[原創]EMAIL發送系統(C#+基於SMTP認證)
http://www.lionsky.net/MyWebsite/article/list.aspx?id=430
的改版
在爲公司寫通知服務時，從網上找到了以上地址，非常感謝原作者創造性的勞動。改寫的目的是爲了適應作爲服務運行的要求：
1、適應多線程的要求，發送郵件服務可在後臺運行，將與SMTP服務器的連接視爲獨佔資源。
2、適應穩定性的要求，不再以簡單地拋出異常來處理錯誤，在出現異常後等待一定時間間隔後重試，重試一段時間間隔後若還時發不出去，則認爲是SMTP出錯，返回發送郵件不成功的標識。
3、精簡屬性、方法，與郵件相關的信息不再作爲屬性，而是作爲send的參數傳入；只公佈了一個無重載的send方法。以此類爲基類，另寫通知服務要求的接口方法。
以下是改寫後的代碼：
using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Collections;
using System.Threading;
namespace Deep.SendEmail
{
#region AspNetPager Server Control
/// <summary>
/// 郵件可以通過 Microsoft Windows 2000 中內置的 SMTP 郵件服務或任意 SMTP 服務器來傳送
/// </summary>
public class SmtpMail
{
private const string ENTER="/r/n";
/// <summary>
/// 設定語言代碼，默認設定爲GB2312，如不需要可設置爲""
/// </summary>
private string m_charset="GB2312";
/// <summary>
/// 服務器交互記錄
/// </summary>
private StringBuilder m_logs = new StringBuilder();
private string m_ErrCode;
/// <summary>
/// SMTP錯誤代碼哈希表
/// </summary>
private Hashtable m_ErrCodeHT = new Hashtable();
/// <summary>
/// SMTP正確代碼哈希表
/// </summary>
private Hashtable m_RightCodeHT = new Hashtable();
/// <summary>
/// 最多收件人數量
/// </summary>
private int m_recipientMaxnum = 2;
/// <summary>
/// 重複時間，以秒爲單位
/// </summary>
private int m_RepeatTime = 120;
/// <summary>
/// 服務器出錯或拒絕後的等待時間,以毫秒爲單位
/// </summary>
private int m_WaitTime = 20000;
/// <summary>
/// 初始化 <see cref="Lion.Web.Mail.SmtpMail"/> 類的新實例
/// </summary>
public SmtpMail()
{
SMTPCodeAdd();
}
#region Properties 定義屬性
/// <summary>
/// 服務器交互記錄，如發現本組件不能使用的SMTP服務器，請將出錯時的Logs發給我（[email protected]），我將盡快查明原因。
/// </summary>
public string Logs
{
get
{
return m_logs.ToString();
}
}
/// <summary>
/// 最多收件人數量
/// </summary>
public int RecipientMaxNum
{
set
{
m_recipientMaxnum = value;
}
get
{
return m_recipientMaxnum;
}
}
/// <summary>
/// 設定語言代碼，默認設定爲GB2312，如不需要可設置爲""
/// </summary>
public string Charset
{
get
{
return this.m_charset;
}
set
{
this.m_charset = value;
}
}
/// <summary>
/// 重複時間，以秒爲單位
/// </summary>
public int RepeatTime
{
get {return m_RepeatTime;}
set {m_RepeatTime = value;}
}
/// <summary>
/// 服務器出錯或拒絕後的等待時間,以毫秒爲單位
/// </summary>
public int WaitTime
{
get {return m_WaitTime;}
set {m_WaitTime = value > 10000?value:10000;}
}
#endregion
#region Methods 定義方法
/// <summary>
/// 郵件服務器域名和驗證信息
/// 形如："user:[email protected]:25"，也可省略次要信息。如"user:[email protected]"或"www.server.com"
/// </summary>
/// <param name="mailDomain">輸入用戶名、密碼、郵件服務器域名、端口號</param>
/// <param name="mailServer">返回郵件服務器域名</param>
/// <param name="mailServerUserName">返回用戶名</param>
/// <param name="password">返回密碼</param>
/// <param name="mailserverport">返回端口號</param>
/// <param name="needSmtp">返回是否需要SMTP驗證</param>
/// <returns></returns>
private bool SetMailDomain(string mailDomain,out string mailServer,out string mailServerUserName,out string password,
out int mailserverport,out bool needSmtp)
{
bool isRight = false;
//爲輸出變量賦初值
mailServer = string.Empty;
mailServerUserName = String.Empty;
password = String.Empty;
mailserverport = 25;
needSmtp = false;
