C# Http网络访问类

using System;using System.Collections.Generic;using System.IO;using System.Net;using System.Text;namespace HttpClient{/// <summary>/// 通过Http协议访问Web/// </summary>public class HttpClient{#region Cookie集合/// <summary>/// Cookie集合/// </summary>private CookieContainer cookies;#endregion#region Http user-agent标头值/// <summary>/// Http user-agent标头值/// </summary>public string UserAgent { get; set; }#endregion#region HttpClient构造函数public HttpClient(){this.cookies = new CookieContainer();}#endregion#region 获取HttpClient的Cookie集合/// <summary>/// 获取HttpClient的Cookie集合/// </summary>/// <returns></returns>public CookieContainer GetCookieContainer(){return this.cookies;}#endregion#region 设置HttpClient的Cookie集合/// <summary>/// 设置HttpClient的Cookie集合/// </summary>/// <param name="_cookie">Cookie集合对象</param>/// <returns>True设置成功 False设置失败</returns>public bool SetCookieContainer(CookieContainer _cookie){if (_cookie != null){this.cookies = _cookie;return true;}return false;}#endregion#region 以GET方式打开一个Http连接/// <summary>/// 以GET方式打开一个Http连接/// </summary>/// <param name="url">地址</param>/// <param name="headers">请求头</param>/// <returns></returns>public ResultResponse OpenGetUrl(string url, Dictionary<string, string> headers){HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;request.CookieContainer = this.cookies;request.Method = HttpClient.ConnectionType.GET;request.KeepAlive = true;if (this.UserAgent != null && this.UserAgent != ""){request.UserAgent = this.UserAgent;}this.FillHeaders(request, headers);HttpWebResponse response = request.GetResponse() as HttpWebResponse;return new ResultResponse(response);}#endregion#region 以GET方式打开一个Http连接,302自定义处理行为/// <summary>/// 以GET方式打开一个Http连接,302自定义处理行为/// </summary>/// <param name="url">地址</param>/// <param name="headers">请求头</param>/// <param name="action">302跳转处理</param>/// <returns></returns>public ResultResponse OpenGetUrlRedirect(string url, Dictionary<string, string> headers,HttpClient.RedirectAction action){HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;request.CookieContainer = this.cookies;request.Method = HttpClient.ConnectionType.GET;request.KeepAlive = true;request.AllowAutoRedirect = false; //302不采用默认行为处理if (this.UserAgent != null && this.UserAgent != ""){request.UserAgent = this.UserAgent;}this.FillHeaders(request, headers);HttpWebResponse response = request.GetResponse() as HttpWebResponse;ResultResponse result=new ResultResponse(response);if (response.StatusCode == HttpStatusCode.Found){bool ret = true;if (action != null){ret = action(result);}string locationurl = response.Headers["Location"];if (ret == true){return this.OpenGetUrlRedirect(locationurl, null, action);}return result;}return result;}#endregion#region Http 302跳转处理/// <summary>/// Http 302跳转处理/// </summary>/// <param name="result">响应对象</param>/// <returns>False 不继续跳转 True继续跳转</returns>public delegate bool RedirectAction(ResultResponse result);#endregion#region 将Http标头值添加到Request对象中/// <summary>/// 将Http标头值添加到Request对象中/// </summary>/// <param name="headers"></param>private void FillHeaders(HttpWebRequest request,Dictionary<string, string> headers){if (headers != null && headers.Count > 0){Dictionary<string, string>.Enumerator em = headers.GetEnumerator();while (em.MoveNext()){request.Headers.Add(em.Current.Key, em.Current.Value);}}}#endregion#region 以POST方式打开一个Http连接/// <summary>/// 以POST方式打开一个Http连接/// </summary>/// <param name="url">地址</param>/// <param name="headers">请求头</param>/// <param name="data">发送的数据</param>/// <returns></returns>public ResultResponse OpenPostUrl(string url,Dictionary<string,string> headers,Dictionary<string,string> data){HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;request.CookieContainer = this.cookies;request.Method = HttpClient.ConnectionType.POST;request.KeepAlive = true;if (this.UserAgent != null && this.UserAgent != ""){request.UserAgent = this.UserAgent;}this.FillHeaders(request, headers);byte[] buff = DictToBytes(data);request.GetRequestStream().Write(buff, 0, buff.Length);request.GetRequestStream().Close();HttpWebResponse response = request.GetResponse() as HttpWebResponse;return new ResultResponse(response);}#endregion#region 以POST方式打开一个Http连接,302自定义处理行为/// <summary>/// 