发送邮件代码ASP.NET中常用代码之一

1，使用Asp.net 实现邮件系统
<summary>
 2        /// 功能：实现在Web页面中发送Email
 3        /// </summary>
 4        private void SendMail()
 5        {
 6            MailMessage m = new MailMessage();
 7            
 8            /**////发件人地址
 9            m.From = tbFrom.Text;
10
11            /**////收件人地址
12            m.To = tbTo.Text;
13
14            /**////邮件主题
15            m.Subject = tbSubject.Text;
16
17            /**////邮件内容
18            m.Body = tbBody.Text;
19
20            /**////优先级
21            switch(ddlp.SelectedIndex)
22            {
23                case 0:
24                    m.Priority = MailPriority.High;
25                    break;
26                case 1:
27                    m.Priority = MailPriority.Low;
28                    break;
29                default:
30                    m.Priority = MailPriority.Normal;
31                    break;
32            }
33
34            /**////设置邮件格式
35            if(ddlp.SelectedIndex==0)
36                m.BodyFormat = MailFormat.Text;
37            else
38                m.BodyFormat = MailFormat.Html;
39
40            /**////设置服务器
41            if(tbServer.Text!="")
42            {
43                SmtpMail.SmtpServer = tbServer.Text;
44            }
45
46            /**////以下处理附件 
47            string strFileName = FileSelect.PostedFile.FileName;
48            if(strFileName!="")
49                m.Attachments.Add(new MailAttachment(strFileName));
50
51            /**////发送邮件
52            SmtpMail.Send(m);
53        }

2利用socket接受邮件
/**//// <summary>
 2        /// 接收邮件
 3        /// </summary>
 4        private void SocketPopMail()
 5        {
 6            POP3 pop = new POP3(tbServer.Text,tbUser.Text,tbPass.Text);
 7            int n = pop.GetNumberOfNewMessages();
 8            if(n==-1)
 9            {
10                Response.Write("<script language='javascript'>alert('服务器连接错误！')</script>");
11                return;
12            }
13            ddlNew.Items.Clear();
14            for(int i=1;i<=n;i++)
15                ddlNew.Items.Add("第"+i.ToString()+"封邮件");
16            if(n>0)
17            {
18                MailMessage msg =  pop.GetNewMessages(0);
19                if(msg!=null)
20                    tbBody.Text = msg.Body;
21            }
22        }
pop3类的实现如下：
1/**//// <summary>
  2    /// 接收邮件类
  3    /// </summary>
  4    public class POP3
  5    {
  6        string POPServer;
  7        string user;
  8        string pwd;
  9        NetworkStream ns;
 10        StreamReader sr;
 11
 12        public POP3(){}
 13
 14        public POP3(string server, string _user, string _pwd)
 15        {
 16            POPServer = server;
 17            user = _user;
 18            pwd = _pwd;
 19        }
 20        
 21        /**//// <summary>
 22        /// 连接服务器
 23        /// </summary>
 24        /// <returns></returns>
 25        private bool Connect()
 26        {
 27            TcpClient sender = new TcpClient(POPServer,110);
 28            byte[] outbytes;
 29            string input;
 30
 31            try
 32            {
 33                ns = sender.GetStream();
 34                sr = new StreamReader(ns);
 35
 36                sr.ReadLine();
 37                input = "user " + user + "\r\n";
 38                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
 39                ns.Write(outbytes,0,outbytes.Length) ;
 40                sr.ReadLine();
 41            
 42                input = "pass " + pwd + "\r\n";
 43                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
 44                ns.Write(outbytes,0,outbytes.Length) ;
 45                sr.ReadLine();
 46                return true;  
 47        
 48            }
 49            catch
 50            {
 51                return false;
 52            }
 53        }
 54        
 55        /**//// <summary>
 56        /// 断开与服务器的连接
 57        /// </summary>
 58        private void Disconnect()
 59        {
 60            string input = "quit" + "\r\n";
 61            Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
 62            ns.Write(outbytes,0,outbytes.Length);
 63            ns.Close();
 64        }
 65
 66        public int GetNumberOfNewMessages()
 67        {
 68            byte[] outbytes;
 69            string input;
 70
 71            try
 72            {
 73                Connect();
 74
 75                input = "stat" + "\r\n";
 76                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
 77                ns.Write(outbytes,0,outbytes.Length);
 78                string resp = sr.ReadLine();
