java編寫簡略的E-mail發送端法式。本站提示廣大學習愛好者:(java編寫簡略的E-mail發送端法式)文章只能為提供參考,不一定能成為您想要的結果。以下是java編寫簡略的E-mail發送端法式正文
本文實例引見了簡略E-mail發送端法式的Java完成代碼,分享給年夜家供年夜家參考,詳細內容以下
在這個代碼中,有幾個留意點強調一下:
1、應用 Socket 與 SMTP 郵件辦事器獲得銜接,留意 SMTP 辦事器的主機名;
2、應用 data 敕令時,若寫了 subject (主題)以後,郵件的注釋部門必需與 subject 之間有一個空行,即“回車+換行”,在代碼中則是 \r\n ;
3、異樣須要將發件人的郵箱用戶名、暗碼停止 BASE64 編碼以後再傳給 SMTP 辦事器;
4、法式在編譯時依然存在正告,這是因為 sun.misc.BASE64Encoder 類是存在於 rt.jar 包中的,因為 JDK 會更新進級,能夠會招致該包中的某些類產生變更而弗成用,所以編譯器會收回正告。
另外,寫了這些代碼,也發明了一些成績:
1、smtp.qq.com 和 smtp.sina.com 郵件辦事器不曉得為何不克不及用,也就是說,當發件人的郵箱地址是 qq 或許 sina 時,這個法式不論用了,狀況應對碼也看不懂。在我的測試傍邊,只要 smtp.163.com 可以用,明明都是在官網查到這幾個 SMTP 辦事器的,怎樣不克不及用呢?真奇異。有哪位同伙曉得的願望能告知我,感謝!
2、鄙人面的 SimpleMailSender 類中的 sendEmail() 辦法中,有些反復代碼讓人覺得困惑,然則沒方法,我臨時還弄不懂…
3、嚴重發明:QQ 郵箱吸收郵件的速度比 163 郵箱、sina 郵箱要快上能夠稀有十倍,真讓我驚奇。另外,應用 nslookup 敕令查詢 smtp.qq.com 的主機名時,發明它有很多多少台 SMTP 辦事器,至多比 163 的 3 台多出 5 台,騰訊真夠壯大;
4、固然說寫了這個法式可以歹意地一直給某個郵箱發郵件,然則我發明,當我用一個 sina 郵箱持續發送了幾十封郵件給固定的另外一個郵箱以後,該 sina 郵箱再想發郵件就會被謝絕,當心喲。
代碼以下:
// 郵件 class E_Mail { String from; String to; String subject; String content; String userName; String pwd; public E_Mail(String from, String to, String subject, String content, String userName, String pwd) { this.from = from; this.to = to; this.subject = subject; this.content = content; this.userName = this.toBASE64(userName); this.pwd = this.toBASE64(pwd); } /** * 在 E_Mail 類中停止用戶名、暗碼的轉碼任務 */ private String toBASE64(String str) { return (new sun.misc.BASE64Encoder().encode(str.getBytes())); } } // 簡略的郵件發送端類,完成發送功效 public class SimpleMailSender { private String smtpServer; private int port = 25; private Socket socket; BufferedReader br; PrintWriter pw; /** * 依據發件人的郵箱地址肯定SMTP郵件辦事器 */ private void initServer(String from) { if(from.contains("@163")) { this.smtpServer = "smtp.163.com"; }else if(from.contains("@126")) { this.smtpServer = "smtp.126.com"; }else if(from.contains("@sina")) { this.smtpServer = "smtp.sina.com"; }else if(from.contains("@qq")) { this.smtpServer = "smtp.qq.com"; } } public void sendEmail(E_Mail email) { try { this.initServer(email.from); this.socket = new Socket(smtpServer, port); this.br = this.getReader(socket); this.pw = this.getWriter(socket); // 開端組裝發送郵件的敕令序列 send_Receive(null); // 吸收銜接SMTP辦事器勝利的信息 send_Receive("ehlo hao"); send_Receive("auth login"); send_Receive(email.userName); send_Receive(email.pwd); send_Receive("mail from:<" + email.from + ">"); send_Receive("rcpt to:<" + email.to + ">"); send_Receive("data"); // 郵件內容 pw.println("from:" + email.from); pw.println("to:" + email.to); // 主題與注釋之間必定要空一行,即加上"\r\n" pw.println("subject:" + email.subject + "\r\n"); // 在掌握台打印郵件內容 System.out.println("from:" + email.from); System.out.println("to:" + email.to); System.out.println("subject:" + email.subject + "\r\n"); System.out.println(email.content); // 郵件注釋 pw.println(email.content); // 必定記得注釋以"."停止 send_Receive("."); send_Receive("quit"); } catch (IOException e) { e.printStackTrace(); } finally { try { if (socket != null) socket.