java 可以发送邮件的网页

Java可以通过JavaMail API发送邮件。以下是一个简单的Java程序，可以通过Gmail SMTP服务器发送电子邮件。

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendEmail {
   public static void main(String[] args) {
      final String username = "yourusername@gmail.com";
      final String password = "yourpassword";

      Properties props = new Properties();
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");
      props.put("mail.smtp.host", "smtp.gmail.com");
      props.put("mail.smtp.port", "587");

      Session session = Session.getInstance(props,
         new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
               return new PasswordAuthentication(username, password);
            }
         });

      try {
         Message message = new MimeMessage(session);
         message.setFrom(new InternetAddress("yourusername@gmail.com"));
         message.setRecipients(Message.RecipientType.TO,
            InternetAddress.parse("recipientemail@example.com"));
         message.setSubject("Testing Subject");
         message.setText("Dear Mail Crawler,"
            + "\n\n No spam to my email, please!");

         Transport.send(message);

         System.out.println("Done");

      } catch (MessagingException e) {
         throw new RuntimeException(e);
      }
   }
}

在上面的代码中，将`yourusername@gmail.com`和`yourpassword`替换为您自己的Gmail帐户的凭据。然后将`recipientemail@example.com`替换为您要发送电子邮件的收件人的电子邮件地址。执行此代码将在控制台上打印“Done”以指示电子邮件已成功发送。