Question

package jmail;

import java.util.Date; import java.util.Properties; 
import javax.mail.Authenticator; 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 HtmlJavaSend {

public void sendHtmlEmail(String host, String port,
        final String userName, final String password, String toAddress,
        String subject, String message) throws AddressException,
        MessagingException {

    // sets SMTP server properties
    Properties properties = new Properties();
    properties.put("mail.man.com", host);
    properties.put("mail.25", port);
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.starttls.enable", "true");
    properties.put("mail.smtp.ssl.trust","mail.man.com");

    // creates a new session with an authenticator
    Authenticator auth = new Authenticator() {
        public PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(userName, password);
        }
    };

    Session session = Session.getInstance(properties, auth);

    // creates a new e-mail message
    Message msg = new MimeMessage(session);

    msg.setFrom(new InternetAddress(userName));
    InternetAddress[] toAddresses = {new InternetAddress(toAddress)};
    msg.setRecipients(Message.RecipientType.TO, toAddresses);
    msg.setSubject(subject);
    msg.setSentDate(new Date());
    // set plain text message
    msg.setContent(message, "text/html");

    // sends the e-mail
    Transport.send(msg);

}

public static void main(String[] args) {
    // SMTP server information
    String host = "mail.man.com";
    String port = "25";
    String mailFrom = "admin@man.com";
    String password = "Man";

    // outgoing message information
    String mailTo = "ji@man.com";
    String subject = "Hello my friend";

    // message contains HTML markups
    String message = "<i>Greetings!</i><br>";
    message += "<b>Wish you a nice day!</b><br>";
    message += "<font color=red>Duke</font>";

    HtmlJavaSend mailer = new HtmlJavaSend();

    try {
        mailer.sendHtmlEmail(host, port, mailFrom, password, mailTo,
                subject, message);
        System.out.println("Email sent.");
    } catch (Exception ex) {
        System.out.println("Failed to sent email.");
        ex.printStackTrace();
    }
} }

错误是：

错误运行：无法发送电子邮件。 com.sun.mail.util.MailConnectException：无法连接到主机， port：localhost，25;超时-1;嵌套异常是： java.net.ConnectException：拒绝连接：connect at com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:2100）在 com.sun.mail.smtp.SMTPTransport.protocolConnect（SMTPTransport.java:699）在javax.mail.Service.connect（Service.java:388）at javax.mail.Service.connect（Service.java:246）at javax.mail.Service.connect（Service.java:195）at javax.mail.Transport.send0（Transport.java:254）at javax.mail.Transport.send（Transport.java:124）at jmail.HtmlJavaSend.sendHtmlEmail（HtmlJavaSend.java:62）at jmail.HtmlJavaSend.main（HtmlJavaSend.java:85）引起： java.net.ConnectException：拒绝连接：connect at java.net.DualStackPlainSocketImpl.connect0（Native Method）at java.net.DualStackPlainSocketImpl.socketConnect（DualStackPlainSocketImpl.java:79）在 java.net.AbstractPlainSocketImpl.doConnect（AbstractPlainSocketImpl.java:339）在 java.net.AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java:200）在 java.net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:182）在java.net.PlainSocketImpl.connect（PlainSocketImpl.java:172）at java.net.SocksSocketImpl.connect（SocksSocketImpl.java:392）at java.net.Socket.connect（Socket.java:579）at java.net.Socket.connect（Socket.java:528）at com.sun.mail.util.SocketFetcher.createSocket（SocketFetcher.java:331）在com.sun.mail.util.SocketFetcher.getSocket（SocketFetcher.java:238）在 com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:2066） ... 8更多成功（总时间：1秒）

Answer 1

这里有错误：

properties.put("mail.man.com", host);
properties.put("25", port);

应该是：

properties.put("mail.smtp.host", host);
properties.put("mail.smtp.port", port);

Answer 2

根据：

properties.put("mail.25", port);

您正在连接到提供明文 SMTP 的端口。这得到了您在使用 telnet 时接收 202 service ready message 消息的观察的支持。但是您还设置了使用 TLS 的属性：

properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.ssl.trust","mail.man.com");

如果您使用端口 25，请不要启用 TLS，或者在启用 TLS 的情况下使用端口 465（使用 TLS 的 SMTP 的标准端口）。

com.sun.mail.util.MailConnectException：无法连接到主机，端口：localhost，25;超时-1;

2 个答案: