java - Java发送邮件的问题

Question

我的程序中出现了两个异常......

1. 无法连接到本地主机，端口 25

2. 连接被拒绝

mail.java的代码是---

package jMail;

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

public class Mail {

    private String to;
    private String from;
    private String message;
    private String subject;
    private String smtpServ;

    public String getTo() {
        return to;
    }

    public void setTo(String to) {
        this.to = to;
    }

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public String getSmtpServ() {
        return smtpServ;
    }

    public void setSmtpServ(String smtpServ) {
        this.smtpServ = smtpServ;
    }

    public Exception sendMail(){
        try
        {
            Properties props = System.getProperties();
              // -- Attaching to default Session, or we could start a new one --
              props.put("mail.transport.protocol", "smtp");
              props.put("mail.smtp.starttls.enable","true");
              props.put("mail.smtp.host","localhost");
              props.put("mail.smtp.auth", "true");
              Authenticator auth = new SMTPAuthenticator();
              Session session = Session.getInstance(props, auth);
              // -- Create a new message --
              Message msg = new MimeMessage(session);
              // -- Set the FROM and TO fields --
              msg.setFrom(new InternetAddress(from));
              msg.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(to, false));
              // -- We could include CC recipients too --
              // if (cc != null)
              // msg.setRecipients(Message.RecipientType.CC
              // ,InternetAddress.parse(cc, false));
              // -- Set the subject and body text --
              msg.setSubject(subject);
              msg.setText(message);
              // -- Set some other header information --
              msg.setHeader("MyMail", "Java Mail Test");
              msg.setSentDate(new Date());
              // -- Send the message --
              Transport.send(msg);
              System.out.println("Message sent to"+to+" OK.");
              return null;
        }
        catch (Exception ex)
        {
          ex.printStackTrace();
          System.out.println("Exception "+ex);
          return ex;
        }
    }

    private class SMTPAuthenticator extends javax.mail.Authenticator {
        @Override
        public PasswordAuthentication getPasswordAuthentication() {
            String username = "Java.Mail.CA@gmail.com";
            String password = "javamail";
            return new PasswordAuthentication(username, password);
        }
    }
}

所以请告诉我该怎么做以及为什么会出现这些异常以及我如何使用 java 和 localhost 作为主机发送邮件。......................提前致谢。

Answer 1

只需遵循此代码即可；将电子邮件发送到 java 桌面确实非常有用，而且它可以工作。

import java.util.*;
import javax.activation.CommandMap;
import javax.activation.MailcapCommandMap;
import javax.mail.*;
import javax.mail.Provider;


import javax.mail.internet.*; 
public class Main
{
    public static void main(String[] args)
    {
        final String username = "your@gmail.com";
        final String password = "password";
        Properties prop = new Properties();
        prop.put("mail.smtp.auth", "true");
        prop.put("mail.smtp.host", "smtp.gmail.com");
        prop.put("mail.smtp.port", "587");
        prop.put("mail.smtp.starttls.enable", "true");
        Session session = Session.getDefaultInstance(prop, new javax.mail.Authenticator()
        {
            protected PasswordAuthentication getPasswordAuthentication()
            {
                return new PasswordAuthentication(username, password);
            }
        });
        try
        {
            String body = "Dear Renish Khunt Welcome";
            String htmlBody = "<strong>This is an HTML Message</strong>";
            String textBody = "This is a Text Message.";
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("your@gmail.com"));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("receiver@gmail.com"));
            message.setSubject("Testing Subject");
            MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
            mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
            mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
            mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
            mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
            mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
            CommandMap.setDefaultCommandMap(mc);
            message.setText(htmlBody);
            message.setContent(textBody, "text/html");
            Transport.send(message);
            System.out.println("Done");
        }
        catch (MessagingException e)
        {
            e.printStackTrace();
        }
    }
}