Question

我使用以下代码发送邮件，但我得到例外。

javax.mail.MessagingException：无法连接到SMTP主机：localhost，端口：25，响应：421

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SimpleEmailClient {
    public static void main(String[] args)  {
        try {
            // Recipient's email ID needs to be mentioned.
            String to = "rajasekharb974@gmail.com";
            String cc="raj479.mits@gmail.com";
            // Sender's email ID needs to be mentioned
            String from ="brajasekharreddy@chn.aithent.com";
            String host ="localhost";
            Properties properties = System.getProperties();
            // Setup mail server
            properties.setProperty("mail.smtp.host", host);
            Session session = Session.getDefaultInstance(properties);
            MimeMessage message = new MimeMessage(session);
            // Set From: header field of the header.
        message.setFrom(new InternetAddress(from));
            // Set To: header field of the header.
            message.addRecipient(Message.RecipientType.TO, new 
                    InternetAddress(to));
            message.addRecipient(Message.RecipientType.CC, new 
                    InternetAddress(cc));
            // Set Subject: header field
            message.setSubject("Email Notification");
            //  set the actual message
            message.setText("Hi,\n\nAcknowledgement Message :: \n\n"+"\n\nThanks,\n"+"Raj");
            // Send message
            Transport.send(message, message.getAllRecipients());
            System.out.println("Sent message successfully....");
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}*

Answer 1

您可以尝试这样： -

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class SendEmail
{
    public static void main(String [] args)
    {    
        // Sender's email ID needs to be mentioned
         String from = "your_mail@gmail.com";
         String pass ="mail_pass";
        // Recipient's email ID needs to be mentioned.
       String to = "reciver_mail@gmail.com";

       String host = "smtp.gmail.com";

       // Get system properties
       Properties properties = System.getProperties();
       // Setup mail server
       properties.put("mail.smtp.starttls.enable", "true");
       properties.put("mail.smtp.host", host);
       properties.put("mail.smtp.user", from);
       properties.put("mail.smtp.password", pass);
       properties.put("mail.smtp.port", "587");
       properties.put("mail.smtp.auth", "true");

       // Get the default Session object.
       Session session = Session.getDefaultInstance(properties);

       try{
          // Create a default MimeMessage object.
          MimeMessage message = new MimeMessage(session);

          // Set From: header field of the header.
          message.setFrom(new InternetAddress(from));

          // Set To: header field of the header.
          message.addRecipient(Message.RecipientType.TO,
                           new InternetAddress(to));

          // Set Subject: header field
          message.setSubject("This is the Subject Line!");

          // Now set the actual message
          message.setText("This is actual message");

          // Send message
          Transport transport = session.getTransport("smtp");
          transport.connect(host, from, pass);
          transport.sendMessage(message, message.getAllRecipients());
          transport.close();
          System.out.println("Sent message successfully....");
       }catch (MessagingException mex) {
          mex.printStackTrace();
       }
    }
}

从Java Application发送电子邮件

1 个答案: