以QQ郵箱為例

1.匯入jar包：##

<dependency>
  <groupId>javax.mail</groupId>
  <artifactId>mail</artifactId>
  <version>1.5.0-b01</version>
</dependency>

<dependency>
  <groupId>javax.activation</groupId>
  <artifactId>activation</artifactId>
  <version>1.1.1-redhat-1</version>
</dependency>
 

2. Servlet程式碼##

		// 收件人電子郵箱
        String to = **********@;
        
        // 發件人電子郵箱
        String from ="*******@qq.com";
        
        // 指定傳送郵件的主機為 smtp.qq.com
        String host = "smtp.qq.com";  //QQ 郵件伺服器
        
        // 獲取系統屬性
        Properties properties = System.getProperties();
        
        // 設定郵件伺服器
        properties.setProperty("mail.smtp.host", host);
        properties.put("mail.smtp.auth", "true");
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.ssl.socketFactory", sf);
        
        // 獲取預設session物件
        Session session = Session.getDefaultInstance(properties,new Authenticator(){
            public PasswordAuthentication getPasswordAuthentication()
            {
                return new PasswordAuthentication("********@qq.com", "gmcfo*****bcfg"); //發件人郵件使用者名稱、密碼(授權碼)
            }
        });

        try{
            // 建立預設的 MimeMessage 物件
            MimeMessage message = new MimeMessage(session);
            
            // Set From: 頭部頭欄位
            message.setFrom(new InternetAddress(from));
            
            // Set To: 頭部頭欄位
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            
            // Set Subject: 頭部頭欄位
            message.setSubject("來自南信院學生管理系統的啟用郵件");
         
            // 設定訊息體
            message.setContent("<h1>來自南信院學生管理系統的啟用郵件,不是本人操作請忽視此郵件，啟用請點選以下連結：</h1><h3><a href='http://localhost:8080/*****'>點我跳轉</a></h3>","text/html;charset=utf-8");
            
            // 傳送訊息
            Transport.send(message);
        }catch (MessagingException mex) {
            mex.printStackTrace();
        }