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深入Lumisoft.NET实现邮件发送功能的方法详解

时间：2021-09-14 03:53 编辑：来源：阅读：
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摘要：深入Lumisoft.NET实现邮件发送功能的方法详解

在前面的一些文章中，有介绍过DotNet内置SMTP类的邮件发送功能，附件、嵌入图片的模式都有介绍，本文继续介绍Lumisoft.NET这个非常优秀的开源组件，用该组件来设计开发邮件工具，将变得更加方便，功能更加强大。网上很多文章基本介绍如何使用该组件来收取邮件较多，较少介绍使用该组件做邮件发送功能的。本文主要探寻使用该组件实现邮件的发送功能，邮件发送有两种方式，一种是不用发件人即可发送邮件，一种是使用发件人账户密码和SMTP服务器来实现邮件发送的，本文分别对这两种方式进行介绍。组件下载地址：http://www.lumisoft.ee/lswww/download/downloads/ 组件论坛地址：http://www.lumisoft.ee/Forum/default.aspx?g=forum 秉承一贯的做法，先贴出相关的实现图形，感官认识下，在进入详细的介绍说明，以求达到最好的理解深度。 [b]1、首先是发件人的设置，可以从文本文件的导出，以及新建等操作，以方便用户操作。 [/b] [img]http://img.1sucai.cn/uploads/article/2018010710/20180107100109_0_57517.png[/img] [b]2、[/b] 内容也支持导入导出，并且保存到数据库，方便进行记录及操作等，另外可以对内容进行随机混淆，混淆的内容在HTML邮件中式隐藏的，方便糊弄一下服务器的识别。 [img]http://img.1sucai.cn/uploads/article/2018010710/20180107100109_1_29123.png[/img] [b]3、[/b] 邮件发送可以选择两种方式，下面将分别介绍这两种方式的实现，一种采用该控件封装非常好的邮件直投技术，不需要SMTP账号发送的；一种是普通的SMTP发送方式。当然我们还可以设置更多的参数，例如邮件尾部信息、HTML内容提示、以及一些发送期间自动拨号的设置操作等。 [img]http://img.1sucai.cn/uploads/article/2018010710/20180107100110_2_55023.png[/img] [b]4、[/b] 邮件直投技术，通过模拟账户来附加用户的邮件地址（或者可以成为伪装）。其中我填写了一些常用的SMTP服务器的域名，方便在其中构造合乎要求的邮件格式，还可以设置邮件回执通知，如下图所示。 [img]http://img.1sucai.cn/uploads/article/2018010710/20180107100110_3_60401.png[/img] [b]5、[/b] 如果是采用普通发送方式，那么就需要制定用户的账号密码等信息，发送的时候，自动从启动获取发件人信息进行批量发送操作。 [img]http://img.1sucai.cn/uploads/article/2018010710/20180107100111_4_81085.png[/img] [b]6、[/b] 最后体验一下少量邮件的发送效果，发送采用多线程发送，多线程采用比较有名的SmartThreadPool组件，并且发送过程总详细记录其中的日志，供参考。

[img]http://img.1sucai.cn/uploads/article/2018010710/20180107100111_5_96049.png[/img]

介绍完毕相关的功能效果图，下面我们来分析下主要功能实现的代码：

[u]复制代码[/u] 代码如下:

private TimerHelper timer = null;
        private void btnSend_Click(object sender, EventArgs e)
        {
            //重置计数变量
            failedItems = 0;
            successItems = 0;

            workItemsCompleted = 0;
            workItemsGenerated = 0;

            Portal.gc.FailedCount = 0;//重置失败次数

            STPStartInfo stpStartInfo = new STPStartInfo();
            stpStartInfo.IdleTimeout = 10;
            stpStartInfo.MaxWorkerThreads = 100;
            stpStartInfo.MinWorkerThreads = 0;
            //stpStartInfo.StartSuspended = true;
            _smartThreadPool = new SmartThreadPool(stpStartInfo);
            _workItemsGroup = _smartThreadPool;

            workItemsProducerThread = new Thread(new ThreadStart(this.WorkItemsProducer));
            workItemsProducerThread.IsBackground = true;
            workItemsProducerThread.Start();