mailServer = mailDomain.Trim();
int tempint;
if( mailServer != "" )
{
tempint = mailServer.IndexOf("@");
isRight = true;
if(tempint!=-1)
{
string str = mailServer.Substring(0,tempint);
mailServerUserName = str.Substring(0,str.IndexOf(":"));
password = str.Substring(str.IndexOf(":")+1,str.Length-str.IndexOf(":")-1);
needSmtp = !(password==string.Empty);
mailServer = mailDomain.Substring(tempint+1,mailDomain.Length-tempint-1);
}
tempint = mailServer.IndexOf(":");
if(tempint != -1)
{
mailserverport = System.Convert.ToInt32(mailServer.Substring(tempint+1,mailServer.Length-tempint-1));
mailServer = mailServer.Substring(0,tempint);
}
}
return isRight;
}
/// <summary>
/// 添加郵件附件
/// </summary>
/// <param name="filePath">附件絕對路徑</param>
private IList AddAttachment(params string[] filePath)
{
if(filePath == null || filePath.Length == 0)
{
return null;
}
IList m_Attachments = new System.Collections.ArrayList();// 郵件附件列表
for(int i=0;i<filePath.Length;i++)
{
if(File.Exists(filePath[i]))
{
m_Attachments.Add(filePath[i]);
}
else
{
m_logs.Append("錯誤：沒找到文件名爲"+filePath[i]+"的附件文件！"+ENTER);
}
}
return m_Attachments;
}
/// <summary>
/// 添加一組收件人（不超過m_recipientMaxnum個），參數爲字符串數組
/// </summary>
/// <param name="recipients">保存有收件人地址的字符串數組（不超過m_recipientMaxnum個）</param>
private Hashtable AddRecipient(params string[] recipients)
{
if(recipients==null || recipients.Length == 0)
{
return null;
}
Hashtable recipientList=new Hashtable();// 收件人列表
for(int i=0;i<recipients.Length;i++)
{
string recipient = recipients[i].Trim();
if(recipient !=String.Empty && recipient.IndexOf("@") != -1)
{
recipientList.Add(recipientList.Count,recipients[i]);
}
}
return recipientList;
}
/// <summary>
/// 發送郵件方法
/// </summary>
/// <param name="smtpServer">smtp服務器信息，如"username:[email protected]:25"，也可去掉部分次要信息，如"www.smtpServer.com"</param>
/// <param name="from">發件人mail地址</param>
/// <param name="fromname">發件人姓名</param>
/// <param name="to">收件人地址列表</param>
/// <param name="toname">收件人姓名</param>
/// <param name="html">是否HTML郵件</param>
/// <param name="subject">郵件主題</param>
/// <param name="body">郵件正文</param>
/// <param name="filePath">郵件附件列表</param>
public bool Send(string smtpServer,string from,string fromName,string[] recipientADD,string recipientName,bool isHtml,string subject,Priority priority, string body,string[] filePath)
{
//如果收件人多於服務器可同時發送的最大值，則分多次發送
if(recipientADD.Length > RecipientMaxNum)
{
string[] recipientADD1 = new string[RecipientMaxNum];
string[] recipientADD2 = new string[recipientADD.Length - RecipientMaxNum];
for(int i = 0;i < recipientADD.Length; i++)
{
if(i < RecipientMaxNum)
{
recipientADD1[i] = recipientADD[i];
}
else
{
recipientADD2[i - RecipientMaxNum] = recipientADD[i];
}
}
return Send(smtpServer,from,fromName,recipientADD1,recipientName,isHtml,subject,priority, body,filePath)
&&
Send(smtpServer,from,fromName,recipientADD2,recipientName,isHtml,subject,priority, body,filePath);
}
if(m_logs.Length > 2048)
{
m_logs.Remove(0,m_logs.Length);
}
string mailServer="";// 郵件服務器域名
