怎么在qq邮箱接收example邮件（C接收邮件之QQ邮箱）

前面写了一篇通过smtp协议利用qq邮箱去实现发送邮件的功能。这一篇我们使用pop协议来实现一下接收邮件。

由于邮件的内容类型比较丰富，我暂时没有一个比较好的解决方案（确切地说我是懒得一种种去解析），所以这里就获取下邮件的列表，以及邮件的标题信息

实现功能：

• C#获取QQ邮箱内的邮件

开发环境：

开发工具： Visual Studio 2013

.NET Framework版本：4.5

实现代码：

static class Program { static string mail = "", pwd = ""; static void Main(string[] args) { Connect(); Console.WriteLine("结束运行"); Console.ReadKey(); } static void Connect() { TcpClient tcpClient = new TcpClient("pop.qq.com", 995); Console.WriteLine("已建立连接"); sslStream sslStream = new SslStream(tcpClient.GetStream(), true); sslStream.AuthenticateAsClient("pop.qq.com"); //发送邮箱账号 sslStream.SendPop("user " mail); Console.WriteLine(sslStream.ReadString().msg); //发送邮箱密码 sslStream.SendPop("pass " pwd); Console.WriteLine(sslStream.ReadString().msg); //获取邮箱统计数据 sslStream.SendPop("stat"); Console.WriteLine(sslStream.ReadString().msg); //获取邮件数量和每个邮件的大小 sslStream.SendPop("list"); string listMsg = sslStream.ReadString().msg; List<string> list = listMsg.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).ToList(); if (list.Count < 2) { Console.WriteLine("未获取到邮件"); return; } list.RemoveAt(0); list.RemoveAt(list.Count - 1); for (int i = list.Count - 1; i > -1; i--) { string[] arr = list[i].Split(' '); //获取邮件前n行内容 sslStream.SendPop("top " arr[0] " 1"); Console.WriteLine(list[i]); Console.WriteLine(GetHeader(sslStream.ReadString().msg)); Console.WriteLine(); Console.WriteLine(); } //string id = Console.ReadLine(); //sslStream.SendPop("retr " id); //Console.WriteLine(GetContext(sslStream.ReadString().msg)); sslStream.Close(); tcpClient.Close(); } /// <summary> /// 解析邮件标题 /// </summary> /// <param name="text"></param> /// <returns></returns> static string GetHeader(string text) { List<string> list = text.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).ToList(); list.RemoveAt(0); list.RemoveAt(list.Count - 1); StringBuilder sb = new StringBuilder(); for (int i = 1; i < list.Count; i ) { if (list[i].StartsWith("Date: ")) { sb.AppendLine("发送时间：" list[i].Substring("Date: ".Length)); } if (list[i].StartsWith("From: ")) { string value = list[i].Substring("From: ".Length); sb.AppendLine("发送人：" GetText(value)); } if (list[i].StartsWith("Subject: ")) { string value = list[i].Substring("Subject: ".Length); sb.AppendLine("邮件标题：" GetText(value)); } if (list[i].StartsWith("Cc: ")) { string value = list[i].Substring("Cc: ".Length); sb.AppendLine("抄送：" GetText(value)); } } return sb.ToString(); } /// <summary> /// 解析邮件内容 /// </summary> /// <param name="text"></param> /// <returns></returns> static string GetContext(string text) { List<string> list = text.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).ToList(); list.RemoveAt(0); list.RemoveAt(list.Count - 1); StringBuilder sb = new StringBuilder(); string s = list.Where(a => a.StartsWith("Content-Transfer-Encoding:")).SingleOrDefault(); int index = list.IndexOf(s) 1; for (int i = index; i < list.Count - index; i ) { sb.AppendLine(GetText(list[i])); } return sb.ToString(); } /// <summary> /// 解析原始文本 /// </summary> /// <param name="value"></param> /// <returns></returns> static string GetText(string value) { string encoding = "utf-8"; if (value.IndexOf("=?") == 0) { string tag = ""; if (value.Contains("?B?")) { tag = "?B?"; encoding = value.SubStr("=?", tag); } if (value.Contains("?b?")) { tag = "?b?"; encoding = value.SubStr("=?", tag); } if (value.Contains("?Q?")) { tag = "?Q?"; encoding = value.SubStr("=?", tag); } if (tag != "") { string last = ""; int lastIndex = value.LastIndexOf("?="); if (lastIndex != value.TrimEnd().Length - 2) { last = value.Substring(lastIndex 2); } string text = value.SubStr(tag, "?="); if (tag.ToLower().Contains("b")) { return Encoding.GetEncoding(encoding).GetString(Convert.FromBase64String(text)) last; } else if (tag.ToLower().Contains("q")) { return DecodeQP(text, encoding) last; } } } return value; } static string SubStr(this string text, string start, string end) { try { int s = text.IndexOf(start); int e = text.LastIndexOf(end); if (s == -1 || e == -1) { return text; } string result = text.Substring(s start.Length, e - s - start.Length); return result; } catch (Exception ex) { throw ex; } } /// <summary> /// 发送数据到pop /// </summary> /// <param name="sslStream"></param> /// <param name="text"></param> /// <param name="isNewLine"></param> static void SendPop(this SslStream sslStream, string text, bool isNewLine = true) { if (isNewLine) { text = "\r\n"; } sslStream.Write(Encoding.ASCII.Getbytes(text)); } static dynamic ReadString(this SslStream sslStream) { try { byte[] buffer = new byte[2048 * 2048]; int len = sslStream.Read(buffer, 0, buffer.Length); string result = Encoding.UTF8.GetString(buffer, 0, len); if (result.StartsWith("-ERR")) { throw new Exception(result); } else { return new { code = 1, msg = result }; } } catch (Exception ex) { return new { code = 0, msg = "读取错误:" ex.Message }; } } //Quoted-Printable 解码(QP解码) static string DecodeQP(string data, string encoding) { char ch; string ret = ""; byte[] bytes = new byte[data.Length]; int bIdex = 0; try { for (int rIndex = 0; rIndex < data.Length; rIndex ) { ch = data[rIndex]; if (ch == '=') { rIndex ; if (rIndex < data.Length && (Char.IsDigit(data[rIndex]) || Char.IsLetter(data[rIndex]))) { bytes[bIdex ] = Byte.Parse(data.Substring(rIndex , 2), System.Globalization.NumberStyles.HexNumber); continue; } if (rIndex < data.Length && data[rIndex] == '\r' && (rIndex 1) < data.Length && data[rIndex 1] == '\n') { rIndex ; continue; } } if (ch == '\r' || ch == '\n') continue; bytes[bIdex ] = (byte)ch; } ret = Encoding.GetEncoding(encoding).GetString(bytes, 0, bIdex); } catch (Exception ex) { Console.WriteLine(ex.Message); } return ret; } }

由简入繁，拿来即用

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