发送电子邮件也是项目开发当中经常用到的功能,这里我整理了一个发送电子邮件(带附件,支持多用户发送,主送、抄送)的类库,供大家参考。
先上两个实体类,用于封装成Mail对象。
/// <summary> /// 发送邮件请求 /// </summary> public class MailRequest { #region PrivateFields /// <summary> /// 文件名 /// </summary> private string _fromField; /// <summary> /// 返送到 /// </summary> private string _toField; /// <summary> /// 抄送 /// </summary> private string _copyField; /// <summary> /// 附件 /// </summary> private string _bccField; /// <summary> /// 标题 /// </summary> private string _subjectField; /// <summary> /// 发送人名 /// </summary> private string _bodyField; /// <summary> /// 类容 /// </summary> private MailRequestAttachments[] _p_w_uploadsField; #endregion /// <summary> /// 发送人,多个人以分号;间隔 /// </summary> public string From { get { return this._fromField; } set { this._fromField = value; } } /// <summary> /// 收件人,多个人以分号;间隔 /// </summary> public string To { get { return this._toField; } set { this._toField = value; } } /// <summary> /// 抄送人,多个人以分号;间隔 /// </summary> public string CC { get { return this._copyField; } set { this._copyField = value; } } /// <summary> /// 秘密抄送人,多个人以分号;间隔 /// </summary> public string Bcc { get { return this._bccField; } set { this._bccField = value; } } /// <summary> /// 主题 /// </summary> public string Subject { get { return this._subjectField; } set { this._subjectField = value; } } /// <summary> /// 内容 /// </summary> public string Body { get { return this._bodyField; } set { this._bodyField = value; } } /// <summary> /// 附件列表 /// </summary> public MailRequestAttachments[] Attachments { get { return this._p_w_uploadsField; } set { this._p_w_uploadsField = value; } } }
/// <summary> /// 发送邮件请求附件 /// </summary> public class MailRequestAttachments { #region PrivateFields /// <summary> /// 文件名 /// </summary> private string _fileNameField; /// <summary> /// 文件内容 /// </summary> private byte[] _fileDataField; #endregion /// <summary> /// 文件名 /// </summary> public string FileName { get { return this._fileNameField; } set { this._fileNameField = value; } } /// <summary> /// 文件内容 /// </summary> public byte[] FileData { get { return this._fileDataField; } set { this._fileDataField = value; } } }
附件的内容很简单,因为在网络传输当中,是以字节流的形式传输的,因此附件的传输需要转换成字节流数组。
/// <summary> /// 邮件帮助类 /// </summary> public static class MailHelper { /// <summary> /// 发送邮件 /// </summary> /// <param name="request">邮件内容对象</param> /// <returns>发送邮件所遇到的异常</returns> public static string SendMail(MailRequest request) { try { MailMessage mail = new MailMessage(); if (string.IsNullOrEmpty(request.From)) { request.From = WebConfigurationManager.AppSettings["DefaultMailFrom"]; } mail.From = new MailAddress(request.From); PaserMailAddress(request.To, mail.To); PaserMailAddress(request.CC, mail.CC); PaserMailAddress(request.Bcc, mail.Bcc); mail.Subject = request.Subject; mail.SubjectEncoding = System.Text.Encoding.UTF8; mail.Body = request.Body; mail.ReplyTo = new MailAddress(request.From); mail.IsBodyHtml = true; if (request.Attachments != null && request.Attachments.Length > 0) { for (int i = 0; i < request.Attachments.Length; i++) { Attachment mailAttach = new Attachment(ByteArrayToStream(request.Attachments[i].FileData), request.Attachments[i].FileName); mail.Attachments.Add(mailAttach); } } if (string.IsNullOrEmpty(WebConfigurationManager.AppSettings["SMTPSERVER"])) { throw new