using System.Net.Sockets;using System.Collections;using System.IO;using System.Net;using System;using System.Web.Mail;public class POP3{ string POPServer; string user; string pwd; NetworkStream ns; StreamReader sr; static int count; //调用Srfile类，写入文件内容和文件名,文件格式：.txt 读邮件信息 // Srfile Filesr = new Srfile(); //对邮件标题 base64 解码 /// <summary> /// base64 解码 /// </summary> /// <param name="code"></param> /// <returns></returns> private string DecodeBase64(string code) //string code_type, { string decode = ""; string st = code+"000";// string strcode = st.Substring(0,(st.Length/4)*4); byte[] bytes = Convert.FromBase64String(strcode); try { decode = System.Text.Encoding.GetEncoding("GB2312").GetString(bytes); } catch { decode = code; } return decode; } //对邮件标题解码 quoted-printable /// <summary> /// quoted-printable 解码 /// </summary> /// <param name="code"></param> /// <returns></returns> private string DecodeQ(string code) { string[] textArray1 = code.Split(new char[] { '=' }); byte[] buf = new byte[textArray1.Length]; try { for (int i =0;i<textArray1.Length;i++) { if (textArray1[i].Trim()!=string.Empty) { byte[] buftest = new byte[2]; buf[i] = (byte) int.Parse(textArray1[i].Substring(0,2),System.Globalization.NumberStyles.HexNumber); } } } catch { return null; } return System.Text.Encoding.Default.GetString(buf); } public POP3(){} #region /// <summary> /// 接收邮件服务器相关信息 /// </summary> /// <param name="server">参数 pop邮件服务器地址 </param> /// <param name="user">参数 登录到pop邮件服务器的用户名 </param> /// <param name="pwd">参数 登录到pop邮件服务器的密码</param> /// <returns>无返回</returns> public POP3(string server, string _user, string _pwd) { POPServer = server; user = _user; pwd = _pwd; } #endregion //登陆服务器 private void Connect() { TcpClient sender = new TcpClient(POPServer,110); Byte[] outbytes; string input; string readuser = string.Empty; string readpwd = string.Empty; try { ns = sender.GetStream(); sr = new StreamReader(ns); sr.ReadLine(); //检查密码 input = "user " + user + "rn"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) ; readuser = sr.ReadLine(); input = "pass " + pwd + "rn"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) ; readpwd = sr.ReadLine(); //Console.WriteLine(sr.ReadLine() ); } catch { System.Windows.Forms.MessageBox.Show("用户名或密码错误"); } } //为了读到数据流中的正确信息，重新建的一个方法（只是在读邮件详细信息是用到《即GetNewMessages（）方法中用到，这样就可以正常显示邮件正文的中英文》） private void Connecttest(TcpClient tcpc) { Byte[] outbytes; string input; string readuser = string.Empty; string readpwd = string.Empty; try { ns = tcpc.GetStream(); sr = new StreamReader(ns); sr.ReadLine(); //Console.WriteLine(sr.ReadLine() ); input = "user " + user + "rn"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) ; readuser = sr.ReadLine(); input = "pass " + pwd + "rn"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length) ; readpwd = sr.ReadLine(); } catch { System.Windows.Forms.MessageBox.Show("用户名或密码错误"); } } //断开与服务器的连接 private void Disconnect() { //"quit" 即表示断开连接 string input = "quit" + "rn"; Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length); //关闭数据流 ns.Close(); } //获得新邮件数目 # region /// <summary> /// 获取邮件数目 /// </summary> /// <returns>返回 int 邮件数目</returns> public int GetNumberOfNewMessages() { Byte[] outbytes; string input; int countmail; try { Connect(); //"stat"向邮件服务器 表示要取邮件数目 input = "stat" + "rn"; //将string input转化为7位的字符，以便可以在网络上传输 outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length); string thisResponse = sr.ReadLine(); if (thisResponse.Substring(0,4) == "-ERR") { return -1; } string[] tmpArray; //将从服务器取到的数据以“”分成字符数组 tmpArray=thisResponse.Split(' '); //断开与服务器的连接 Disconnect(); //取到的表示邮件数目 countmail = Convert.ToInt32(tmpArray[1]); count = countmail; return countmail; } catch { System.Windows.Forms.MessageBox.Show("Could not connect to mail server"); return -1;//表示读邮件时 出错，将接收邮件的线程 阻塞5分钟 } } # endregion //获取邮件 # region /// <summary> /// 获取所有新邮件 /// </summary> /// <returns> 返回 ArrayList</returns> public ArrayList GetNewMessages( ) //public ArrayList GetNewMessages(string subj) { bool blag = false; int newcount = GetNumberOfNewMessages(); ArrayList newmsgs = new ArrayList(); try { TcpClient tcpc = new TcpClient(POPServer,110); Connecttest(tcpc); // newcount = GetNumberOfNewMessages(); for(int n =1; n<newcount+1; n++) { ArrayList msglines = GetRawMessage(tcpc,n); string msgsubj = GetMessageSubject(msglines).Trim(); System.Web.Mail.MailMessage msg = new MailMessage(); //首先判断Substring是什么编码（"=?gb2312?B?"