asp.net发送接受邮件以及附件，还配有乱码的解决方法代码,Asp.Net代码库,德仔网

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【Asp.Net】 asp.net发送接受邮件以及附件，还配有乱码的解决方法
作者:Dezai.CN / 发布于2013/3/8/ 1435
asp.net发送接受邮件以及附件，还配有乱码的解决方法

	发送邮件的代码如下：
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Web;
	using System.Web.UI;
	using System.Web.UI.WebControls;
	using jmail;
	using System.IO;
	using System.Net.Mail;
	using System.Net;
	using System.Net.Mime;
	public partial class getemail : System.Web.UI.Page
	{
	 protected void Page_Load(object sender, EventArgs e)
	 {
	 }
	 protected void sendEmail_Click(object sender, EventArgs e)
	 {
	 #region
	 SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587);
	
	 smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
	 smtpClient.Credentials = new NetworkCredential("likeshan168@gmail.com", "likeshannihao168");
	 MailMessage mail = new MailMessage("likeshan168@gmail.com", emailRec.Text.Trim());
	 mail.Subject = subject.Text.Trim();
	 mail.SubjectEncoding = System.Text.Encoding.UTF8;
	 mail.Body = emailbody.Text.Trim();
	 mail.BodyEncoding = System.Text.Encoding.UTF8;
	 smtpClient.EnableSsl = true;
	 string attafile = fileUpload.PostedFile.FileName;
	 if (!string.IsNullOrEmpty(attafile))//这里是添加附件的作用
	 {
	 #region//方法一
	 //string filename = Path.GetFileName(attafile);
	 //fileUpload.PostedFile.SaveAs(Server.MapPath(filename));
	 //System.Net.Mail.Attachment atta = new System.Net.Mail.Attachment(Server.MapPath(filename));
	 //mail.Attachments.Add(atta);
	 #endregion
	 #region//方法二

	 //string filepath = Server.MapPath("~/UploadFile/Files");
	 //string extName = Path.GetExtension(attafile);
	 //if (!Directory.Exists(filepath))
	 //{
	 // Directory.CreateDirectory(filepath);
	 //}
	 //filepath = filepath + "\" + DateTime.Now.ToString("yyyyMMddhhMMssffff") + extName;
	 //fileUpload.PostedFile.SaveAs(filepath);

	 //System.Net.Mail.Attachment atta = null;
	 //if (extName == ".zip" || extName == ".rar")
	 //{
	 // atta = new System.Net.Mail.Attachment(filepath, MediaTypeNames.Application.Zip);
	 //}
	 //else
	 //{
	 // atta = new System.Net.Mail.Attachment(filepath, MediaTypeNames.Application.Octet);
	 //}
	
	
	 #endregion
	 #region//方法三
	 string filepath = Server.MapPath("~/UploadFile/Files");
	 string extName = Path.GetExtension(attafile);
	 if (!Directory.Exists(filepath))
	 {
	 Directory.CreateDirectory(filepath);
	 }
	 filepath = filepath + "\" + DateTime.Now.ToString("yyyyMMddhhMMssffff") + extName;
	 fileUpload.PostedFile.SaveAs(filepath);

	 System.Net.Mail.Attachment atta = null;
	 if (extName == ".zip" || extName == ".rar")
	 {
	 atta = new System.Net.Mail.Attachment(new FileStream(filepath, FileMode.Open, FileAccess.Read), attafile, MediaTypeNames.Application.Zip);
	 }
	 else
	 {
	 atta = new System.Net.Mail.Attachment(new FileStream(filepath, FileMode.Open, FileAccess.Read), attafile, MediaTypeNames.Application.Octet);
	 }
	 mail.Attachments.Add(atta);
	 #endregion
	 }
	 mail.Priority = MailPriority.Normal;
	 try
	 {
	 smtpClient.Send(mail);
	 ClientScript.RegisterClientScriptBlock(Page.GetType(), "tip1", "alert('发送成功！')", true);
	 }
	 catch (Exception ex)
	 {
	 ClientScript.RegisterClientScriptBlock(Page.GetType(), "tip2", "alert('" + ex.Message + "！')", true);
	 }
	 #endregion
	 }
	}
	接受邮件的代码
	<%@ WebHandler Language="C#" Class="getEmail" %>

	using System;
	using System.Web;
	using jmail;
	using System.Text;
	public class getEmail : IHttpHandler
	{