ApplicationException("邮件服务无效"); } //Smtp Server SmtpClient mailClient = new SmtpClient(WebConfigurationManager.AppSettings["SMTPSERVER"]); if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["SMTPSERVERPORT"])) { //端口号 try { mailClient.Port = Int32.Parse(WebConfigurationManager.AppSettings["SMTPSERVERPORT"]); } catch { return "SMTP服务器端口设置错误,端口必须设置为数值型"; } } if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["MAILUSER"])) { mailClient.Credentials = new System.Net.NetworkCredential(WebConfigurationManager.AppSettings["MAILUSER"], WebConfigurationManager.AppSettings["MAILUSERPW"]); mailClient.DeliveryMethod = SmtpDeliveryMethod.Network; } else { mailClient.Credentials = CredentialCache.DefaultNetworkCredentials; } mailClient.Send(mail); mail.Dispose(); return "邮件发送成功。"; } catch (SmtpFailedRecipientsException e) { return e.Message; } catch (SmtpFailedRecipientException e) { return e.Message; } catch (SmtpException e) { return e.Message; } catch (Exception e) { return e.Message; } } /// <summary> /// 解析分解邮件地址 /// </summary> /// <param name="mailAddress">邮件地址</param> /// <param name="mailCollection">邮件对象</param> private static void PaserMailAddress(string mailAddress, MailAddressCollection mailCollection) { if (string.IsNullOrEmpty(mailAddress)) { return; } char[] separator = new char[2] { ',', ';' }; string[] addressArray = mailAddress.Split(separator); foreach (string address in addressArray) { if (address.Trim() == string.Empty) { continue; } mailCollection.Add(new MailAddress(address)); } } /// <summary> /// 字节数组转换为流 /// </summary> /// <param name="byteArray">字节数组</param> /// <returns>Stream</returns> private static Stream ByteArrayToStream(byte[] byteArray) { MemoryStream mstream = new MemoryStream(byteArray); return mstream; } }
这是一个邮件助手类,定义成static,无需实例化,直接类名.方法名的形式调用。
只需要上述3个类就可以实现发送Email了,由于上面引用的是web.config里面的信息(asp.net等命名空间,如果是winform等需要自己修改一下),这里还需要配置一下web.config,如下所示:
<appSettings> <!--邮件发送配置--> <add key="SMTPSERVER" value="smtp.qq.com"/> <!--这是服务器邮箱的地址,如果是新浪,则填 smtp.sina.com--> <add key="MAILUSER" value="xxx"/> <!--注意!这是对应服务器邮箱的账号--> <add key="MAILUSERPW" value="yyy"/> <!--注意!这是对应服务器邮箱的账号密码--> </appSettings>
最后上一个测试方法,在主函数当中或者Page_Load事件中执行即可:
private void SendEmailExample() { MailRequest mail = new MailRequest(); mail.Subject = "hello,this is a e-mail sent by asp.net mailhelper.";//主题 mail.Body = "hello,this is a e-mail sent by asp.net mailhelper.<a href='http://blog.csdn.net/guwei4037'>欢迎访问我的博客。</a>";//内容 mail.Bcc = "512122338@qq.com";//秘密抄送人 mail.From = "345822155@qq.com";//发送人 mail.CC = "guwei4037@sina.com";//抄送人 mail.To = "guwei4037@gmail.com";//收件人 //读取文件到bytes FileStream stream = new FileStream(Path.Combine(Server.MapPath("~"), "doc\\test.txt"), FileMode.OpenOrCreate, FileAccess.Read, FileShare.Read); byte[] bytes = new byte[stream.Length]; stream.Read(bytes, 0, bytes.Length); stream.Close(); //附件 MailRequestAttachments p_w_uploads = new MailRequestAttachments(); p_w_uploads.FileName = "test.txt"; p_w_uploads.FileData = bytes; mail.Attachments = new MailRequestAttachments[] { p_w_uploads }; string sendMainResult = "-1"; if (!string.IsNullOrEmpty(mail.CC.Replace(";", "")) && !string.IsNullOrEmpty(mail.To.Replace(";", ""))) { sendMainResult = MailHelper.SendMail(mail); } Response.Write(sendMainResult); }
发送邮件成功,附件也能正常打开,而且多个用户都收到了电子邮件。截图为证。