int mailserverport=25;// 郵件服務器端口號
string userName="";// SMTP認證時使用的用戶名
string password="";// SMTP認證時使用的密碼
bool needSmtp=false;// 是否需要SMTP驗證
SetMailDomain(smtpServer,out mailServer,out userName,out password,
out mailserverport,out needSmtp);
if(mailServer.Trim()=="")
{
m_logs.Append("必須指定SMTP服務器"+ENTER);
return false;
}
IList attachments = AddAttachment(filePath);// 郵件附件列表
Hashtable recipients = AddRecipient(recipientADD);// 收件人列表
if(recipients == null || recipients.Count == 0 )
{
m_logs.Append("必須指定收件人"+ENTER);
return false;
}
if(recipients.Count > RecipientMaxNum)
{
m_logs.Append("一次發送的收件人太多"+ENTER);
return false;
}
bool isSuccessful = false;
lock(this)
{
TcpClient tcpClientObject = null;// TcpClient對象，用於連接服務器
NetworkStream networkStreamObject = null;// NetworkStream對象
DateTime dateTimeBegin = DateTime.Now;
int useTime = 0;
while(! ( useTime > RepeatTime || isSuccessful))
{
try
{
tcpClientObject=new TcpClient(mailServer,mailserverport);
networkStreamObject = tcpClientObject.GetStream();
isSuccessful =SendEmail(networkStreamObject,needSmtp,mailServer,userName,password,recipients,from,
fromName,recipientName,subject,priority.ToString(),attachments, isHtml, body);
}
catch(Exception e)
{
m_logs.Append("錯誤："+e.Message+ENTER);
}
finally
{
if(networkStreamObject!=null)networkStreamObject.Close();
if(tcpClientObject!=null)tcpClientObject.Close();
if(!isSuccessful)
{
string n = Thread.CurrentThread.Name;
Thread.Sleep(WaitTime);
}
useTime = ((TimeSpan)(DateTime.Now - dateTimeBegin)).Seconds;
}
}
}
return isSuccessful;
}
#endregion
#region Private Helper Functions
/// <summary>
/// SMTP迴應代碼哈希表
/// </summary>
private void SMTPCodeAdd()
{
m_ErrCodeHT.Add("500","郵箱地址錯誤");
m_ErrCodeHT.Add("501","參數格式錯誤");
m_ErrCodeHT.Add("502","命令不可實現");
m_ErrCodeHT.Add("503","服務器需要SMTP驗證");
m_ErrCodeHT.Add("504","命令參數不可實現");
m_ErrCodeHT.Add("421","服務未就緒，關閉傳輸信道");
m_ErrCodeHT.Add("450","要求的郵件操作未完成，郵箱不可用（例如，郵箱忙）");
m_ErrCodeHT.Add("550","要求的郵件操作未完成，郵箱不可用（例如，郵箱未找到，或不可訪問）");
m_ErrCodeHT.Add("451","放棄要求的操作；處理過程中出錯");
m_ErrCodeHT.Add("551","用戶非本地，請嘗試<forward-path>");
m_ErrCodeHT.Add("452","系統存儲不足，要求的操作未執行");
m_ErrCodeHT.Add("552","過量的存儲分配，要求的操作未執行");
m_ErrCodeHT.Add("553","郵箱名不可用，要求的操作未執行（例如郵箱格式錯誤）");
m_ErrCodeHT.Add("432","需要一個密碼轉換");
m_ErrCodeHT.Add("534","認證機制過於簡單");
m_ErrCodeHT.Add("538","當前請求的認證機制需要加密");
m_ErrCodeHT.Add("454","臨時認證失敗");
m_ErrCodeHT.Add("530","需要認證");
m_RightCodeHT.Add("220","服務就緒");
m_RightCodeHT.Add("250","要求的郵件操作完成");
m_RightCodeHT.Add("251","用戶非本地，將轉發向<forward-path>");
m_RightCodeHT.Add("354","開始郵件輸入，以<enter>.<enter>結束");
m_RightCodeHT.Add("221","服務關閉傳輸信道");
m_RightCodeHT.Add("334","服務器響應驗證Base64字符串");
m_RightCodeHT.Add("235","驗證成功");
}
/// <summary>
/// 將字符串編碼爲Base64字符串
/// </summary>
/// <param name="str">要編碼的字符串</param>
private string Base64Encode(string str)
{
byte[] barray;
barray=Encoding.Default.GetBytes(str);
return Convert.ToBase64String(barray);
}
/// <summary>
/// 將Base64字符串解碼爲普通字符串
/// </summary>
/// <param name="str">要解碼的字符串</param>
