//============================================================ // File: MailSender.cs // 邮件发送组件 // 支持ESMTP, 多附件 //============================================================
namespace JcPersonal.Utility { using System; using System.Collections; using System.Net.Sockets; using System.IO; using System.Text;
/// <summary> /// Mail 发送器 /// </summary> public class MailSender { /// <summary> /// SMTP服务器域名 /// </summary> public string Server { get { return server; } set { if (value != server) server = value; } } private string server = "";
/// <summary> /// SMTP服务器端口 [默认为25] /// </summary> public int Port { get { return port; } set { if (value != port) port = value; } } private int port = 25;
/// <summary> /// 用户名 [如果需要身份验证的话] /// </summary> public string UserName { get { return userName; } set { if (value != userName) userName = value; } } private string userName = "";
/// <summary> /// 密码 [如果需要身份验证的话] /// </summary> public string Password { get { return password; } set { if (value != password) password = value; } } private string password = "";
/// <summary> /// 发件人地址 /// </summary> public string From { get { return from; } set { if (value != from) from = value;} } private string from = "";
/// <summary> /// 收件人地址 /// </summary> public string To { get { return to; } set { if (value != to) to = value;} } private string to = "";
/// <summary> /// 发件人姓名 /// </summary> public string FromName { get { return fromName; } set { if (value != fromName) fromName = value; } } private string fromName = "";
/// <summary> /// 收件人姓名 /// </summary> public string ToName { get { return toName; } set { if (value != toName) toName = value; } } private string toName = "";
/// <summary> /// 邮件的主题 /// </summary> public string Subject { get { return subject; } set { if (value != subject) subject = value; } } private string subject = "";
/// <summary> /// 邮件正文 /// </summary> public string Body { get { return body; } set { if (value != body) body = value; } } private string body = "";
/// <summary> /// 超文本格式的邮件正文 /// </summary> public string HtmlBody { get { return htmlBody; } set { if (value != htmlBody) htmlBody = value; } } private string htmlBody = "";
/// <summary> /// 是否是html格式的邮件 /// </summary> public bool IsHtml { get { return isHtml; } set { if (value != isHtml) isHtml = value; } } private bool isHtml = false;
/// <summary> /// 语言编码 [默认为GB2312] /// </summary> public string LanguageEncoding { get { return languageEncoding; } set { if (value != languageEncoding) languageEncoding = value; } } private string languageEncoding = "GB2312";
/// <summary> /// 邮件编码 [默认为8bit] /// </summary> public string MailEncoding { get { return encoding; } set { if (value != encoding) encoding = value; } } private string encoding = "8bit";
/// <summary> /// 邮件优先级 [默认为3] /// </summary> public int Priority { get { return priority; } set { if (value != priority) priority = value; } } private int priority = 3;
/// <summary> /// 附件 [AttachmentInfo] /// </summary> public IList Attachments { get { return attachments; } // set { if (value != attachments) attachments = value; } } private ArrayList attachments = new ArrayList ();
/// <summary> /// 发送邮件 /// </summary> public void SendMail () { // 创建TcpClient对象, 并建立连接 TcpClient tcp = null; try { tcp = new TcpClient (server, port); } catch (Exception) { throw new Exception ("无法连接服务器"); }
ReadString (tcp.GetStream());//获取连接信息
// 开始进行服务器认证 // 如果状态码是250则表示操作成功 if (!Command (tcp.GetStream(), "EHLO Localhost", "250")) throw new Exception ("登陆阶段失败");
