呼之欲出 WebMail 开发手记 （五） 邮件操作类

这两天身体不是很舒服，来晚了，在此向大家谢罪。

本来准备就讲邮件收发了，突然发现好像一些基本的东西都还没有说呢。贴代码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;
using System.IO;

/**//***************************************
 ********  里奥特在线邮件收发系统  *****
 ***************************************/
namespace Lyout.WebMail {
    /**//// <summary>
    /// 功能:基本处理
    /// 编写:夏荣全
    /// 日期:2009-07-03
    /// </summary>
    public sealed class MailHelper {
        public static readonly string POP3Name = "__POP3MAIL__";
        public static readonly string SMTPName = "__SMTPMAIL__";

        public static string MakeFileName() {
            return DateTime.Now.ToString("yyyyMMddHHmmss");
        }

        DeleteFile#region DeleteFile
        /**//// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="filePath">文件全路径</param>
        public static bool DeleteFile(string filePath) {
            try {
                if (File.Exists(filePath)) {
                    File.Delete(filePath);
                }
                return true;
            }
            catch {
                return false;
            }
        }
        #endregion

        ParseDate#region ParseDate

        /**//// <summary>
        /// 获取邮件时间
        /// </summary>
        /// <param name="headers"></param>
        public static DateTime ParseDate(string date) {
            try {
                if (date.Length > 0) {
                    return ParseDateS(date);
                }
                else {
                    return DateTime.Now;
                }
            }
            catch {
                return DateTime.Now;
            }
        }

        /**//// <summary>
        /// Parses rfc2822 datetime.
        /// </summary>
        /// <param name="date">Date string</param>
        /// <returns></returns>
        public static DateTime ParseDateS(string date) {
            /**//*
            GMT  -0000
            EDT  -0400
            EST  -0500
            CDT  -0500
            CST  -0600
            MDT  -0600
            MST  -0700
            PDT  -0700
            PST  -0800
            */
            if (!string.IsNullOrEmpty(date)) {
                if (date.IndexOf("(") != -1) {
                    date = date.Substring(0, date.IndexOf("(") - 1);
                }

                date = date.Replace("GMT", "-0000");
                date = date.Replace("EDT", "-0400");
                date = date.Replace("EST", "-0500");
                date = date.Replace("CDT", "-0500");
                date = date.Replace("CST", "-0600");
                date = date.Replace("MDT", "-0600");
                date = date.Replace("MST", "-0700");
                date = date.Replace("PDT", "-0700");
                date = date.Replace("PST", "-0800");

                string[] formats = new string[]{
                    "f","F","g","G","r",
                    "d MMM yyyy HH':'mm':'ss",
                    "dd MMM yyyy HH':'mm':'ss",
                    "ddd, d MMM yyyy HH':'mm':'ss",
                    "ddd, dd MMM yyyy HH':'mm':'ss",
                    "d MMM yyyy HH':'mm':'ss zzz",
                    "dd MMM yyyy HH':'mm':'ss zzz",
                    "ddd, d MMM yyyy HH':'mm':'ss zzz",
                    "ddd, dd MMM yyyy HH':'mm':'ss zzz",
                    "d'-'MMM'-'yyyy HH':'mm':'ss zzz",
                    "dd'-'MMM'-'yyyy HH':'mm':'ss zzz"
                };
                try {
                    return DateTime.ParseExact(date.Trim(), formats, System.Globalization.DateTimeFormatInfo.InvariantInfo, System.Globalization.DateTimeStyles.None);
                }
                catch {
                    return DateTime.Now;
                }
            }
            else {
                return DateTime.Now;
            }
        }
        #endregion

        保存日志#region 保存日志
        public static void SaveLogs(string filePath, string text) {
            try {
                using (FileStream fs = new FileStream(filePath + DateTime.Now.ToString("yyyy-MM-dd") + ".log", FileMode.Append, FileAccess.Write, FileShare.ReadWrite)) {
                    byte[] bytes = System.Text.Encoding.Default.GetBytes(DateTime.Now.ToString("HH:mm:ss\t") + text + "\r\n");
                    fs.Write(bytes, 0, bytes.Length);
                }
            }
            catch {
            }
        }
        #endregion

        SetChecked#region SetChecked
        public static void SetChecked(string id, GridView grid, int cellIndex) {
            SetChecked(true, id, grid, cellIndex);
        }

        public static void SetChecked(bool Checked, string id, GridView grid, int cellIndex) {
            foreach (GridViewRow row in grid.Rows) {
                CheckBox checkbox = (CheckBox)row.Cells[cellIndex].FindControl(id);
                if (checkbox != null && checkbox.Enabled) {
                    checkbox.Checked = Checked;
                }
            }
        }
        #endregion

        GetString#region GetString
        public static string GetString(string sQueryValue, string sDefault) {
            if (!string.IsNullOrEmpty(sQueryValue) && sQueryValue != "") {
                return sQueryValue.Trim();
            }
            else {
                return sDefault;
            }
        }
        #endregion

