c# 实现pop3收邮件
using System.Net.Sockets;
using System.Collections;
using System.IO;
using System.Net;
using System;
using System.Web.Mail;
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);
/// <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);
}
}
}
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) ;
/// <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);
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() );
//Console.WriteLine(sr.ReadLine() );
input = "user " + user + "rn";
outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
ns.Write(outbytes,0,outbytes.Length) ;
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;
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;
{
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>
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();
{
bool blag = false;
int newcount = GetNumberOfNewMessages();
ArrayList newmsgs = new ArrayList();
try
{
TcpClient tcpc = new TcpClient(POPServer,110);
Connecttest(tcpc);
// newcount = GetNumberOfNewMessages();
{
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;
//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)
{
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);
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"," ");
}
//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);
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);
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";
}
}
//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();
private string GetMessageBody(ArrayList msglines)
{
string body = "";
string line = " ";
IEnumerator msgenum = msglines.GetEnumerator();
while(line.CompareTo("") != 0)
{
msgenum.MoveNext();
line = (string)msgenum.Current;
}
{
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;
}
{
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
#endregion
}