if (userName != "") { // 需要身份验证 if (!Command (tcp.GetStream(), "AUTH LOGIN", "334")) throw new Exception ("身份验证阶段失败"); string nameB64 = ToBase64 (userName); // 此处将username转换为Base64码 if (!Command (tcp.GetStream(), nameB64, "334")) throw new Exception ("身份验证阶段失败"); string passB64 = ToBase64 (password); // 此处将password转换为Base64码 if (!Command (tcp.GetStream(), passB64, "235")) throw new Exception ("身份验证阶段失败"); }
// 准备发送 WriteString (tcp.GetStream(), "mail From: " + from); WriteString (tcp.GetStream(), "rcpt to: " + to); WriteString (tcp.GetStream(), "data");
// 发送邮件头 WriteString (tcp.GetStream(), "Date: " + DateTime.Now); // 时间 WriteString (tcp.GetStream(), "From: " + fromName + "<" + from + ">"); // 发件人 WriteString (tcp.GetStream(), "Subject: " + subject); // 主题 WriteString (tcp.GetStream(), "To:" + toName + "<" + to + ">"); // 收件人
//邮件格式 WriteString (tcp.GetStream(), "Content-Type: multipart/mixed; boundary=\"unique-boundary-1\""); WriteString (tcp.GetStream(), "Reply-To:" + from); // 回复地址 WriteString (tcp.GetStream(), "X-Priority:" + priority); // 优先级 WriteString (tcp.GetStream(), "MIME-Version:1.0"); // MIME版本
// 数据ID,随意 // WriteString (tcp.GetStream(), "Message-Id: " + DateTime.Now.ToFileTime() + "@security.com"); WriteString (tcp.GetStream(), "Content-Transfer-Encoding:" + encoding); // 内容编码 WriteString (tcp.GetStream(), "X-Mailer:JcPersonal.Utility.MailSender"); // 邮件发送者 WriteString (tcp.GetStream(), "");
WriteString (tcp.GetStream(), ToBase64 ("This is a multi-part message in MIME format.")); WriteString (tcp.GetStream(), "");
// 从此处开始进行分隔输入 WriteString (tcp.GetStream(), "--unique-boundary-1");
// 在此处定义第二个分隔符 WriteString (tcp.GetStream(), "Content-Type: multipart/alternative;Boundary=\"unique-boundary-2\""); WriteString (tcp.GetStream(), "");
if(!isHtml) { // 文本信息 WriteString (tcp.GetStream(), "--unique-boundary-2"); WriteString (tcp.GetStream(), "Content-Type: text/plain;charset=" + languageEncoding); WriteString (tcp.GetStream(), "Content-Transfer-Encoding:" + encoding); WriteString (tcp.GetStream(), ""); WriteString (tcp.GetStream(), body); WriteString (tcp.GetStream(), "");//一个部分写完之后就写如空信息,分段 WriteString (tcp.GetStream(), "--unique-boundary-2--");//分隔符的结束符号,尾巴后面多了-- WriteString (tcp.GetStream(), ""); } else { //html信息 WriteString (tcp.GetStream(), "--unique-boundary-2"); WriteString (tcp.GetStream(), "Content-Type: text/html;charset=" + languageEncoding); WriteString (tcp.GetStream(), "Content-Transfer-Encoding:" + encoding); WriteString (tcp.GetStream(), ""); WriteString (tcp.GetStream(), htmlBody); WriteString (tcp.GetStream(), ""); WriteString (tcp.GetStream(), "--unique-boundary-2--");//分隔符的结束符号,尾巴后面多了-- WriteString (tcp.GetStream(), ""); }
// 发送附件 // 对文件列表做循环 for (int i = 0; i < attachments.Count; i++) { WriteString (tcp.GetStream(), "--unique-boundary-1"); // 邮件内容分隔符 WriteString (tcp.GetStream(), "Content-Type: application/octet-stream;name=\"" + ((AttachmentInfo)attachments[i]).FileName + "\""); // 文件格式 WriteString (tcp.GetStream(), "Content-Transfer-Encoding: base64"); // 内容的编码 WriteString (tcp.GetStream(), "Content-Disposition:attachment;filename=\"" + ((AttachmentInfo)attachments[i]).FileName + "\""); // 文件名 WriteString (tcp.GetStream(), ""); WriteString (tcp.GetStream(), ((AttachmentInfo)attachments[i]).Bytes); // 写入文件的内容 WriteString (tcp.GetStream(), ""); }
Command (tcp.GetStream(), ".", "250"); // 最后写完了,输入"."
