用Java發送郵件的問題

Question

我的程序中有兩個例外.......

1. 無法連接到localhost，端口25

2. 拒絕連接

mail.java的代碼是---

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);
        }
    }
}

所以請告訴我該怎么做以及為什么會出現這些異常以及如何使用java＆localhost作為主機進行郵件發送。 ....................... 提前致謝。

Answer 1

請遵循此代碼; 將電子郵件發送到Java桌面非常有用，它確實有用。

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();
        }
    }
}

Answer 2

這是發送電子郵件的代碼段。

try {
        String host = "yourHostName";
        String from = "test@test.com";
        String to[] = {"test123@test123.com"};
        String subject = "Test";

        String message = "Test";

        Properties prop = System.getProperties();
        prop.put("mail.smtp.host", host);
        Session sess1 = Session.getInstance(prop, null);
        MimeMessage msg = new MimeMessage(sess1);
        msg.setFrom(new InternetAddress(from));
        InternetAddress[] toAddress = new InternetAddress[to.length];
        for (int i = 0; i < to.length; i++) {
            toAddress[i] = new InternetAddress(to[i]);
        }
        msg.setRecipients(Message.RecipientType.TO, toAddress);
        msg.setSubject(subject);

        //Fill the message
        msg.setText(message);
        Transport.send(msg);
    } catch (MessagingException me) {
        me.printStackTrace();
    }

發送電子郵件時有什么例外？ 您確定您的SMTP服務器正在偵聽默認端口25嗎？ 您是否可以通過Telnet手動發送電子郵件？ 此外，在測試時關閉任何防火牆只是為了確保。