	 public void ProcessRequest(HttpContext context)
	 {
	 //context.Response.ContentType = "text/plain";
	 POP3Class popClient = new POP3Class();
	 try
	 {
	 popClient.Connect("likeshan168@163.com", "likeshannihao168", "pop.163.com", 110);
	 if (popClient != null)
	 {
	 if (popClient.Count > 0)//收件数目
	 {
	 StringBuilder sb = new StringBuilder();
	 Message msg = null;
	 for (int i = 0, len = popClient.Count; i < len; i++)
	 {
	 msg = popClient.Messages[i + 1];
	 string msgid = popClient.GetMessageUID(i + 1);//029DCA8D131AA92586C8FB6CB61B627B0E00000000000001(邮件在服务器中的唯一标识)
	 int c = popClient.GetLastUnreadMessage();
	 msg.ISOEncodeHeaders = false;
	 sb.Append("时间：" + msg.Date.ToString() + "");
	 sb.Append("发件人：" + msg.From + "");
	 string substr = msg.Headers.GetHeader("Subject");//只要有中文就会进行base64的编码，如果是英文的话，就不会进行base64的编码
	 if (substr.Contains("utf-8"))
	 {
	 substr = DecodeStr(substr.Split('?')[3], "utf-8");//=?utf-8?B?5pyJ5LiA5Liq5rWL6K+V?=
	 }
	 if (substr.Contains("gbk") || substr.Contains("GBK") || substr.Contains("GB2312"))
	 {
	 substr = DecodeStr(substr.Split('?')[3], "gbk");
	 }

	 sb.Append("主题：" + substr + "");
	 sb.Append("内容：" + msg.Body + "");
	 int attaCount = msg.Attachments.Count;
	 for (int j = 0; j < attaCount; j++)
	 {
	 sb.Append("附件(" + (j + 1).ToString() + ")：" + msg.Attachments[j].Name + "");

	 }
	 }
	 context.Response.Write(sb.ToString());
	 }
	 }
	 }
	 catch (Exception ex)
	 {
	 context.Response.Write(ex.Message);
	 }
	 }

	 public bool IsReusable
	 {
	 get
	 {
	 return false;
	 }
	 }
	
	 public static string base64GbkDecode(string data)
	 {
	 string decode = "";
	 byte[] bytes = Convert.FromBase64String(data);//先经过base64解码，在经过gbk2312解码
	 try
	 {
	 decode = Encoding.GetEncoding("gb2312").GetString(bytes);
	 }
	 catch (Exception ex1)
	 {
	 return "Error in base64Encode" + ex1.Message;
	 }
	 return decode;
	 }

	 public static string base64Utf8Decode(string data)
	 {
	 string result = "";
	 try
	 {
	 System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
	 System.Text.Decoder utf8Decode = encoder.GetDecoder();//获取解码器
	 byte[] todecode_byte = Convert.FromBase64String(data);//先经过base64解码，在经过utf-8解码
	 int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);//多少个字符
	 char[] decoded_char = new char[charCount];//字符字符数组
	 utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);//解码到字符数组
	 result = new String(decoded_char);
	 }
	 catch (Exception e)
	 {
	 return "Error in base64Encode" + e.Message;
	 }
	 return result;
	 }

	 //base64解码
	 public static string DecodeStr(string allstr, string code)
	 {
	 //形如=?...?=是结束开始的标志
	 //=?utf-8?B?5rWL6K+V5o6l5pS25pys6YKu5Lu26L+Z5piv5Li76aKY?=
	 //=?gbk?B?suLK1L3TytXN4rK/08q8/tXiuPbKx9b3zOU=?=
	 //返回的字符串
	 string str = "";
	 if (code == "gbk")
	 {
	 str = base64GbkDecode(allstr);
	 }
	 else if (code == "utf-8")
	 {
	 str = base64Utf8Decode(allstr);
	 }
	 return str;
	 }
	 // string subjectStr = popMail.Messages[i].Headers.GetHeader("Subject");
	 //subjectstr = DecodeStr(subjectallstr.Split('?')[3], &ldquo;utf-8&rdquo;);
	 //再次申明下一定要用popMail.Messages[i].Headers.GetHeader(&ldquo;Subject&rdquo;)的形式，
	 //如果原来页面用的是UTF-8编码popMail.Messages[i].Subject得到的将是直接经jmail解码后的乱码
	}
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