通过 Java 发送电子邮件 - javax.mail.MessagingException:无法连接到 SMTP 主机:本地主机，端口:587； [英] Sending emails through Java - javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 587;

问题描述

我目前正在处理一个涉及创建 .jar 文件的项目.要实现以下目标，我应该导出/读取朋友注册表的路径，一旦完成，我应该通过电子邮件获取结果.整个概念是创建 jar 文件，一旦点击它，我就会通过我的电子邮件获得结果，因为我实际上是通过电子邮件发送的.

I'm currently working on a project that involves the creation of a .jar file. The following is to be achieved, I'm supposed to export/read the path of a friend's registry, once this is done I'm supposed to get the result back via email. The whole concept is in creating the jar file and once it's clicked I get the results through my email since I actually sent it through email.

(我希望这是有道理的)

(I hope this makes sense)

所以首先，我结合了以下代码来实际读取注册表并显示密钥(我从有关读/写注册表的堆栈溢出的流行帖子中得到它)所以读取过程工作正常，现在我的问题带有电子邮件代码，

So first, I've combined the following code to actually read the registry and display the keys ( i got it from the popular post on stack overflow for read/write registries) so the reading process is working fine, now my problem is with the email code,

(我不太确定此代码的原始所有者是谁，但完全归功于他)我正在尝试使此电子邮件代码的基本概念起作用，以便我可以继续将我的 jar 文件作为附件发送，并在用户单击 jar 文件时以某种方式将其链接到我的代码，注册表结果将通过电子邮件回复给我.

(I'm not quite sure who the original owner to this code is but full credit goes it him) I'm trying to get the basic concept of this email code to work so that I can continue working on sending my jar file as an attachment and link it to my code in a way when a user clicks on the jar file, the registry results will be emailed back to me.

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.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class MailCode {

  public static void main(String[] args) throws Exception {


     final String smtp_host = "smtp.gmail.com";
    final String smtp_username = "[e-mail]";
    final String smtp_password = "password";
    final String smtp_connection = "TLS";  // Use 'TLS' or 'SSL' connection

    final String toEmail="[e-mail]";
    final String fromEmail="**@gmail.com";

    Properties props = new Properties();
    props.put("mail.smtp.auth", "true");

   if (smtp_connection.equals("TLS")) {
            props.put("mail.smtp.starttls.enable", "true");
            props.put("mail.smtp.port", "587");
    } else{
            props.put("mail.smtp.socketFactory.port", "465");
            props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
            props.put("mail.smtp.port", "465");
    }

    Session session = Session.getInstance(props,
      new javax.mail.Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(smtp_username, smtp_password);
            }
      });

    try {
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(fromEmail, "NoReply"));
        msg.addRecipient(Message.RecipientType.TO,
                         new InternetAddress(toEmail, "Mr. Recipient"));
        msg.setSubject("Welcome To JavaMail API");
        msg.setText("JavaMail API Test - Sending email example through remote smtp server");
        Transport.send(msg);
        System.out.println("Email sent successfully...");
    } catch (AddressException e) {
        throw new RuntimeException(e);
    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }
   }
 }

这是我收到的错误消息:

This is the error message I'm getting:

Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 587;
nested exception is:
java.net.SocketException: Permission denied: connect  

推荐答案

下面的代码可以帮助你解决你的问题，它的工作原理........

The following code may help you to solve your problem, its working........

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

public class Email {

private static String USER_NAME = "username";  // GMail user name (just the part before "@gmail.com")
private static String PASSWORD = "password"; // GMail password

private static String RECIPIENT = "[e-mail]";

public static void main(String[] args) {
    String from = USER_NAME;
    String pass = PASSWORD;
    String[] to = { RECIPIENT }; // list of recipient email addresses
    String subject = "Java send mail example";
    String body = "hi ....,!";

    sendFromGMail(from, pass, to, subject, body);
}

private static void sendFromGMail(String from, String pass, String[] to, String subject, String body) {
    Properties props = System.getProperties();
  String host = "smtp.gmail.com";

    props.put("mail.smtp.starttls.enable", "true");

    props.put("mail.smtp.ssl.trust", host);
    props.put("mail.smtp.user", from);
    props.put("mail.smtp.password", pass);
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.auth", "true");


    Session session = Session.getDefaultInstance(props);
    MimeMessage message = new MimeMessage(session);

    try {


        message.setFrom(new InternetAddress(from));
        InternetAddress[] toAddress = new InternetAddress[to.length];

        // To get the array of addresses
        for( int i = 0; i < to.length; i++ ) {
            toAddress[i] = new InternetAddress(to[i]);
        }

        for( int i = 0; i < toAddress.length; i++) {
            message.addRecipient(Message.RecipientType.TO, toAddress[i]);
        }



        message.setSubject(subject);
        message.setText(body);


        Transport transport = session.getTransport("smtp");


        transport.connect(host, from, pass);
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();

    }
    catch (AddressException ae) {
        ae.printStackTrace();
    }
    catch (MessagingException me) {
        me.printStackTrace();
    }
    }
   } 

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