            RefreshStatusCount();

            int intervalRedial = SystemConfig.Default.IntervalRedial * 1000 * 60;
            if (intervalRedial > 0)
            {
                if (timer != null)
                {
                    timer.Stop();
                    timer.Dispose();
                }
                timer = new TimerHelper(intervalRedial,false);
                timer.Execute += new TimerHelper.TimerExecution(timer_Execute);
                timer.Start();
            }
        }

        private static object locker = new object();
        private void timer_Execute()
        {
            if (Monitor.TryEnter(locker))
            {
                string message = string.Format("在时间 {0} 时刻执行了一次重拨号操作！", DateTime.Now);
                ShowSendStatus(message);

                string RasName = SystemConfig.Default.RasName;
                if (!string.IsNullOrEmpty(RasName))
                {
                    message = string.Format("正在准备重新拨号（{0}）", RasName);
                    ShowSendStatus(message);

                    Portal.gc.ReConnect(RasName);
                    Portal.gc.FailedCount = 0;//重新归零
                }

                Monitor.Exit(locker);
            }
            else
            {
                Monitor.Enter(locker);
                Monitor.Exit(locker);
            }
        }

上面是主要的任务生成操作以及相关的拨号操作，其中任务详细的生成代码如下所示。 private void WorkItemsProducer()

[u]复制代码[/u] 代码如下:

{
            CallCtrlWithThreadSafetyEx.SetText(this.txtSendDetail, "");

            EnableControl(false, true, true);
            string message = string.Format("任务开始");
            RecordMessage(message);
            #region 生成任务

            IWorkItemsGroup workItemsGroup = _workItemsGroup;
            if (null == workItemsGroup)
            {
                return;
            }

            List<string> addressList = GetAddressList();
            List<MyMailInfo> mailInfoList = GetMailInfo();
            for (int i = 0; i < addressList.Count; i++)
            {
                try
                {
                    SendJobInfo jobInfo = new SendJobInfo();
                    jobInfo.domainList = mailDomainList;
                    jobInfo.mailTo = addressList[i];
                    jobInfo.mailInfo = GetOneMail(mailInfoList, i);
                    jobInfo.ShowSendStatus = ShowSendStatus;
                    jobInfo.currentDomain = (i % mailDomainList.Count);//设置一个标志，默认那个账户开始发送
                    jobInfo.UseDirectSendType = SystemConfig.Default.EmailDirectSend;

                    //如果用户未指定发送账号，那么采用默认的显示名称
                    //如果为空，发送的时候，会自动采用邮件地址作为显示名称
                    if (string.IsNullOrEmpty(SystemConfig.Default.UserEmailFrom))
                    {
                        jobInfo.mailFromDisplay = SystemConfig.Default.DefaultFromDisplayName;
                    }

                    workItemCallback = new WorkItemCallback(this.DoWork);
                    workItemsGroup.QueueWorkItem(workItemCallback, jobInfo);
                    Thread.Sleep(100);
                }
                catch (ObjectDisposedException ex)
                {
                    LogTextHelper.WriteLine(ex.ToString());
                    continue;
                }

                Interlocked.Increment(ref workItemsGenerated);
            }

            #endregion

            RefreshStatusCount();
            message = string.Format("共有 {0} 个任务，还剩下 {1} 个",
                workItemsGenerated, workItemsGenerated - workItemsCompleted);
            CallCtrlWithThreadSafetyEx.SetText(this, message);
            RecordMessage(message);

            try
            {
                //workItemsGroup.Start();
                workItemsGroup.WaitForIdle();
                _smartThreadPool.Shutdown();
            }
            catch (Exception ex)
            {
                LogTextHelper.WriteLine(ex.ToString());
            }