private string Base64Decode(string str)
{
byte[] barray;
barray=Convert.FromBase64String(str);
return Encoding.Default.GetString(barray);
}
/// <summary>
/// 得到上傳附件的文件流
/// </summary>
/// <param name="filePath">附件的絕對路徑</param>
private string GetStream(string filePath)
{
byte[] by = null;
System.IO.FileStream FileStr = null;
string streamString = "";
try
{
//建立文件流對象
FileStr=new System.IO.FileStream(filePath,System.IO.FileMode.Open);
by=new byte[System.Convert.ToInt32(FileStr.Length)];
FileStr.Read(by,0,by.Length);
streamString = System.Convert.ToBase64String(by);
}
catch(Exception ex)
{
//寫錯誤日誌
m_logs.Append("錯誤："+ex.Message+ENTER);
}
finally
{
if(FileStr != null)
{
FileStr.Close();
}
}
return streamString;
}
/// <summary>
/// 發送SMTP命令
/// </summary>
private bool SendCommand(string str,NetworkStream _NetworkStreamObject)
{
byte[] WriteBuffer;
if(str==null||str.Trim()==String.Empty)
{
return true;
}
m_logs.Append(str+ENTER);
WriteBuffer = Encoding.Default.GetBytes(str);
try
{
_NetworkStreamObject.Write(WriteBuffer,0,WriteBuffer.Length);
}
catch(Exception ex)
{
//寫日誌
m_logs.Append("錯誤："+ex.Message+ENTER);
return false;
}
return true;
}
/// <summary>
/// 接收SMTP服務器迴應
/// </summary>
private string RecvResponse(NetworkStream _NetworkStreamObject)
{
int StreamSize = 0;
string ReturnValue = String.Empty;
byte[] ReadBuffer = new byte[1024] ;
try
{
StreamSize = _NetworkStreamObject.Read(ReadBuffer,0,ReadBuffer.Length);
}
catch(Exception ex)
{
//寫日誌
m_logs.Append("錯誤："+ex.Message+ENTER);
m_ErrCode = ex.Message;
return "false";
}
if (StreamSize==0)
{
return ReturnValue ;
}
else
{
ReturnValue = Encoding.Default.GetString(ReadBuffer).Substring(0,StreamSize);
m_logs.Append(ReturnValue+ENTER);
return ReturnValue;
}
}
/// <summary>
/// 與服務器交互，發送一條命令並接收回應。
/// </summary>
/// <param name="str">一個要發送的命令</param>
private bool Dialog(string str,NetworkStream _NetworkStream)
{
if(str==null||str.Trim()=="")
{
return true;
}
if(SendCommand(str,_NetworkStream))
{
string RR=RecvResponse(_NetworkStream);
if(RR=="false")
{
return false;
}
string RRCode=RR.Substring(0,3);
if(m_RightCodeHT[RRCode]!=null)
{
return true;
}
else
{
m_ErrCode = RRCode;
return false;
}
}
else
{
return false;
}
}
/// <summary>
/// 與服務器交互，發送一組命令並接收回應。
/// </summary>
private bool Dialog(string[] str,NetworkStream _NetworkStream)
{
for(int i=0;i<str.Length;i++)
{
if(!Dialog(str[i],_NetworkStream))
{
return false;
}
}
return true;
}
/// <summary>
/// SendEmail
/// </summary>
/// <returns></returns>
private bool SendEmail(NetworkStream _NetworkStream,bool needSmtp,string mailServer,string userName,string password,Hashtable recipients,string from,
string fromName,string recipientName,string subject,string priority,IList attachments,bool isHtml,
string body)
{
//驗證網絡連接是否正確
if(m_RightCodeHT[RecvResponse(_NetworkStream).Substring(0,3)]==null)
{
return false;
}
string[] SendBuffer;
string SendBufferstr;
StringBuilder SendBufferstrBuilder = new StringBuilder();
//進行SMTP驗證
if(needSmtp)
{
SendBuffer=new String[4];
