創建用於asp.net的smtp郵件服務
Asp.net在System.Web.Mail命名空間中有一個發送email的內建類,這僅是cdosys的一個包裝。開發者可能希望使用一個替代的它smtp郵件服務。在這篇文章裡面,我將會展示如何創建一個用於asp.net的功能齊全的smtp郵件服務。(僅僅是70行的c#語句) 首選,我們創建一個繼承命名空間System.Net.Sockets的TcpClient類的類。TcpClient類提供簡單的方法用於連接,發送,接收網絡的數據流。GetStream方法用於創建一個網絡流(NetworkStream)。讀和寫網絡流(NetworkStream)的方法用於發送數據給遠程主機和從遠程主機接收網絡流。
public class ClientConnection : TcpClient { private NetworkStream _NetworkStream = null; private StreamReader _StreamReader = null; private StreamWriter _StreamWriter = null; public void Initialise() { _NetworkStream = this.GetStream(); _StreamReader = new StreamReader(_NetworkStream, System.Text.Encoding.Default, false, this.ReceiveBufferSize); _StreamWriter = new StreamWriter(_NetworkStream, System.Text.Encoding.Default, this.SendBufferSize); } public void Send(string s) { _StreamWriter.WriteLine(s); _StreamWriter.Flush(); } public string Read() { return _StreamReader.ReadLine(); } }
接下來,我們創建發送郵件出去的類,這個類有幾個屬性去設置關於被發送的郵件的一些信息。
public string MailServer = "127.0.0.1" ; public string From = "" ; public string To = "" ; public string Body = "" ; public string Subject = "" ;
和一個發送郵件的方法。這個方法將會用服務器名和它的端口去創建一個連接。指令可以被發送到遠程主機。
public void Send() { tcp = new ClientConnection(); tcp.Connect(MailServer,25); tcp.Initialise(); SendCommandToServer("HELO " + System.Net.Dns.GetHostName()); SendCommandToServer("MAIL FROM: " + From + "\r\n"); SendCommandToServer("RCPT TO: " + To + "\r\n"); string StrHeaders = ""; StrHeaders += "From: " + From + "\r\n"; StrHeaders += "To: " + To + "\r\n"; StrHeaders += "Subject: " + Subject + "\r\n"; StrHeaders += "Content-type: text/plain; charset=\"ISO-8859-1\"" + "\r\n"; SendCommandToServer("DATA\r\n" + StrHeaders); SendCommandToServer(Body + "\r\n.\r\n"); SendCommandToServer("QUIT\r\n"); }
還有一個私有的送一個指令到本地服務器的方法。
private void SendCommandToServer(string cmd) { tcp.Send(cmd); Response=tcp.Read(); System.Web.HttpContext.Current.Trace.Warn("Response",Response); } 現在,這個類基本完成了。開發者還可以建立錯誤回執和釋放資源(用TcpClient類中的Close()方法)。同樣,這幾個屬性可以被擴展到在郵件中包含更多的信息。
最後,我們可以在aspx文件中寫一些發送郵件的代碼。在這個例子中,“localhost”是郵件服務器。你可以根據情況改變這個,或者可以看我的關於如何設置你的發送郵件的本地服務器的文章。
<%@ Import Namespace="MyComponents" %> <script runat="server"> protected void Page_Load(Object Src, EventArgs E) { if (IsPostBack) { Mail Mailer=new Mail(); Mailer.From=From.Text; Mailer.To=To.Text; Mailer.Subject=Subject.Text; Mailer.Body=Body.Text; Mailer.MailServer="localhost"; Mailer.Send(); } } </script>
下面是完整的代碼。你可以從文章底部的連接中下載這個代碼。
using System.IO; using System.Net.Sockets; namespace MyComponents { public class ClientConnection : TcpClient { private NetworkStream _NetworkStream = null; private StreamReader _StreamReader = null; private StreamWriter _StreamWriter = null; public void Initialise() { _NetworkStream = this.GetStream(); _StreamReader = new StreamReader(_NetworkStream, System.Text.Encoding.Default, false, this.ReceiveBufferSize); _StreamWriter = new StreamWriter(_NetworkStream, System.Text.Encoding.Default, this.SendBufferSize); } public void Send(string s) { _StreamWriter.WriteLine(s); _StreamWriter.Flush(); } public string Read() { return _StreamReader.ReadLine(); } } public class Mail { public string MailServer = "127.0.0.1" ; public string From = "" ; public string To = "" ; public string Body = "" ; public string Subject = "" ; private ClientConnection tcp=null; private string Response=""; public void Send() { tcp = new ClientConnection(); tcp.Connect(MailServer,25); tcp.Initialise(); SendCommandToServer("HELO " + System.Net.Dns.GetHostName()); SendCommandToServer("MAIL FROM: " + From + "\r\n"); SendCommandToServer("RCPT TO: " + To + "\r\n"); string StrHeaders = ""; StrHeaders += "From: " + From + "\r\n"; StrHeaders += "To: " + To + "\r\n"; StrHeaders += "Subject: " + Subject + "\r\n"; StrHeaders += "Content-type: text/plain; charset=\"ISO-8859-1\"" + "\r\n"; SendCommandToServer("DATA\r\n" + StrHeaders); SendCommandToServer(Body + "\r\n.\r\n"); SendCommandToServer("QUIT\r\n"); } private void SendCommandToServer(string cmd) { tcp.Send(cmd); Response=tcp.Read(); System.Web.HttpContext.Current.Trace.Warn("Response",Response); } } }
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