或者"=?gb2312?Q?"），然后转到相应的解码方法，实现解码 //如果是"=?gb2312?B?"，转到DecodeBase64（）进行解码 if (msgsubj.Length>11) { //base64编码 if (msgsubj.Substring(0,11)=="=?gb2312?B?") { blag = true; msgsubj = msgsubj.Substring(11,msgsubj.Length-13); msg.Subject = DecodeBase64(msgsubj); } //如果是"=?gb2312?Q?"编码，先得取到被编码的部分，字符如果没编码就不转到解码方法 if(msgsubj.Length>11) { if (msgsubj.Substring(0,11)=="=?gb2312?Q?") { blag = true; msgsubj = msgsubj.Substring(11,msgsubj.Length-13); string text = msgsubj; string str = string.Empty; string decodeq = string.Empty; while(text.Length>0) { //判断编码部分是否开始 if (text.Substring(0,1)=="=") { decodeq = text.Substring(0,3); text = text.Substring(3,text.Length-3); //当出现编码部分时，则取出连续的编码部分 while (text.Length>0) { if(text.Substring(0,1) == "=") { decodeq +=text.Substring(0,3); text = text.Substring(3,text.Length-3); } else { break; } } //将连续的编码进行解码 str += DecodeQ(decodeq); } //如果该字节没编码，则不用处理 else { str += text.Substring(0,1); text = text.Substring(1,text.Length-1); } } //用空格代替subject中的“0”,以便能取道全部的内容 msg.Subject = str.Replace("0"," "); } } if (blag == false) { msg.Subject = msgsubj.Replace("0"," "); } } else { msg.Subject = msgsubj.Replace("0"," "); } blag = false; //取发邮件者的邮件地址 msg.From = GetMessageFrom(msglines); //取邮件正文 string msgbody = GetMessageBody(msglines); msg.Body = msgbody; newmsgs.Add(msg); //将收到的邮件保存到本地，调用另一个类的保存邮件方法，不使用此功能 // Filesr.Savefile("subject:"+msg.Subject+"rn"+"sender:"+msg.From+"rn"+"context:"+msg.Body,"mail"+n+".txt"); //删除邮件，不使用 // DeleteMessage(n); } //断开与服务器的连接 Disconnect(); return newmsgs; } catch {// System.Windows.Forms.MessageBox.Show("读取邮件出错，请重试"); return newmsgs; } } #endregion //从服务器读邮件信息 private ArrayList GetRawMessage (TcpClient tcpc,int messagenumber) { Byte[] outbytes; string input; string line = ""; input = "retr " + messagenumber.ToString() + "rn"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length); ArrayList msglines = new ArrayList(); StreamReader srtext; srtext = new StreamReader(tcpc.GetStream(),System.Text.Encoding.Default); //每份邮件以英文“.”结束 do { line = srtext.ReadLine(); msglines.Add(line); } while (line != "."); msglines.RemoveAt(msglines.Count-1); return msglines; } //获取邮件标题 private string GetMessageSubject(ArrayList msglines) { IEnumerator msgenum = msglines.GetEnumerator(); while (msgenum.MoveNext() ) { string line = (string)msgenum.Current; if(line.StartsWith("Subject:") ) { return line.Substring(8,line.Length-8); } } return "None"; } //获取邮件的发送人地址 private string GetMessageFrom (ArrayList msglines) { string[] tokens; IEnumerator msgenum = msglines.GetEnumerator(); while (msgenum.MoveNext() ) { string line = (string)msgenum.Current; if(line.StartsWith("From") ) { tokens = line.Split(new Char[] {':'}); return tokens[1].Trim(new Char[] {'<','>',' '}); } } return "None"; } //邮件正文 private string GetMessageBody(ArrayList msglines) { string body = ""; string line = " "; IEnumerator msgenum = msglines.GetEnumerator(); while(line.CompareTo("") != 0) { msgenum.MoveNext(); line = (string)msgenum.Current; } while (msgenum.MoveNext() ) { body = body + (string)msgenum.Current + "rn"; } return body; } //删除第几封邮件 #region /// <summary> ///根据输入的数字，删除相应编号的邮件 /// </summary> /// <param name="messagenumber">参数 删除第几封邮件 </param> /// <returns>返回 bool true成功；false 失败</returns> public bool DeleteMessage(int messagenumber) { Connect(); Byte[] outbytes; string input ; byte[] backmsg = new byte[25]; string msg = string.Empty; try { input = "dele " + messagenumber.ToString() + "rn"; outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray()); ns.Write(outbytes,0,outbytes.Length); ns.Read(backmsg,0,25); msg = System.Text.Encoding.Default.GetString(backmsg,0,backmsg.Length); Disconnect(); if (msg.Substring(0,3)=="+OK") { return true; } return false; } catch(Exception e) { return false; } } #endregion}
