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（确切的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;
}
} 