// 关闭连接 tcp.Close (); }
/// <summary> /// 向流中写入字符 /// </summary> /// <param name="netStream">来自TcpClient的流</param> /// <param name="str">写入的字符</param> protected void WriteString (NetworkStream netStream, string str) { str = str + "\r\n"; // 加入换行符
// 将命令行转化为byte[] byte[] bWrite = Encoding.GetEncoding(languageEncoding).GetBytes(str.ToCharArray());
// 由于每次写入的数据大小是有限制的,那么我们将每次写入的数据长度定在75个字节,一旦命令长度超过了75,就分步写入。 int start=0; int length=bWrite.Length; int page=0; int size=75; int count=size; try { if (length>75) { // 数据分页 if ((length/size)*size<length) page=length/size+1; else page=length/size; for (int i=0;i<page;i++) { start=i*size; if (i==page-1) count=length-(i*size); netStream.Write(bWrite,start,count);// 将数据写入到服务器上 } } else netStream.Write(bWrite,0,bWrite.Length); } catch(Exception) { // 忽略错误 } }
/// <summary> /// 从流中读取字符 /// </summary> /// <param name="netStream">来自TcpClient的流</param> /// <returns>读取的字符</returns> protected string ReadString (NetworkStream netStream) { string sp = null; byte[] by = new byte[1024]; int size = netStream.Read(by,0,by.Length);// 读取数据流 if (size > 0) { sp = Encoding.Default.GetString(by);// 转化为String } return sp; }
/// <summary> /// 发出命令并判断返回信息是否正确 /// </summary> /// <param name="netStream">来自TcpClient的流</param> /// <param name="command">命令</param> /// <param name="state">正确的状态码</param> /// <returns>是否正确</returns> protected bool Command (NetworkStream netStream, string command, string state) { string sp=null; bool success=false; try { WriteString (netStream, command);// 写入命令 sp = ReadString (netStream);// 接受返回信息 if (sp.IndexOf(state) != -1)// 判断状态码是否正确 success=true; } catch(Exception) { // 忽略错误 } return success; }
/// <summary> /// 字符串编码为Base64 /// </summary> /// <param name="str">字符串</param> /// <returns>Base64编码的字符串</returns> protected string ToBase64 (string str) { try { byte[] by = Encoding.Default.GetBytes (str.ToCharArray()); str = Convert.ToBase64String (by); } catch(Exception) { // 忽略错误 } return str; }
/// <summary> /// 附件信息 /// </summary> public struct AttachmentInfo { /// <summary> /// 附件的文件名 [如果输入路径,则自动转换为文件名] /// </summary> public string FileName { get { return fileName; } set { fileName = Path.GetFileName(value); } } private string fileName;
/// <summary> /// 附件的内容 [由经Base64编码的字节组成] /// </summary> public string Bytes { get { return bytes; } set { if (value != bytes) bytes = value; } } private string bytes;
/// <summary> /// 从流中读取附件内容并构造 /// </summary> /// <param name="ifileName">附件的文件名</param> /// <param name="stream">流</param> public AttachmentInfo (string ifileName, Stream stream) { fileName = Path.GetFileName (ifileName); byte[] by = new byte [stream.Length]; stream.Read (by,0,(int)stream.Length); // 读取文件内容 //格式转换 bytes = Convert.ToBase64String (by); // 转化为base64编码 }
/// <summary> /// 按照给定的字节构造附件 /// </summary> /// <param name="ifileName">附件的文件名</param> /// <param name="ibytes">附件的内容 [字节]</param> public AttachmentInfo (string ifileName, byte[] ibytes) { fileName = Path.GetFileName (ifileName); bytes = Convert.ToBase64String (ibytes); // 转化为base64编码 }
/// <summary> /// 从文件载入并构造 /// </summary> /// <param name="path"></param> public AttachmentInfo (string path) { fileName = Path.GetFileName (path); FileStream file = new FileStream (path, FileMode.Open); byte[] by = new byte [file.Length]; file.Read (by,0,(int)file.Length); // 读取文件内容 //格式转换 bytes = Convert.ToBase64String (by); // 转化为base64编码 file.Close (); } } } }
// 使用:
MailSender ms = new MailSender (); ms.From = "[email protected]"; ms.To = "[email protected]"; ms.Subject = "Subject"; ms.Body = "body text"; ms.UserName = "########"; // 怎么能告诉你呢 ms.Password = "********"; // 怎么能告诉你呢 ms.Server = "smtp.tom.com";
ms.Attachments.Add (new MailSender.AttachmentInfo (@"D:\test.txt"));
Console.WriteLine ("mail sending..."); try { ms.SendMail (); Console.WriteLine ("mail sended."); } catch (Exception e) { Console.WriteLine (e); }

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