SendBuffer[0]="EHLO " + mailServer + ENTER;
SendBuffer[1]="AUTH LOGIN" + ENTER;
SendBuffer[2]=Base64Encode(userName) + ENTER;
SendBuffer[3]=Base64Encode(password) + ENTER;
if(!Dialog(SendBuffer,_NetworkStream))
{
return false;
}
}
else
{
SendBufferstr="HELO " + mailServer + ENTER;
if(!Dialog(SendBufferstr,_NetworkStream))
return false;
}
//
SendBufferstr="MAIL FROM:<" + from + ">" + ENTER;
if(!Dialog(SendBufferstr,_NetworkStream))
return false;
//
SendBuffer=new string[m_recipientMaxnum];
for(int i=0;i<recipients.Count;i++)
{
SendBuffer[i]="RCPT TO:<" + recipients[i].ToString() +">" + ENTER;
}
if(!Dialog(SendBuffer,_NetworkStream))
return false;
SendBufferstr="DATA" + ENTER;
if(!Dialog(SendBufferstr,_NetworkStream))
return false;
SendBufferstrBuilder.Append("From:" + fromName + "<" + from +">" +ENTER);
SendBufferstrBuilder.Append("To:=?"+Charset.ToUpper()+"?B?"+Base64Encode(recipientName)+"?="+"<"+recipients[0]+">"+ENTER);
SendBufferstrBuilder.Append("CC:");
for(int i=0;i<recipients.Count;i++)
{
SendBufferstrBuilder.Append(recipients[i].ToString() + "<" + recipients[i].ToString() +">,");
}
SendBufferstrBuilder.Append(ENTER);
SendBufferstrBuilder.Append(((subject==String.Empty || subject==null)?"Subject:":((Charset=="")?("Subject:" + subject):("Subject:" + "=?" + Charset.ToUpper() + "?B?" + Base64Encode(subject) +"?="))) + ENTER);
SendBufferstrBuilder.Append("X-Priority:" + priority + ENTER);
SendBufferstrBuilder.Append("X-MSMail-Priority:" + priority + ENTER);
SendBufferstrBuilder.Append("Importance:" + priority + ENTER);
SendBufferstrBuilder.Append("X-Mailer: Lion.Web.Mail.SmtpMail Pubclass [cn]" + ENTER);
SendBufferstrBuilder.Append("MIME-Version: 1.0" + ENTER);
if(attachments != null && attachments.Count!=0)
{
SendBufferstrBuilder.Append("Content-Type: multipart/mixed;" + ENTER);
SendBufferstrBuilder.Append(" boundary=/"====="+(isHtml?"001_Dragon520636771063_":"001_Dragon303406132050_")+"=====/""+ENTER+ENTER);
}
if(isHtml)
{
if(attachments != null && attachments.Count==0)
{
SendBufferstrBuilder.Append("Content-Type: multipart/alternative;"+ENTER);//內容格式和分隔符
SendBufferstrBuilder.Append(" boundary=/"=====003_Dragon520636771063_=====/""+ENTER+ENTER);
SendBufferstrBuilder.Append("This is a multi-part message in MIME format."+ENTER+ENTER);
}
else
{
SendBufferstrBuilder.Append("This is a multi-part message in MIME format."+ENTER+ENTER);
SendBufferstrBuilder.Append("--=====001_Dragon520636771063_====="+ENTER);
SendBufferstrBuilder.Append("Content-Type: multipart/alternative;"+ENTER);//內容格式和分隔符
SendBufferstrBuilder.Append(" boundary=/"=====003_Dragon520636771063_=====/""+ENTER+ENTER);
}
SendBufferstrBuilder.Append("--=====003_Dragon520636771063_====="+ENTER);
SendBufferstrBuilder.Append("Content-Type: text/plain;"+ ENTER);
SendBufferstrBuilder.Append(((Charset=="")?(" charset=/"iso-8859-1/""):(" charset=/"" + Charset.ToLower() + "/"")) + ENTER);
SendBufferstrBuilder.Append("Content-Transfer-Encoding: base64" + ENTER + ENTER);