            UpdateFinishStatus();
        }

由于采用了多线程来处理，所以停止发送的时候，需要把相关的线程对象进行释放，如下代码所示。

[u]复制代码[/u] 代码如下:

private void btnStop_Click(object sender, EventArgs e)
        {
            try
            {
                _smartThreadPool.Shutdown();
                _smartThreadPool.Dispose();
                _smartThreadPool = null;
                if (timer != null)
                {
                    timer.Stop();
                    timer.Dispose();
                }
            }
            catch (Exception ex)
            {
                LogTextHelper.WriteLine(ex.ToString());
            }

            UpdateFinishStatus();
        }

其中具体的邮件发送功能封装在SendJobInfo中，通过判断不同的类型，进行不同的发送操作。其中最为关键的发送代码，就是如何利用LumiSoft.NET组件来构造相应的邮件对象，下面先先介绍下邮件直投的发送方式，由于该组件封装比较好，直投发送方式很简单：

[u]复制代码[/u] 代码如下:

Mail_Message message = Create_PlainText_Html_Attachment_Image(mailTo, mailFrom, mailFromDisplay);
SMTP_Client.QuickSend(message);

其中Create_PlainText_Html_Attachment_Image的封装函数详细内容如下所示：

[u]复制代码[/u] 代码如下:

代码
       private Mail_Message Create_PlainText_Html_Attachment_Image(string mailTo, string mailFrom, string mailFromDisplay)
        {
            Mail_Message msg = new Mail_Message();
            msg.MimeVersion = "1.0";
            msg.MessageID = MIME_Utils.CreateMessageID();
            msg.Date = DateTime.Now;
            msg.From = new Mail_t_MailboxList();
            msg.From.Add(new Mail_t_Mailbox(mailFromDisplay, mailFrom));
            msg.To = new Mail_t_AddressList();
            msg.To.Add(new Mail_t_Mailbox(mailTo, mailTo));
            msg.Subject = mailInfo.Title;

            //设置回执通知
            string notifyEmail = SystemConfig.Default.DispositionNotificationTo;
            if (!string.IsNullOrEmpty(notifyEmail) && ValidateUtil.IsEmail(notifyEmail))
            {
                msg.DispositionNotificationTo = new Mail_t_Mailbox(notifyEmail, notifyEmail);
            }

            #region MyRegion
            //--- multipart/mixed -----------------------------------
            MIME_h_ContentType contentType_multipartMixed = new MIME_h_ContentType(MIME_MediaTypes.Multipart.mixed);
            contentType_multipartMixed.Param_Boundary = Guid.NewGuid().ToString().Replace('-', '.');
            MIME_b_MultipartMixed multipartMixed = new MIME_b_MultipartMixed(contentType_multipartMixed);
            msg.Body = multipartMixed;

            //--- multipart/alternative -----------------------------
            MIME_Entity entity_multipartAlternative = new MIME_Entity();
            MIME_h_ContentType contentType_multipartAlternative = new MIME_h_ContentType(MIME_MediaTypes.Multipart.alternative);
            contentType_multipartAlternative.Param_Boundary = Guid.NewGuid().ToString().Replace('-', '.');
            MIME_b_MultipartAlternative multipartAlternative = new MIME_b_MultipartAlternative(contentType_multipartAlternative);
            entity_multipartAlternative.Body = multipartAlternative;
            multipartMixed.BodyParts.Add(entity_multipartAlternative);

            //--- text/plain ----------------------------------------
            MIME_Entity entity_text_plain = new MIME_Entity();
            MIME_b_Text text_plain = new MIME_b_Text(MIME_MediaTypes.Text.plain);
            entity_text_plain.Body = text_plain;

            //普通文本邮件内容，如果对方的收件客户端不支持HTML，这是必需的
            string plainTextBody = "如果你邮件客户端不支持HTML格式，或者你切换到“普通文本”视图，将看到此内容";
            if (!string.IsNullOrEmpty(SystemConfig.Default.PlaintTextTips))
            {
                plainTextBody = SystemConfig.Default.PlaintTextTips;
            }

            text_plain.SetText(MIME_TransferEncodings.QuotedPrintable, Encoding.UTF8, plainTextBody);
            multipartAlternative.BodyParts.Add(entity_text_plain);