        邮件头解码#region 邮件头解码
        public static string DecodeStr(string str) {
            if (!string.IsNullOrEmpty(str)) {
                string[] sArr = str.Split(new char[] { '?' });
                if (sArr.Length == 5) {
                    System.Text.Encoding enc = System.Text.Encoding.GetEncoding(sArr[1]);
                    if (sArr[2].ToUpper() == "B") {
                        return enc.GetString(Convert.FromBase64String(sArr[3]));
                    }
                    else if (sArr[2].ToUpper() == "Q") {
                        return QDecode(enc, sArr[3]);
                    }
                }
                return (str != "") ? str : "无主题";
            }
            else {
                return "无主题";
            }
        }

        /**//// <summary>
        /// quoted-printable decoder.
        /// </summary>
        /// <param name="encoding">Input string encoding.</param>
        /// <param name="data">String which to encode.</param>
        /// <returns></returns>
        public static string QDecode(System.Text.Encoding encoding, string data) {
            // ASCII
            MemoryStream strm = new MemoryStream(System.Text.Encoding.Default.GetBytes(data));
            int b = strm.ReadByte();

            MemoryStream dStrm = new MemoryStream();

            while (b > -1) {
                // Hex eg. =E4
                if (b == '=') {
                    byte[] buf = new byte[2];
                    strm.Read(buf, 0, 2);

                    // <CRLF> followed by =, it's splitted line
                    if (!(buf[0] == '\r' && buf[1] == '\n')) {
                        try {
                            int val = int.Parse(System.Text.Encoding.Default.GetString(buf), System.Globalization.NumberStyles.HexNumber);
                            //string encodedChar = encoding.GetString(new byte[] { (byte)val });
                            //byte[] d = System.Text.Encoding.Unicode.GetBytes(encodedChar);
                            byte[] d = new byte[] { (byte)val };
                            dStrm.Write(d, 0, d.Length);
                        }
                        catch { // If worng hex value, just skip this chars
                        }
                    }
                }
                else {
                    string encodedChar = encoding.GetString(new byte[] { (byte)b });
                    byte[] d = System.Text.Encoding.Default.GetBytes(encodedChar);
                    dStrm.Write(d, 0, d.Length);
                }

                b = strm.ReadByte();
            }
            return encoding.GetString(dStrm.ToArray());
            //return System.Text.Encoding.Unicode.GetString(dStrm.ToArray());
        }
        #endregion

        GetAddress#region GetAddress
        public static MailAddressCollection GetAddress(string strAddress) {
            int len = 0;
            return GetAddress(strAddress, ref len);
        }

        /**//// <summary>
        /// 分析邮件地址
        /// </summary>
        /// <param name="strAddress">邮件地址串如:"姓名" &lt;邮件地址&gt;</param>
        /// <param name="totalLength">总长度.用于计算邮件大小</param>
        /// <returns></returns>
        public static MailAddressCollection GetAddress(string strAddress, ref int totalLength) {
            MailAddressCollection addr = new MailAddressCollection();

            int newl = 0;
            if (!string.IsNullOrEmpty(strAddress)) {
                string[] addressList = strAddress.Trim().Split(new char[] { ',' });
                foreach (string address in addressList) {
                    int p = address.IndexOf("<");
                    if (p != -1) {
                        string displayName = address.Substring(0, p - 1).Trim();
                        displayName = displayName.Replace("\"", "");

                        string emailAddress = address.Substring(p + 1).Trim();
                        emailAddress = emailAddress.Replace(">", "");

                        try {
                            addr.Add(new MailAddress(emailAddress, displayName));
                        }
                        catch {
                        }

                        newl += displayName.Length + emailAddress.Length;
                    }
                    else {
                        try {
                            addr.Add(new MailAddress(address, address));
                        }
                        catch {
                        }
                    }
                }
            }

            totalLength = newl;
            return addr;
        }
        #endregion

        简单的字符串加密解密#region 简单的字符串加密解密
        //加密   
        public static string Encrypt(string data, string skey) {
            if (!string.IsNullOrEmpty(data) && data != "") {
                string encodestr = "";
                byte[] bytes = System.Text.Encoding.UTF8.GetBytes(data);
                try {
                    encodestr = Convert.ToBase64String(bytes);
                }
                catch {
                    encodestr = data;
                }
                return encodestr;
            }
            else {
                return "";
            }
        }

        //解密   
        public static string Decrypt(string data, string skey) {
            if (!string.IsNullOrEmpty(data) && data != "") {
                string decodestr = "";
                byte[] bytes = Convert.FromBase64String(data);
                try {
                    decodestr = System.Text.Encoding.UTF8.GetString(bytes);
                }
                catch {
                    decodestr = data;
                }
                return decodestr;
            }
            else {
                return "";
            }
        }
        #endregion
    }
}