C#笔记8——多功能电子邮件发送程序实例
最近需要使用C#发邮件的功能，利用QQ邮件服务器发送邮件，包含发送邮件功能，MD5加密解密功能，自动加载、保存用户信息功能，非常适用于项目中的一些小功能！
效果图如下：
发送邮件
邮箱接收情况
源代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
//for send mail
using System.Net.Mail;
using System.Net;
using System.Threading;
using System.Text.RegularExpressions;
//for RD、WR
using System.IO;
//for Json
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
//for MD5
using System.Security.Cryptography;
namespace MyEmail
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btn_send_Click(object sender, EventArgs e)
{
if (tb_sender_addr.Text == "")
{
MessageBox.Show("发件人邮箱地址不能为空！\n");
return;
}
else
{
if (!MatchEmailAddr(tb_sender_addr.Text))
{
MessageBox.Show("发件人邮箱格式不正确，请重新输入！");
tb_sender_addr.Clear();
return;
}
}
if (tb_sender_pwd.Text == "")
{
MessageBox.Show("发件人邮箱密码不能为空！\n");
return;
}
if (tb_receiver_addr.Text == "")
{
MessageBox.Show("收件人邮箱地址不能为空!\n");
return;
}
else
{
if (!MatchEmailAddr(tb_receiver_addr.Text))
{
MessageBox.Show("收件人邮箱格式不正确，请重新输入！");
tb_receiver_addr.Clear();
return;
}
}
if (tb_theme.Text == "")
{
MessageBox.Show("邮件主题不能为空！");
return;
}
if (rtb_content.Text == "")
{
DialogResult dr1 = MessageBox.Show("请选择是否发送！\n", "邮件内容为空！", MessageBoxButtons.YesNo);
if (dr1 == DialogResult.Yes)
{
send_email(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);
}
else if (dr1 == DialogResult.No)
{
lab_log.Text = GetCurrentTime() + " 内容为空，取消发送!";
return;
}
else
{
return;
}
}
else
{
send_email(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);
}
}
private void btn_exit_Click(object sender, EventArgs e)
{
SaveUserMessage(tb_sender_addr.Text,tb_receiver_addr.Text,tb_sender_pwd.Text,tb_theme.Text,rtb_content.Text);
//关闭与该程序相关所有线程
System.Environment.Exit(System.Environment.ExitCode);
}
private void Form1_Load(object sender, EventArgs e)
{
LoadUserMessage();
}
#region send mail
//参数说明：发件人地址，收件人地址，发件人邮箱密码，邮件主题，邮件内容
private void send_email(string email_sender_addr, string email_receiver_addr, string email_sender_pwd, string email_subject, string email_content)
{
//使用QQ邮件服务器发送邮件
try
{
SmtpClient smtp = new SmtpClient();
smtp.EnableSsl = true;
smtp.UseDefaultCredentials = false;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式
smtp.Host = "smtp.qq.com";//指定SMTP服务器
smtp.Credentials = new NetworkCredential(email_sender_addr, email_sender_pwd);//发件人邮箱地址和密码
#region 邮件内容
MailMessage MyMail = new MailMessage(email_sender_addr, email_receiver_addr);//发件人和收件人
/*
MailMessage MyMail = new MailMessage();
MyMail.From = new MailAddress("690605677@qq.com");
MyMail.To.Add(new MailAddress(email_addr));
以上等价于MailMessage MyMail = new MailMessage(email_sender_addr,email_receiver_addr);
*/
MyMail.Subject = email_subject;
MyMail.SubjectEncoding = Encoding.UTF8;
MyMail.Body = email_content;
MyMail.BodyEncoding = Encoding.UTF8;
MyMail.IsBodyHtml = true;
MyMail.Priority = MailPriority.Low;
#endregion
smtp.Send(MyMail);
lab_log.Text = GetCurrentTime() + " 发送邮件成功！";
}
catch (Exception e)
{
MessageBox.Show("发送邮件出错：\n" + e.ToString());
lab_log.Text = GetCurrentTime() + " 发送邮件出错！";
return;
}
}
#endregion
//获取当前时间
private string GetCurrentTime()
{
string ct = null;
DateTime dt = new System.DateTime();
dt = System.DateTime.Now;
ct = dt.ToString();
return ct;
}
//匹配邮箱地址
private bool MatchEmailAddr(string EmailAddr)
{
bool EmailStatus = false;
//正则表达式字符串
string emailStr = @"([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,5})+";
//邮箱正则表达式对象
Regex emailReg = new Regex(emailStr);
if (emailReg.IsMatch(EmailAddr.Trim()))
{
EmailStatus = true; ;
}
else
{
lab_log.Text = "输入的不是有效的邮件地址格式";
EmailStatus = false;
}
return EmailStatus;
}
//保存用户信息
private void SaveUserMessage(string email_sender_addr, string email_receiver_addr, string email_sender_pwd, string email_subject, string email_content)
