SMTP Service（Simple Mail Transport Protocol简单邮件传输协议）是Microsoft Windows 2000的组件，它能执行发送和获取电子邮件的基本工作,但不支持多个邮箱。此服务使用两个主要目录处理电子邮件，它们是Pickup和Drop，这两个目录位于InetPub\MailRoot目录下。服务不断地检查Pickup目录，当找到电子邮件消息时，就尝试发送这个电子邮件。若服务无法立即投递这个消息，就将它保存于Queue目录中，同时服务继续尝试投递消息。如果电子邮件消息无法投递，而且返回给发送者，消息就转移到Badmail目录。 在.NET中可以通过SmtpMail类进行发送电子邮件消息.在进行程序调试前应确保SMTP服务正常运行，并且系统装有Microsoft .NET Framework以便编译ASPX文件，如果发现不能正常编译，记住要检查相应的服务是否已启动。下面以例子来描述SMTP的般用法。本人使用的编程环境是:一机作邮件服务器,运行Exchange Server2003,另一机运行Windows 2000 Server作开发端.例子中进行了三种常用的邮件内容:文本,附件,HTML文本.同时也进行了提取信息的方法演示,具体代码如下:
<%@ page validateRequest=false %> <%@ Import Namespace="System.Web.Mail"%> <%@ Import Namespace="System.IO" %> <%@ Import Namespace="System.Data.SqlClient" %> <script runat="server"> sub Page_Load if not IsPostBack then dim conn as Sqlconnection dim cmd as SqlCommand dim dtrMailto as SqlDataReader conn = new SqlConnection("server=localhost;UID=sa;PWD=sa;DataBase=MailTest") conn.open() cmd = new SqlCommand("select email from MailTable",conn) dtrMailto = cmd.ExecuteReader() mailtoList.DataSource = dtrMailto mailtoList.DataTextField ="email" mailtoList.DataBind() dtrMailto.close() conn.close() end if end sub
sub Button_click(s as Object,e as EventArgs) SmtpMail.Send(mailfrom.text,mailto.text,txtSubject.text,txtBody.text) end sub
sub Button_Attachment_click(s as Object,e as EventArgs) dim objMailMessage as MailMessage dim objMailAttachment as MailAttachment objMailAttachment = new MailAttachment(filename.PostedFile.FileName) objMailMessage = new MailMessage objMailMessage.From = mailfrom.text objMailMessage.To = mailto.text objMailMessage.Subject=txtSubject.text objMailMessage.Body=txtBody.text objMailMessage.Attachments.add(objMailAttachment) SmtpMail.send(objMailMessage) end sub
sub Button_html_click(s as Object,e as EventArgs) dim objMailMessage as MailMessage dim strContent as String strContent = txtHtmlBody.text objMailMessage = new MailMessage objMailMessage.From = mailfrom.text objMailMessage.To = mailto.text objMailMessage.Subject=txtSubject.text objMailMessage.Body=strContent objMailMessage.BodyFormat = MailFormat.HTML SmtpMail.send(objMailMessage) end sub
sub Button_DB_click(s as Object,e as EventArgs) dim objMailMessage as MailMessage objMailMessage = new MailMessage objMailMessage.From = mailfrom.text objMailMessage.To = mailtoList.SelectedItem.text objMailMessage.Subject=txtSubject.text objMailMessage.Body=txtBody.text SmtpMail.send(objMailMessage) end sub
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