<!-- Maven 依赖 -->
   <dependency>
       <groupId>com.sun.mail</groupId>
       <artifactId>javax.mail</artifactId>
       <version>1.6.2</version>
   </dependency>
   <dependency>
       <groupId>javax.activation</groupId>
       <artifactId>activation</artifactId>
       <version>1.1.1</version>
   </dependency>

   import javax.mail.*;
   import javax.mail.internet.InternetAddress;
   import javax.mail.internet.MimeMessage;
   import java.util.Properties;

   public class EmailSender {
       public static void main(String[] args) {
           // 1. 设置邮件发送相关属性
           Properties properties = new Properties();
           properties.put("mail.smtp.host", "smtp.example.com");
           properties.put("mail.smtp.port", "587");
           properties.put("mail.smtp.auth", "true");
           properties.put("mail.smtp.starttls.enable", "true");

           // 2. 创建会话对象
           Session session = Session.getInstance(properties, new Authenticator() {
               @Override
               protected PasswordAuthentication getPasswordAuthentication() {
                   return new PasswordAuthentication("your_email@example.com", "your_password");
               }
           });

           try {
               // 3. 创建邮件消息
               Message message = new MimeMessage(session);
               message.setFrom(new InternetAddress("your_email@example.com"));
               message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("recipient@example.com"));
               message.setSubject("Test Email");
               message.setText("This is a test email from Java.");

               // 4. 发送邮件
               Transport.send(message);

               System.out.println("Email sent successfully!");

           } catch (MessagingException e) {
               e.printStackTrace();
           }
       }
   }