用 Java 发送邮件时出错答案

【问题标题】：Error when sending mail in Java用 Java 发送邮件时出错
【发布时间】：2014-09-26 20:20:16
【问题描述】：

我有桌面应用程序，发送邮件时遇到此错误 javax.mail.MessagingException: 无法连接到 SMTP 主机：smtp.gmail.com，端口：587；嵌套异常是：java.net.ConnectException：连接被拒绝：连接

~code~

 String host="smtp.mail.yahoo.com";
Properties props = new Properties();

props.setProperty("mail.smtp.auth", "true");
props.setProperty("mail.smtp.host",host);   
props.put("mail.smtp.host", host);
props.put("mail.stmp.user", "abc@yahoo.ca");//User name
//To use TLS
 props.put("mail.smtp.auth", "true");
 props.put("mail.smtp.starttls.enable", "true");
  props.put("mail.smtp.password", "mypassword"); //Password 
     props.put("mail.smtp.socketFactory.fallback", "false");
 Session session1 = Session.getDefaultInstance(props, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
    String username = "abc@yahoo.ca";
    String password = "mypassword";
   return new PasswordAuthentication(username, password);
 }
});



 MimeMessage msg = new MimeMessage(session1);
String from = "abc@yahoo.ca";
String subject = "Testing...";

 msg.setFrom(new InternetAddress(from));
msg.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(email));
msg.setSubject(subject);
Transport.send(msg);

【问题讨论】：

呃，你的代码是smtp.mail.yahoo.com，但例外是关于smtp.gmail.com？什么鬼？
你在哪里设置端口？

标签： java jakarta-mail

【解决方案1】：

YahooMail smtp port 是 465 或 587

添加这个：-

props.put("mail.smtp.port", "465");

或

props.put("mail.smtp.port", "587");

【讨论】：

【解决方案2】：

你找到JavaMail FAQ了吗？

这些条目将有所帮助：

【讨论】：

【解决方案3】：

试试这个：

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

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

      // Sender's email ID needs to be mentioned
      String from = "web@gmail.com";

      // Assuming you are sending email from localhost
      String host = "localhost";

      // Get system properties
      Properties properties = System.getProperties();

      // Setup mail server
      properties.setProperty("mail.smtp.host", host);

      // 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.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }
   }
}

【讨论】：