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 每發送一條敕令,必需在敕令前面加上"\r\n", * 則同時打印出smtp郵件辦事器的響應狀況碼 * @param command */ private void send_Receive(String command) throws IOException{ if(command != null) { // 向SMTP郵件辦事器發送死令,必定要記得加上"\r\n" pw.print(command + "\r\n"); pw.flush(); System.out.println("用戶 >> " + command); } char [] response = new char[1024]; br.read(response); System.out.println(response); } /** * 獲得 Socket 的輸入流 */ private PrintWriter getWriter(Socket socket) throws IOException { OutputStream socketOut = socket.getOutputStream(); return new PrintWriter(socketOut, true); } /** * 獲得 Socket 的輸出流 */ private BufferedReader getReader(Socket socket) throws IOException { InputStream socketIn = socket.getInputStream(); return new BufferedReader(new InputStreamReader(socketIn)); } // 測試 public static void main(String[] args) { new MailSenderGUI(); } } // 郵件發送法式界面 class MailSenderGUI extends JFrame implements ActionListener { private JLabel userNameLabel; private JTextField userNameField; private JLabel pwdLabel; private JPasswordField pwdField; private JLabel fromLabel; private JTextField fromField; private JLabel toLabel; private JTextField toField; private JLabel subjectLabel; private JTextField subjectField; private JLabel contentLabel; private JTextArea contentArea; private JButton sendBtn; private JButton cancelBtn; private E_Mail email; private SimpleMailSender mailSender; public MailSenderGUI() { this.init(); this.mailSender = new SimpleMailSender(); } private void init() { this.fromLabel = new JLabel("發件人郵箱地址:"); this.fromField = new JTextField(25); this.userNameLabel = new JLabel("用戶名:"); this.userNameField = new JTextField(25); this.pwdLabel = new JLabel("暗碼:"); this.pwdField = new JPasswordField(25); this.toLabel = new JLabel("收件人郵箱地址:"); this.toField = new JTextField(25); this.subjectLabel = new JLabel("郵件主題:"); this.subjectField = new JTextField(20); this.contentLabel = new JLabel("郵件注釋:"); this.contentArea = new JTextArea(15, 20); this.setTitle("螞蟻-->簡略郵件發送器"); this.setBounds(200, 30, 500, 500); this.setLayout(new BorderLayout()); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); this.sendBtn = new JButton("發送"); this.cancelBtn = new JButton("重置"); this.sendBtn.addActionListener(this); this.cancelBtn.addActionListener(this); JPanel upPanel = new JPanel(new GridLayout(6, 2, 5, 5)); upPanel.add(fromLabel); upPanel.add(fromField); upPanel.add(userNameLabel); upPanel.add(userNameField); upPanel.add(pwdLabel); upPanel.add(pwdField); upPanel.add(toLabel); upPanel.add(toField); upPanel.add(subjectLabel); upPanel.add(subjectField); upPanel.add(contentLabel); this.add(upPanel, BorderLayout.NORTH); this.add(contentArea, BorderLayout.CENTER); JPanel downPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); downPanel.add(sendBtn, BorderLayout.SOUTH); downPanel.add(cancelBtn, BorderLayout.SOUTH); this.add(downPanel, BorderLayout.SOUTH); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == this.sendBtn) { this.email = new E_Mail( this.fromField.getText(), this.toField.getText(), this.subjectField.getText(), this.contentArea.getText(), this.userNameField.getText(), new String(this.pwdField.getPassword()) ); this.mailSender.sendEmail(this.email); } else if (e.getSource() == this.cancelBtn) { this.fromField.setText(null); this.toField.setText(null); this.subjectField.setText(null); this.contentArea.setText(null); } } }
以上就是java編寫簡略E-mail發送端法式的全體代碼,願望對年夜家的進修有所贊助。