{
try {
if (!File.Exists("./UserMsg.txt"))
{
FileStream fs = File.Create("./UserMsg.txt");
fs.Close();
StreamWriter sw = new StreamWriter("./UserMsg.txt", false, System.Text.Encoding.GetEncoding("utf-8"));
string content = GetUserMsg_json(tb_sender_addr.Text, tb_sender_pwd.Text, tb_receiver_addr.Text, tb_theme.Text, rtb_content.Text);
sw.WriteLine(content);
sw.Close();
sw.Dispose();
}
else
{
StreamWriter sw = new StreamWriter("./UserMsg.txt", false, System.Text.Encoding.GetEncoding("utf-8"));
string content = GetUserMsg_json(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);
sw.WriteLine(content);
sw.Close();
sw.Dispose();
}
}
catch {
lab_log.Text = GetCurrentTime() + " 保存用户信息出错！";
}
}
//加载用户信息
private void LoadUserMessage()
{
if (File.Exists("./UserMsg.txt"))
{
StreamReader sw = new StreamReader("./UserMsg.txt", System.Text.Encoding.GetEncoding("utf-8"), false);
string str = null;
str = sw.ReadToEnd();
//MessageBox.Show("read:\n" + str);
sw.Close();
sw.Dispose();
try
{
JObject job = new JObject();
job = JObject.Parse(str);
this.tb_sender_addr.Text = job["sender_addr"].ToString();
this.tb_receiver_addr.Text = job["receiver_addr"].ToString();
this.tb_sender_pwd.Text = MD5Decrypt(job["sender_pwd"].ToString());
this.tb_theme.Text = job["subject"].ToString();
this.rtb_content.Text = job["content"].ToString();
}
catch
{
lab_log.Text = GetCurrentTime() + " 加载用户信息失败！";
}
}
}
//将用户信息转为Json数据
private string GetUserMsg_json(string email_sender_addr, string email_receiver_addr, string email_sender_pwd, string email_subject, string email_content)
{
string retmsg = null;
try {
JObject job = new JObject();
job.Add(new JProperty("sender_addr",email_sender_addr));
job.Add(new JProperty("receiver_addr", email_receiver_addr));
job.Add(new JProperty("sender_pwd", MD5Encrypt(email_sender_pwd)));
job.Add(new JProperty("subject", email_subject));
job.Add(new JProperty("content", email_content));
retmsg = job.ToString();
}
catch
{
lab_log.Text = GetCurrentTime() + " Json 数据出错！";
}
return retmsg;
}
//MD5加密
private string MD5Encrypt(string data)
{
string retmsg = null;
string KEY_64 = "VavicApp";
string IV_64 = "VavicApp";
try
{
byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
int i = cryptoProvider.KeySize;
MemoryStream ms = new MemoryStream();
CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);
StreamWriter sw = new StreamWriter(cst);
sw.Write(data);
sw.Flush();
cst.FlushFinalBlock();
sw.Flush();
retmsg = Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
sw.Close();
}
catch (Exception x)
{
MessageBox.Show("MD5 加密出错:\n"+x.Message);
lab_log.Text = GetCurrentTime() + " MD5 加密出错！";
}
return retmsg;
}
//MD5解密
private string MD5Decrypt(string data)
{
string retmsg = null;
string KEY_64 = "VavicApp";
string IV_64 = "VavicApp";
try
{
byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
byte[] byEnc;
byEnc = Convert.FromBase64String(data); //把需要解密的字符串转为8位无符号数组
DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
MemoryStream ms = new MemoryStream(byEnc);
CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cst);
retmsg = sr.ReadToEnd();
sr.Close();
}
catch (Exception x)
{
MessageBox.Show("MD5 解密出错误：\n"+x.Message);
lab_log.Text = GetCurrentTime() + " MD5 解密出错误!";
}
return retmsg;
}
//关闭窗口事件
private void FormCloseingAll(object sender, FormClosingEventArgs e)
{
SaveUserMessage(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);
//关闭所有线程
System.Environment.Exit(System.Environment.ExitCode);
}
}
}
(用gmail测试ok)都可以发送邮件的，所以使用的时候需要注意一下！一般的邮箱服务都只为自己的用户提供服务，所以非QQ邮箱是无法登陆到QQ邮箱客户端查看邮件信息的，更别说借用其服务发邮件了！
如果想实现任意邮箱发送的功能，可以指定多个SMTP服务器（smtp.Host = "smtp.qq.com";//指定SMTP服务器）和对应的发送方式，发送之前根据邮箱地址判断邮箱类型，然后使用对应的SMTP服务就可以了,当然前提是你需要知道那么多的SMTP服务器地址，而且它们都对外开放了相应的接口才行！如果有兴趣的话可以试着做一下！