 79                string[] tokens = resp.Split(new Char[] {' '});
 80
 81                Disconnect();
 82
 83                return Convert.ToInt32(tokens[1]);
 84            }
 85            catch
 86            {
 87                return -1;
 88            }
 89        }
 90        public ArrayList GetNewMessages(string subj)
 91        {
 92
 93            int newcount;
 94            ArrayList newmsgs = new ArrayList();
 95
 96            try
 97            {
 98                newcount = GetNumberOfNewMessages();
 99                Connect();
100
101                for(int n=1; n<newcount+1; n++)
102                {
103                    ArrayList msglines = GetRawMessage(n);
104                    string msgsubj = GetMessageSubject(msglines);
105                    if(msgsubj.CompareTo(subj) == 0)
106                    {
107                        System.Web.Mail.MailMessage msg = new MailMessage();
108                        msg.Subject = msgsubj;
109                        msg.From = GetMessageFrom(msglines);
110                        msg.Body = GetMessageBody(msglines);
111                        newmsgs.Add(msg);
112                        DeleteMessage(n);
113                    }
114                }
115
116                Disconnect();
117                return newmsgs;
118            }
119            catch(Exception e)
120            {
121                return newmsgs;
122            }
123        }
124
125        /**//// <summary>
126        /// 获取新邮件
127        /// </summary>
128        /// <param name="nIndex"></param>
129        /// <returns></returns>
130        public MailMessage GetNewMessages(int nIndex)
131        {
132            int newcount;
133            System.Web.Mail.MailMessage msg = new MailMessage();
134
135            try
136            {
137                newcount = GetNumberOfNewMessages();
138                Connect();
139                int n = nIndex+1;
140
141                if(n<newcount+1)
142                {
143                    ArrayList msglines = GetRawMessage(n);
144                    string msgsubj = GetMessageSubject(msglines);
145                
146                    
147                    msg.Subject = msgsubj;
148                    msg.From = GetMessageFrom(msglines);
149                    msg.Body = GetMessageBody(msglines);
150                }
151
152                Disconnect();
153                return msg;
154            }
155            catch
156            {
157                return null;
158            }
159        }
160        private ArrayList GetRawMessage (int messagenumber)
161        {
162            Byte[] outbytes;
163            string input;
164            string line = "";
165
166            input = "retr " + messagenumber.ToString() + "\r\n";
167            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
168            ns.Write(outbytes,0,outbytes.Length);
169
170            ArrayList msglines = new ArrayList();
171            do
172            {
173                line = sr.ReadLine();
174                msglines.Add(line);
175            } while (line != ".");
176            msglines.RemoveAt(msglines.Count-1);
177
178            return msglines;
179        }
180
181        /**//// <summary>
182        /// 获取邮件主题
183        /// </summary>
184        /// <param name="msglines"></param>
185        /// <returns></returns>
186        private string GetMessageSubject(ArrayList msglines)
187        {
188            string[] tokens;
189            IEnumerator msgenum = msglines.GetEnumerator();
190            while (msgenum.MoveNext() )
191            {
192                string line = (string)msgenum.Current;
193                if(line.StartsWith("Subject:") )
194                {
195                    tokens = line.Split(new Char[] {' '});
196                    return tokens[1].Trim();
197                }
198            }
199            return "None";
200        }
201
202        /**//// <summary>
203        /// 获取邮件源地址
204        /// </summary>
205        /// <param name="msglines"></param>
206        /// <returns></returns>
207        private string GetMessageFrom (ArrayList msglines)
208        {
209            string[] tokens;
210            IEnumerator msgenum = msglines.GetEnumerator();
211            while (msgenum.MoveNext() )
212            {
213                string line = (string)msgenum.Current;
214                if(line.StartsWith("From:") )
215                {
216                    tokens = line.Split(new Char[] {'<'});
217                    return tokens[1].Trim(new Char[] {'<','>'});