以POST方式打开一个Http连接,302自定义处理行为/// </summary>/// <param name="url">地址</param>/// <param name="headers">请求头</param>/// <param name="data">发送的数据</param>/// <param name="action">302自定义处理</param>/// <returns></returns>public ResultResponse OpenPostUrlRedirect(string url, Dictionary<string, string> headers, Dictionary<string, string> data,HttpClient.RedirectAction action){HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;request.CookieContainer = this.cookies;request.Method = HttpClient.ConnectionType.POST;request.KeepAlive = true;request.AllowAutoRedirect = false;if (this.UserAgent != null && this.UserAgent != ""){request.UserAgent = this.UserAgent;}this.FillHeaders(request, headers);byte[] buff = DictToBytes(data);request.GetRequestStream().Write(buff, 0, buff.Length);request.GetRequestStream().Close();HttpWebResponse response = request.GetResponse() as HttpWebResponse;ResultResponse result = new ResultResponse(response);if (response.StatusCode == HttpStatusCode.Found){bool ret = true;if (action != null){ret = action(result);}string locationurl = response.Headers["Location"];return result;}return result;}#endregion#region 将字典的key和value拼接成http参数/// <summary>/// 将字典的key和value拼接成http参数/// </summary>/// <param name="dic">参数</param>/// <returns></returns>private byte[] DictToBytes(Dictionary<string, string> dic){StringBuilder sb = null;if (dic != null){Dictionary<string,string>.Enumerator em= dic.GetEnumerator();sb = new StringBuilder();while (em.MoveNext()){sb.Append(String.Format("{0}={1}&", em.Current.Key, em.Current.Value));}return System.Text.Encoding.UTF8.GetBytes(sb.ToString());}return null;}#endregion#region HttpClient打开连接的方式/// <summary>/// HttpClient打开连接的方式/// </summary>public static class ConnectionType{public static string GET { get { return "GET"; } }public static string POST { get { return "POST"; } }}#endregion}}

<pre name="code" class="csharp">using System;using System.Collections.Generic;using System.IO;using System.Net;using System.Text;namespace HttpClient{/// <summary>///包含服务器响应数据的对象/// </summary>public class ResultResponse{#region HttpWebResponse对象/// <summary>/// HttpWebResponse对象/// </summary>private HttpWebResponse m_response;#endregion#region 创建一个HttpWebResponse对象/// <summary>/// 创建一个HttpWebResponse对象/// </summary>/// <param name="_response">HttpWebResponse</param>public ResultResponse(HttpWebResponse _response){this.m_response = _response;}#endregion#region 获取响应内容的二进制流/// <summary>/// 获取响应内容的二进制流/// </summary>/// <returns></returns>public Stream GetResponseStream(){if (this.m_response != null){return this.m_response.GetResponseStream();}return null;}#endregion#region Http版本/// <summary>/// Http版本/// </summary>public string ProtocolVersion { get { return this.m_response != null ? this.m_response.ProtocolVersion.ToString() : ""; } }#endregion/// <summary>/// 响应方法/// </summary>public string Method { get { return this.m_response != null ? this.m_response.Method : ""; } }/// <summary>/// Http状态码/// </summary>public string StatusCode { get { return this.m_response != null ? this.m_response.StatusCode.ToString() : ""; } }/// <summary>/// Http响应头/// </summary>public WebHeaderCollection Headers { get { return this.m_response != null ? this.m_response.Headers : null;} }/// <summary>/// 响应流的字符编码/// </summary>/// <returns></returns>public Encoding getResponseEncoding(){if (this.m_response != null){return Encoding.GetEncoding(this.m_response.ContentEncoding);}return null;}/// <summary>/// 获取响应内容的字符串/// </summary>/// <param name="encoding">字符串编码(默认utf8)</param>/// <returns></returns>public string GetContent(string encoding="utf-8"){return System.Text.Encoding.GetEncoding(encoding).GetString(this.StreamtoBytes(this.GetResponseStream()));}/// <summary>/// 获取原始的HttpWebResponse/// </summary>/// <returns></returns>public HttpWebResponse GetRawResponse(){return this.m_response;}/// <summary>/// 二进制流转换成字节数组/// </summary>/// <param name="_stream"></param>/// <returns></returns>private byte[] StreamtoBytes(Stream _stream){byte[] buff;int rlen;MemoryStream _ms;if (_stream != null){buff = new byte[1024];rlen = 0;_ms = new MemoryStream();while ((rlen = _stream.Read(buff, 0, 1024)) > 0){_ms.Write(buff, 0, rlen);}buff = _ms.ToArray();_ms.Close();_ms.Dispose();return buff;}return null;}}}