// 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 類中進(jìn)行用戶名、密碼的轉(zhuǎn)碼工作 */ private String toBASE64(String str) { return (new sun.misc.BASE64Encoder().encode(str.getBytes()));  }}// 簡單的郵件發(fā)送端類，實現(xiàn)發(fā)送功能public class SimpleMailSender { private String smtpServer; private int port = 25; private Socket socket; BufferedReader br; PrintWriter pw;  /** * 根據(jù)發(fā)件人的郵箱地址確定SMTP郵件服務(wù)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);  // 開始組裝發(fā)送郵件的命令序列 send_Receive(null); // 接收連接SMTP服務(wù)器成功的信息 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(nèi)容 pw.println("from:" + email.from); pw.println("to:" + email.to); // 主題與正文之間一定要空一行，即加上"/r/n" pw.println("subject:" + email.subject + "/r/n");  // 在控制臺打印郵件內(nèi)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);  // 郵件正文 pw.println(email.content);  // 一定記得正文以"."結(jié)束 send_Receive("."); send_Receive("quit"); } catch (IOException e) { e.printStackTrace(); } finally { try { if (socket != null)  socket.close(); } catch (IOException e) { e.printStackTrace(); } } }  /** * 每發(fā)送一條命令，必須在命令后面加上"/r/n", * 則同時打印出smtp郵件服務(wù)器的相應(yīng)狀態(tài)碼 * @param command */ private void send_Receive(String command) throws IOException{ if(command != null) { // 向SMTP郵件服務(wù)器發(fā)送命令，一定要記得加上"/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); } /** * 獲取 Socket 的輸出流 */ private PrintWriter getWriter(Socket socket) throws IOException { OutputStream socketOut = socket.getOutputStream(); return new PrintWriter(socketOut, true); } /** * 獲取 Socket 的輸入流 */ 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(fā)送程序界面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(fā)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("密碼："); 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("郵件正文："); this.contentArea = new JTextArea(15, 20); this.setTitle("螞蟻-->簡單郵件發(fā)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(fā)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); } }}