区
count = NetStream.Read(buffer, 0, buffer.Length);

//将缓存区数据保存到指定流
toStream.Write(buffer, 0, count);
} while (count > 0);

timer.Stop();//关闭计时器

if (responseHeaders["Content-Length"] != null)
{
toStream.SetLength(long.Parse(responseHeaders["Content-Length"]));
}
//else
//{
// toStream.SetLength(toStream.Length);
// responseHeaders.Add("Content-Length", toStream.Length.ToString());//添加响应标头
//}

toStream.Position = 0;

//关闭网络流和网络连接
NetStream.Close();
clientSocket.Close();
}


///<summary>
///将网络流保存到指定流
///</summary>
///<param name="toStream">保存位置</param>
private void SaveNetworkStream(Stream toStream)
{
SaveNetworkStream(toStream, false);
}



///<summary>
///分析响应流，去掉响应头
///</summary>
///<param name="buffer"></param>
private void GetResponseHeader(byte[] buffer, out int startIndex)
{
responseHeaders.Clear();
string html = encoding.GetString(buffer);
StringReader sr = new StringReader(html);

int start = html.IndexOf("/r/n/r/n") + 4;//找到空行位置
strResponseHeaders = html.Substring(0, start);//获取响应头文本

//获取响应状态码
//
if (sr.Peek() > -1)
{
//读第一行字符串
string line = sr.ReadLine();

//分析此行字符串,获取服务器响应状态码
Match M = RE.Match(line, @"/d/d/d");
if (M.Success)
{
statusCode = int.Parse(M.Value);
}
}

//获取响应头
//
while (sr.Peek() > -1)
{
//读一行字符串
string line = sr.ReadLine();

//若非空行
if (line != "")
{
//分析此行字符串，获取响应标头
Match M = RE.Match(line, "([^:]+):(.+)");
if (M.Success)
{
try
{ //添加响应标头到集合
responseHeaders.Add(M.Groups[1].Value.Trim(), M.Groups[2].Value.Trim());
}
catch
{ }


//获取Cookie
if (M.Groups[1].Value == "Set-Cookie")
{
M = RE.Match(M.Groups[2].Value, "[^=]+=[^;]+");
cookie += M.Value.Trim() + ";";
}
}

}
//若是空行，代表响应头结束响应实体开始。（响应头和响应实体间用一空行隔开）
else
{
//如果响应头中没有实体大小标头，尝试读响应实体第一行获取实体大小
if (responseHeaders["Content-Length"] == null && sr.Peek() > -1)
{
//读响应实体第一行
line = sr.ReadLine();

//分析此行看是否包含实体大小
Match M = RE.Match(line, "~[0-9a-fA-F]{1,15}");

if (M.Success)
{
//将16进制的实体大小字符串转换为10进制
int length = int.Parse(M.Value, System.Globalization.NumberStyles.AllowHexSpecifier);
responseHeaders.Add("Content-Length", length.ToString());//添加响应标头
strResponseHeaders += M.Value + "/r/n";
}
}
break;//跳出循环
}//End If
}//End While

sr.Close();

//实体开始索引
startIndex = encoding.GetBytes(strResponseHeaders).Length;
}


///<summary>
///取消上传或下载,要继续开始请调用Start方法
///</summary>
public void Cancel()
{
isCanceled = true;
}

///<summary>
///启动上传或下载，要取消请调用Cancel方法
///</summary>
public void Start()
{
isCanceled = false;
}

//*************************************************************
//以下为属性
//*************************************************************

///<summary>
///获取或设置请求头
///</summary>
public WebHeaderCollection RequestHeaders
{
set { requestHeaders = value; }
get { return requestHeaders; }
}

///<summary>
///获取响应头集合
///</summary>
public WebHeaderCollection ResponseHeaders
{
get { return responseHeaders; }
}

///<summary>
///获取请求头文本
///</summary>
public string StrRequestHeaders
{
get { return strRequestHeaders; }
}

///<summary>
///获取响应头文本
///</summary>
public string StrResponseHeaders
{
get { return strResponseHeaders; }
}

///<summary>
///获取或设置Cookie
///</summary>
public string Cookie
{
set { cookie = value; }
get { return cookie; }
}

///<summary>
///获取或设置编码方式(默认为系统默认编码方式)
///</summary>
public Encoding Encoding
{
set { encoding = value; }
get { return encoding; }
}

///<summary>
///获取服务器响应文本
///</summary>
public string RespHtml
{
get { return respHtml; }
}


///<summary>
///获取服务器响应状态码
///</summary>
public int StatusCode
{
get { return statusCode; }
}
}
}