SendBufferstrBuilder.Append(Base64Encode("郵件內容爲HTML格式，請選擇HTML方式查看") + ENTER + ENTER);
SendBufferstrBuilder.Append("--=====003_Dragon520636771063_====="+ENTER);
SendBufferstrBuilder.Append("Content-Type: text/html;" + ENTER);
SendBufferstrBuilder.Append(((Charset=="")?(" charset=/"iso-8859-1/""):(" charset=/"" + Charset.ToLower() + "/"")) + ENTER);
SendBufferstrBuilder.Append("Content-Transfer-Encoding: base64" + ENTER + ENTER);
SendBufferstrBuilder.Append(Base64Encode(body) + ENTER + ENTER);
SendBufferstrBuilder.Append("--=====003_Dragon520636771063_=====--"+ENTER);
}
else
{
if(attachments != null && attachments.Count!=0)
{
SendBufferstrBuilder.Append("--=====001_Dragon303406132050_====="+ENTER);
}
SendBufferstrBuilder.Append("Content-Type: text/plain;" + ENTER);
SendBufferstrBuilder.Append(((Charset=="")?(" charset=/"iso-8859-1/""):(" charset=/"" + Charset.ToLower() + "/"")) + ENTER);
SendBufferstrBuilder.Append("Content-Transfer-Encoding: base64" + ENTER + ENTER);
SendBufferstrBuilder.Append(Base64Encode(body) + ENTER);
}
//SendBufferstr += "Content-Transfer-Encoding: base64"+ENTER;
if(attachments != null && attachments.Count!=0)
{
for(int i=0;i<attachments.Count;i++)
{
string filepath = (string)attachments[i];
SendBufferstrBuilder.Append("--====="+ (isHtml?"001_Dragon520636771063_":"001_Dragon303406132050_") +"====="+ENTER);
//SendBufferstr += "Content-Type: application/octet-stream"+ENTER;
SendBufferstrBuilder.Append("Content-Type: text/plain;"+ENTER);
SendBufferstrBuilder.Append(" name=/"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("//")+1))+"?=/""+ENTER);
SendBufferstrBuilder.Append("Content-Transfer-Encoding: base64"+ENTER);
SendBufferstrBuilder.Append("Content-Disposition: attachment;"+ENTER);
SendBufferstrBuilder.Append(" filename=/"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("//")+1))+"?=/""+ENTER+ENTER);
SendBufferstrBuilder.Append(GetStream(filepath)+ENTER+ENTER);
}
SendBufferstrBuilder.Append("--====="+ (isHtml?"001_Dragon520636771063_":"001_Dragon303406132050_") +"=====--"+ENTER+ENTER);
}
SendBufferstrBuilder.Append(ENTER + "." + ENTER);
SendBufferstr = SendBufferstrBuilder.ToString();
if(!Dialog(SendBufferstr,_NetworkStream))
return false;
SendBufferstr="QUIT" + ENTER;
if(!Dialog(SendBufferstr,_NetworkStream))
return false;
return true;
}
#endregion
#region
/*
/// <summary>
/// 添加一個密件收件人
/// </summary>
/// <param name="str">收件人地址</param>
public bool AddRecipientBCC(string str)
{
if(str==null||str.Trim()=="")
return true;
if(RecipientBCCNum<10)
{
RecipientBCC.Add(RecipientBCCNum,str);
RecipientBCCNum++;
return true;
}
else
{
m_logs.Append("錯誤：收件人過多");
return false;
}
}
/// <summary>
/// 添加一組密件收件人（不超過10個），參數爲字符串數組
/// </summary>
/// <param name="str">保存有收件人地址的字符串數組（不超過10個）</param>
public bool AddRecipientBCC(string[] str)
{
for(int i=0;i<str.Length;i++)
{
if(!AddRecipientBCC(str[i]))
{
return false;
}
}
return true;
}
*/
#endregion
}
/// <summary>
/// 郵件發送優先級
/// </summary>
public enum Priority
{
High,
Normal,
Low
}
#endregion
}