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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;
using System.Net.Cache;

namespace TestHttpPost
{
	public partial class FrmTestHttpPost : Form
	{
		private EncodingInfo[] _Encodings = null;	// 编码集合.
		private Encoding _ResEncoding = null;	// 回应的编码.

		public FrmTestHttpPost()
		{
			InitializeComponent();
		}

		/// <summary>
		/// 根据BodyName创建Encoding对象。
		/// </summary>
		/// <param name="bodyname">与邮件代理正文标记一起使用的当前编码的名称。</param>
		/// <returns>返回Encoding对象。若没有匹配的BodyName，便返回null。</returns>
		public static Encoding Encoding_FromBodyName(string bodyname)
		{
			if (string.IsNullOrEmpty(bodyname)) return null;
			try
			{
				foreach (EncodingInfo ei in Encoding.GetEncodings())
				{
					Encoding e = ei.GetEncoding();
					if (0 == string.Compare(bodyname, e.BodyName, true))
					{
						return e;
					}
				}
			}
			catch
			{
			}
			return null;
		}

		/// <summary>
		/// 输出日志文本.
		/// </summary>
		/// <param name="s">日志文本</param>
		private void OutLog(string s)
		{
			txtLog.AppendText(s   Environment.NewLine);
			txtLog.ScrollToCaret();
		}
		private void OutLog(string format, params object[] args)
		{
			OutLog(string.Format(format, args));
		}

		private void FrmTestHttpPost_Load(object sender, EventArgs e)
		{
			// Http方法
			cboMode.SelectedIndex = 1;	// POST

			// 回应的编码
			cboResEncoding.Items.Clear();
			_Encodings = Encoding.GetEncodings();
			cboResEncoding.DataSource = _Encodings;
			cboResEncoding.DisplayMember = "DisplayName";
			_ResEncoding = Encoding.UTF8;
			cboResEncoding.SelectedIndex = cboResEncoding.FindStringExact(_ResEncoding.EncodingName);

		}

		private void btnGo_Click(object sender, EventArgs e)
		{
			Encoding myEncoding = Encoding.UTF8;
			string sMode = (string)cboMode.SelectedItem;
			string sUrl = txtUrl.Text;
			string sPostData = txtPostData.Text;
			string sContentType = "application/x-www-form-urlencoded";
			HttpWebRequest req;

			// Log Length
			if (txtLog.Lines.Length > 3000) txtLog.Clear();

			// == main ==
			OutLog(string.Format("{2}: {0} {1}", sMode, sUrl, DateTime.Now.ToString("g")));
			try
			{
				// init
				req = HttpWebRequest.Create(sUrl) as HttpWebRequest;
				req.Method = sMode;
				req.Accept = "*/*";
				req.KeepAlive = false;
				req.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
				if (0 == string.Compare("POST", sMode))
				{
					byte[] bufPost = myEncoding.GetBytes(sPostData);
					req.ContentType = sContentType;
					req.ContentLength = bufPost.Length;
					Stream newStream = req.GetRequestStream();
					newStream.Write(bufPost, 0, bufPost.Length);
					newStream.Close();
				}

				// Response
				HttpWebResponse res = req.GetResponse() as HttpWebResponse;
				try
				{
					OutLog("Response.ContentLength:\t{0}", res.ContentLength);
					OutLog("Response.ContentType:\t{0}", res.ContentType);
					OutLog("Response.CharacterSet:\t{0}", res.CharacterSet);
					OutLog("Response.ContentEncoding:\t{0}", res.ContentEncoding);
					OutLog("Response.IsFromCache:\t{0}", res.IsFromCache);
					OutLog("Response.IsMutuallyAuthenticated:\t{0}", res.IsMutuallyAuthenticated);
					OutLog("Response.LastModified:\t{0}", res.LastModified);
					OutLog("Response.Method:\t{0}", res.Method);
					OutLog("Response.ProtocolVersion:\t{0}", res.ProtocolVersion);
					OutLog("Response.ResponseUri:\t{0}", res.ResponseUri);
					OutLog("Response.Server:\t{0}", res.Server);
					OutLog("Response.StatusCode:\t{0}\t# {1}", res.StatusCode, (int)res.StatusCode);
					OutLog("Response.StatusDescription:\t{0}", res.StatusDescription);

					// header
					OutLog(".\t#Header:");	// 头.
					for (int i = 0; i < res.Headers.Count;   i)
					{
						OutLog("[{2}] {0}:\t{1}", res.Headers.Keys[i], res.Headers[i], i);
					}

					// 找到合适的编码
					Encoding encoding = null;
					//encoding = Encoding_FromBodyName(res.CharacterSet);	// 后来发现主体部分的字符集与Response.CharacterSet不同.
					//if (null == encoding) encoding = myEncoding;
					encoding = _ResEncoding;
					System.Diagnostics.Debug.WriteLine(encoding);

					// body
					OutLog(".\t#Body:");	// 主体.
					using (Stream resStream = res.GetResponseStream())
					{
						using (StreamReader resStreamReader = new StreamReader(resStream, encoding))
						{
							OutLog(resStreamReader.ReadToEnd());
						}
					}
					OutLog(".\t#OK.");	// 成功.
				}
				finally
				{
					res.Close();
				}
			}
			catch (Exception ex)
			{
				OutLog(ex.ToString());
			}
			OutLog(string.Empty);



		}

		private void cboResEncoding_SelectedIndexChanged(object sender, EventArgs e)
		{
			EncodingInfo ei = cboResEncoding.SelectedItem as EncodingInfo;
			if (null == ei) return;
			_ResEncoding = ei.GetEncoding();
		}
	}
}