218                }
219            }
220            return "None";
221        }
222
223        /**//// <summary>
224        /// 获取邮件内容
225        /// </summary>
226        /// <param name="msglines"></param>
227        /// <returns></returns>
228        private string GetMessageBody(ArrayList msglines)
229        {
230            string body = "";
231            string line = " ";
232            IEnumerator msgenum = msglines.GetEnumerator();
233
234            while(line.CompareTo("") != 0)
235            {
236                msgenum.MoveNext();
237                line = (string)msgenum.Current;
238            }
239
240            while (msgenum.MoveNext() )
241            {
242                body = body + (string)msgenum.Current + "\r\n";
243            }
244            return body;
245        }
246
247        /**//// <summary>
248        /// 删除邮件
249        /// </summary>
250        /// <param name="messagenumber"></param>
251        private void DeleteMessage(int messagenumber)
252        {
253            Byte[] outbytes;
254            string input;
255
256            try
257            {
258                input = "dele " + messagenumber.ToString() + "\r\n";
259                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
260                ns.Write(outbytes,0,outbytes.Length);
261            }
262            catch(Exception e)
263            {
264                return;
265            }
266
267        }
268
269    }
3利用socket发送邮件
/**//// <summary>
 2        /// 功能：利用Socket来发送邮件
 3        /// </summary>
 4        private void SocketSendMail()
 5        {
 6            SMTP smtp = new SMTP();
 7            bool bSuccess = smtp.Send(tbSmtp.Text,25,tbSend.Text,tbReceive.Text,tbSubject.Text,tbBody.Text);
 8            if(bSuccess)
 9                Response.Write("<script language='javascript'>alert('邮件发送成功！')</script>");
10            else
11                Response.Write("<script language='javascript'>alert('邮件发送失败！')</script>");
12        }
smtp类的实现如下：
1/**//// <summary>
 2    /// 发送邮件类
 3    /// </summary>
 4    public class SMTP
 5    {
 6        public SMTP(){}
 7
 8        public bool Send(string strSmtpServer,int nPort,string strSend,string strReceive
 9            ,string strSubject,string strContent)
10        {
11            /**//// smtp服务器的IP地址　　
12            string smtpserver=strSmtpServer;
13            TcpClient tcpc = new TcpClient();
14            try
15            {
16                tcpc.Connect(smtpserver, nPort);
17                StreamReader sr ;
18                string strCmd;
19                sr = new StreamReader(tcpc.GetStream(),Encoding.Default);
20
21                /**////服务器连接成功以后，首先向服务器发送HeLlo命令
22                strCmd="HELO shaozhd";
23                SenSmtpCmd(tcpc,strCmd);
24
25                /**////然后向服务器发送信件的成员的信箱
26                strCmd="mail from:"+ strSend;
27                SenSmtpCmd(tcpc,strCmd);
28
29                /**////向服务器发送收件人的信箱
30                strCmd="rcpt to:" + strReceive;
31                SenSmtpCmd(tcpc,strCmd);
32
33                /**////所有的准备工作都已经作好了,下面开始进行邮件的部分
34                strCmd="data";
35                SenSmtpCmd(tcpc,strCmd);
36
37                /**////邮件内容
38                strCmd="Date: 1234567\r\n";
39                strCmd=strCmd+"From: " + strSend +"\r\n";
40                strCmd=strCmd+"To: " + strReceive +"\r\n";
41                strCmd=strCmd+"Subject: " + strSubject +"\r\n\r\n";
42                strCmd=strCmd + strContent +"\r\n\r\n";
43                SenSmtpCmd(tcpc,strCmd);
44                strCmd="\r\n.\r\n";
45                SenSmtpCmd(tcpc,strCmd);
46
47                /**////最后 关闭与smtp 服务器的连接
48　　　　　　        tcpc.Close();
49                return true;
50　            }
51            catch
52            {
53                return false;
54            }
55        }
56
57        /**//// <summary>
58        /// 发送SMTP命令
59        /// </summary>
60        /// <param name="tcpc"></param>
61        /// <param name="strCmd"></param>
62        void SenSmtpCmd(TcpClient tcpc,String strCmd)
63        {
64
65　　　    　　byte[] arrCmd;
66        　　string strRet;
67        　　StreamReader sr;
68    　　　　Stream s;
69    　　　　s=tcpc.GetStream();
70    　　　　strCmd = strCmd + "\r\n";
71    　　　　arrCmd= Encoding.Default.GetBytes(strCmd.ToCharArray()); 
72    　　　　s=tcpc.GetStream();
73    　　　　s.Write(arrCmd, 0, strCmd.Length);
74
75            /**////以下用于程序调试，显示服务器回应信息
76    　　　　sr = new StreamReader(tcpc.GetStream(), Encoding.Default);
77    　　　　strRet=sr.ReadLine();
78    　　　　return;
79        }
80    }
转自http://Teerylee.cnblogs.com/