電子郵件的傳送與接收例項
阿新 • • 發佈：2019-02-06
這個就不寫很多不同類的屬性和方法了。其中涉及的類有MailMessage類，SmtpClient類
其實可有還有相關的Attachment類：表示電子郵件的附件
以下是我看的一本書中的例項，我也就直接貼例項程式碼了：
一共三個窗體：Form1,frmSend,frmReceive
首先是Form1窗體：
後臺程式碼：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace EmailSendAndReceive { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void 郵件傳送ToolStripMenuItem_Click(object sender, EventArgs e) { frmSend frmsend = new frmSend(); frmsend.MdiParent = this; frmsend.Show(); } private void 郵件接收ToolStripMenuItem_Click(object sender, EventArgs e) { frmReceive frmreceive = new frmReceive(); frmreceive.MdiParent = this; frmreceive.Show(); } } }
其次是郵件傳送窗體：
後臺程式碼：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Net; using System.Net.Mail; namespace EmailSendAndReceive { public partial class frmSend : Form { public frmSend() { InitializeComponent(); } //對郵件內容進行編碼 public static string Base64Encode(string str) { return Convert.ToBase64String(Encoding.UTF8.GetBytes(str)); } private void btnSend_Click(object sender, EventArgs e) { try { MailAddress from = new MailAddress(txtSend.Text); //設定郵件傳送人 MailAddress to = new MailAddress(txtTo.Text); //設定郵件接收人 MailMessage message = new MailMessage(from, to); //例項化一個MaileMessage類物件 message.Subject = Base64Encode(txtSubject.Text); //設定傳送郵件的主題 message.Body = Base64Encode(txtContent.Text); //設定傳送郵件的內容 //例項化SmtpClient郵件傳送類物件 SmtpClient client = new SmtpClient(txtServer.Text, Convert.ToInt32(txtPort.Text)); //設定用於驗證發件人身份的憑據 client.Credentials = new System.Net.NetworkCredential(txtName.Text, txtPwd.Text); //傳送郵件 client.Send(message); MessageBox.Show("傳送成功"); } catch { MessageBox.Show("傳送失敗!"); } } } }
最後是郵件接收窗體：
後臺程式碼：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Net; using System.Net.Sockets; using System.IO; namespace EmailSendAndReceive { public partial class frmReceive : Form { public frmReceive() { InitializeComponent(); } public static string strserver; //儲存郵件伺服器 public static string pwd; //儲存使用者登入郵箱的密碼 public static int k; //儲存郵件數目 public static TcpClient tcpclient; //例項化TcpClient物件，用來建立客戶端連線 public static StreamReader sreader; //通過流讀取郵件內容 public static string strRet; //儲存郵件內容 //向伺服器傳送命令 private string SendPopCmd(TcpClient tcpclient, string strCmd) { Byte[] arrCmd; string strRet; Stream stream; stream = tcpclient.GetStream(); strCmd = strCmd + "\r\n"; arrCmd = Encoding.Default.GetBytes(strCmd.ToCharArray()); stream.Write(arrCmd, 0, strCmd.Length); strRet = sreader.ReadLine(); return strRet; } //該方法用來對獲得連線的使用者身份進行驗證 private string Logon(TcpClient tcpclient, string user, string pass) { string strRet; //儲存使用者登入資訊 strRet = SendPopCmd(tcpclient, "user " + user); //向登入伺服器傳送使用者名稱 strRet = SendPopCmd(tcpclient, "pass " + pass); //想登入伺服器傳送密碼 return strRet; } //獲取登入郵箱的各種資訊 private string[] StaticMailBox(TcpClient tcpclient) { string strRet; strRet = SendPopCmd(tcpclient, "stat"); //向伺服器傳送資訊返回郵箱的統計資料 if (JudgeString(strRet) != "+OK") { return "-ERR -ERR".Split(" ".ToCharArray()); } else { string[] arrRet = strRet.Split(" ".ToCharArray()); return arrRet; } } //判斷返回的字串資訊，如果是“+OK”，證明登入成功，否則登入失敗 private string JudgeString(string strCheck) { if (strCheck.Substring(0, 3) != "+OK") { return "-ERR"; } else return "+OK"; } //根據輸入的郵件編號讀取郵件資訊 private string[] PopMail(TcpClient tcpclient, int i) { string strRet; string[] arrRet = new string[20]; bool strBody = false; string[] arrTemp; //獲取由引數標識的郵件的全部文字 strRet = SendPopCmd(tcpclient, "retr " + i.ToString()); if (JudgeString(strRet) != "+OK") { return "-ERR -ERR".Split(" ".ToCharArray()); } arrRet[0] = "+OK"; while (sreader.Peek() != 46) { strRet = sreader.ReadLine(); arrTemp = strRet.Split(":".ToCharArray()); if (strRet == "") strBody = true; //現在開始接收 Body 的資訊 if (arrTemp[0].ToLower() == "date") arrRet[1] = arrTemp[1]; //信件的傳送日期 if (arrTemp[0].ToLower() == "from") arrRet[2] = (arrTemp[1].Substring(arrTemp[1].LastIndexOf("<") + 1)).Replace(">", " "); //發信人 if (arrTemp[0].ToLower() == "to") arrRet[3] = (arrTemp[1].Substring(arrTemp[1].LastIndexOf("<") + 1)).Replace(">", " "); //收信人 if (arrTemp[0].ToLower() == "subject") arrRet[4] = arrTemp[1].ToString(); //主題 if (strBody) arrRet[5] = arrRet[5] + strRet + "\n"; } return arrRet; } //對讀取的郵件內容進行Base64編碼 public static string Base64Decode(string str) { return Encoding.UTF8.GetString(Convert.FromBase64String(str)); } //“登入”按鈕事件 private void btnLogin_Click(object sender, EventArgs e) { string user = txtMail.Text; string pass = txtPwd.Text; string[] arrRet; pwd = pass; strserver = txtPOP.Text; tcpclient = new TcpClient(); try { tcpclient.Connect(strserver, 110); //連線遠端主機 //初始化StreamReader物件，以便以流的形式讀取遠端主機中的內容 sreader = new StreamReader(tcpclient.GetStream(), Encoding.Default); sreader.ReadLine(); strRet = Logon(tcpclient, user, pass); //登入遠端主機 if (JudgeString(strRet) != "+OK") { MessageBox.Show("使用者名稱或密碼不匹配"); return; } arrRet = StaticMailBox(tcpclient); //獲取遠端主機中指定使用者的郵件資訊 if (arrRet[0] != "+OK") { MessageBox.Show("出錯了！"); return; } richTextBox1.AppendText("當前使用者：" + user + "\n"); richTextBox1.AppendText("郵箱中共有：" + arrRet[1] + "封郵件" + "\n"); richTextBox1.AppendText("共佔：" + arrRet[2] + "Byte"); k = Convert.ToInt32(arrRet[1]); txtPOP.ReadOnly = txtMail.ReadOnly = txtPwd.ReadOnly = true; btnLogin.Enabled = false; btnReceive.Enabled = true; MessageBox.Show("登入成功！"); } catch { MessageBox.Show("連線伺服器失敗！"); } } //“退出”按鈕事件 private void btnExit_Click(object sender, EventArgs e) { tcpclient.Close(); //關閉遠端主機連線 } //“接收”郵件按鈕事件 private void btnReceive_Click(object sender, EventArgs e) { try { if (txtNum.Text != "") { if (Convert.ToInt32(txtNum.Text) > k || Convert.ToInt32(txtNum.Text) <= 0) { MessageBox.Show("輸入的索引錯誤"); } else { richTextBox1.Clear(); string[] arrRets; //獲得遠端主機上指定郵件的相關資訊，儲存到一個string型別的陣列中 arrRets = PopMail(tcpclient, Convert.ToInt32(txtNum.Text)); richTextBox1.AppendText("當前是第" + txtNum.Text + "封信" + "\n"); richTextBox1.AppendText("郵件日期：" + arrRets[1] + "\n"); richTextBox1.AppendText("發信人：" + arrRets[2] + "\n"); richTextBox1.AppendText("收信人：" + arrRets[3] + "\n"); richTextBox1.AppendText("郵件主題：" + Base64Decode(arrRets[4]) + "\n"); richTextBox1.AppendText("郵件內容：" + Base64Decode(arrRets[5])); } } else { MessageBox.Show("郵件索引錯誤"); } } catch { } } private void txtPwd_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) btnLogin.Focus(); } private void txtPOP_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) txtMail.Focus(); } private void txtMail_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) txtPwd.Focus(); } private void txtNum_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) btnReceive.Focus(); } private void frmReceive_FormClosed(object sender, FormClosedEventArgs e) { try { tcpclient.Close(); } catch { } } } }