            //--- text/html -----------------------------------------
            string htmlText = mailInfo.Content;//"<html>这是一份测试邮件，<img src="cid:test.jpg">来自<font color=red><b>LumiSoft.Net</b></font></html>";
            MIME_Entity entity_text_html = new MIME_Entity();
            MIME_b_Text text_html = new MIME_b_Text(MIME_MediaTypes.Text.html);
            entity_text_html.Body = text_html;
            text_html.SetText(MIME_TransferEncodings.QuotedPrintable, Encoding.UTF8, htmlText);
            multipartAlternative.BodyParts.Add(entity_text_html);

            //--- application/octet-stream -------------------------
            foreach (string attach in mailInfo.Attachments)
            {
                multipartMixed.BodyParts.Add(Mail_Message.CreateAttachment(attach));
            }

            foreach (string imageFile in mailInfo.EmbedImages)
            {
                MIME_Entity entity_image = new MIME_Entity();
                entity_image.ContentDisposition = new MIME_h_ContentDisposition(MIME_DispositionTypes.Inline);
                string fileName = DirectoryUtil.GetFileName(imageFile, true);
                entity_image.ContentID = BytesTools.BytesToHex(Encoding.Default.GetBytes(fileName));               
                MIME_b_Image body_image = new MIME_b_Image(MIME_MediaTypes.Image.jpeg);
                entity_image.Body = body_image;
                body_image.SetDataFromFile(imageFile, MIME_TransferEncodings.Base64);
                multipartMixed.BodyParts.Add(entity_image);
            }

            #endregion

            return msg;
        }

如果使用普通的账号方式发送SMTP邮件，主要代码如下所示，其中可以看出是利用了命令方式一步步和服务器进行交互的。

[u]复制代码[/u] 代码如下:

using (SMTP_Client client = new SMTP_Client())
                    {
                        int port = domainInfo.Ssl ? WellKnownPorts.SMTP_SSL : WellKnownPorts.SMTP;
                        if (domainInfo.Port > 0)
                        {
                            port = domainInfo.Port;
                        }
                        client.Connect(domainInfo.SmtpServer, port, domainInfo.Ssl);
                        client.Authenticate(domainInfo.Username, domainInfo.Password);
                        //string text = client.GreetingText;
                        client.MailFrom(mailFrom, -1);
                        client.RcptTo(mailTo);

                        MemoryStream stream = Create_Html_Attachment_Image(mailTo, mailFrom, mailFromDisplay);
                        client.SendMessage(stream);
                        client.Disconnect();
                    }

其中构造邮件内容的代码和刚才的部分类似，详细代码如下所示。

[u]复制代码[/u] 代码如下:

private MemoryStream Create_Html_Attachment_Image(string mailTo, string mailFrom, string mailFromDisplay)
        {
            Mime m = new Mime();
            MimeEntity mainEntity = m.MainEntity;
            mainEntity.From = new AddressList();
            mainEntity.From.Add(new MailboxAddress(mailFromDisplay, mailFrom));

            mainEntity.To = new AddressList();
            mainEntity.To.Add(new MailboxAddress(mailTo, mailTo));
            mainEntity.Subject = mailInfo.Title;
            mainEntity.ContentType = MediaType_enum.Multipart_mixed;

            MimeEntity textEntity = mainEntity.ChildEntities.Add();
            textEntity.ContentType = MediaType_enum.Text_html;
            textEntity.ContentTransferEncoding = ContentTransferEncoding_enum.QuotedPrintable;
            textEntity.DataText = mailInfo.Content;
.........................         

        MemoryStream msg = new MemoryStream();
            m.ToStream(msg);
            msg.Position = 0;

            return msg;
        }

利用Lumisoft.NET这个组件，可以实现很多相关的邮件操作，这里介于兴趣及篇幅原因，主要介绍邮件发送的功能模块，其中贴出的代码，一个是为了和感兴趣的朋友相互交流，一个也是为了自己今后做一个借鉴，并不鼓励大家用此软件或者代码来大批量发送垃圾邮件。

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