Question

我需要使用Gmail作为SMTP服务器从我的应用程序发送电子邮件。这是我的邮件连接器类，我在单独的属性文件中设置了值

    public class EmailConnector {


    public static Session sessionCreate() {
        final String fromEmail = ConfigurationManager.getInstance().getProperty(EmailConfig.SENDER_EMAIL.toString());

        final String password = ConfigurationManager.getInstance().getProperty(EmailConfig.SENDER_PASSWORD.toString());

        Properties props = new Properties();
        props.put("mail.smtp.host", ConfigurationManager.getInstance().getProperty(EmailConfig.SMTP_HOST.toString()));

        props.put("mail.smtp.socketFactory.port",
                ConfigurationManager.getInstance().getProperty(EmailConfig.SSL_PORT.toString()));

        props.put("mail.smtp.socketFactory.class",
                ConfigurationManager.getInstance().getProperty(EmailConfig.SSL_FACTORY_CLASS.toString()));

        props.put("mail.smtp.auth",
                ConfigurationManager.getInstance().getProperty(EmailConfig.SMTP_AUTHENTICATION.toString()));

        props.put("mail.smtp.port", ConfigurationManager.getInstance().getProperty(EmailConfig.SMTP_PORT.toString()));

        Authenticator auth = new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(fromEmail, password);
            }
        };
        return Session.getDefaultInstance(props, auth);
    }
}

属性：

#Email send configuration
SENDER_EMAIL = abcalerts@gmail.com
SENDER_PASSWORD = abcalert321
SMTP_HOST = smtp.gmail.com
SSL_PORT = 465
SMTP_AUTHENTICATION = true
SMTP_PORT = 465
SSL_FACTORY_CLASS = javax.net.ssl.SSLSocketFactory

然后我实现了一个名为“GroupEmail.class”的邮件发件人类

public class GroupEmail {

    public void sendEmail() throws IOException {
        String recipient = "nirmalauwucst@gmail.com";

        Session session = EmailConnector.sessionCreate();
        /* subject of email */
        String emailSubject = "ABC_Alert";
        try {
            MimeMessage msg = new MimeMessage(session);
            msg.addHeader("Content-type", "text/HTML; charset=UTF-8");
            msg.addHeader("format", "flowed");
            msg.addHeader("Content-Transfer-Encoding", "8bit");

            msg.setFrom(new InternetAddress("abcalerts@gmail.com", "ABC Alerts"));

            msg.setReplyTo(InternetAddress.parse("abcalerts@gmail.com"));

            msg.setSubject(emailSubject, "UTF-8");

            msg.setSentDate(new Date());
            /* buyer email address */
            msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipient));

            /* Create the message body part */
            msg.setText("A new Test-Alert from AB_Alerts");

            /* Send message */
            Transport.send(msg, "abcalerts@gmail.com", "abcalert321");

        } catch (MessagingException | UnsupportedEncodingException e) {
            SystemLogger.logErrorMessege(this, e);
        }
    }

}

毕竟我在一个需要触发要发送的电子邮件的地方调用了“GroupEmail.class”。

GroupEmail groupEmail = new GroupEmail();
        groupEmail.sendEmail();

我在localhost上使用了Tomcat v8服务器，当应用程序运行时，我得到了以下异常。

98656 [http-nio-8080-exec-9] ERROR it.codegen.rnd.cgalert.notification.template.email.GroupEmail  - Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
  nested exception is:
    java.net.SocketException: Permission denied: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2100)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:699)
    at 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)
..more

Answer 1

修复这些common JavaMail mistakes。

关注connection debugging tips in the JavaMail FAQ。

很可能是防火墙或防病毒产品阻止您连接。

如果Tomcat使用Java安全管理器运行JavaMail FAQ has information about configuring security permissions。如果这没有帮助，请JavaMail FAQ also has information about debugging problems with security permissions。

我是否提到你应该阅读JavaMail FAQ？： - ）

Answer 2

我知道这是一个非常晚的答案，但是当我遇到同样的问题并且尝试了几乎Java核心邮件api，Apache邮件api和Spring时，我想分享我的经验。 MimeMessage。

我用Java JDK 1.7.0_80尝试了50次以上并且多次失败并且上面遇到异常然后我转移到了JDK 1.8.0_151。

现在，在说明源代码之前，我想分享一下我的配置。

转到Gmail＆gt; Settings＆gt; Other Google Account settings下的Accounts and Import＆gt; Sign-in & security。

允许不太安全的应用：关闭（意味着我的应用程序安全性不低）

两步验证：关闭

应用密码（点击它，Google将为您生成16个字符长的密码，稍后完成，使用此16个字符长密码更改您的gmail密码（没有任何空格））

现在，我的源代码是：

import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import javax.swing.JOptionPane;
import java.util.List;
import java.util.Properties;

public class Email {

    public final void prepareAndSendEmail(String htmlMessage, String toMailId) {

        final OneMethod oneMethod = new OneMethod();
        final List<char[]> resourceList = oneMethod.getValidatorResource();

        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost("smtp.gmail.com");
        mailSender.setPort(465);

        mailSender.setUsername(String.valueOf(resourceList.get(0)));
        mailSender.setPassword(String.valueOf(resourceList.get(1)));

        //from email id and password
        System.out.println("Username is : " + String.valueOf(resourceList.get(0)).split("@")[0]);
        System.out.println("Password is : " + String.valueOf(resourceList.get(1)));

        Properties mailProp = mailSender.getJavaMailProperties();
        mailProp.put("mail.transport.protocol", "smtp");
        mailProp.put("mail.smtp.auth", "true");
        mailProp.put("mail.smtp.starttls.enable", "true");
        mailProp.put("mail.smtp.starttls.required", "true");
        mailProp.put("mail.debug", "true");
        mailProp.put("mail.smtp.ssl.enable", "true");

        MimeMessage mimeMessage = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
            helper.setTo(toMailId);
            helper.setSubject("Welcome to Subject Part");
            helper.setText(htmlMessage, true);

            //Checking Internet Connection and then sending the mail
            if(OneMethod.isNetConnAvailable())
                mailSender.send(mimeMessage);
            else
                JOptionPane.showMessageDialog(null, "No Internet Connection Found...");
        } catch (MessagingException e) {
            e.printStackTrace();
        }

    }

}

并且Spring mail调试日志记录如下：

Username is : exampleusername
Password is : abcdefghijklmnop
DEBUG: JavaMail version 1.6.0
DEBUG: successfully loaded resource: /META-INF/javamail.default.providers
DEBUG: Tables of loaded providers
DEBUG: Providers Listed By Class Name: {com.sun.mail.smtp.SMTPSSLTransport=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle]}
DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]}
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 465, isSSL true
220 smtp.gmail.com ESMTP 12sm62330270pfr.147 - gsmtp
DEBUG SMTP: connected to host "smtp.gmail.com", port: 465

EHLO Administrator
250-smtp.gmail.com at your service, [157.48.195.205]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
DEBUG SMTP: Found extension "SIZE", arg "35882577"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "AUTH", arg "LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH"
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "CHUNKING", arg ""
DEBUG SMTP: Found extension "SMTPUTF8", arg ""
DEBUG SMTP: STARTTLS requested but already using SSL
DEBUG SMTP: protocolConnect login, host=smtp.gmail.com, user=exampleusername@gmail.com, password=<non-null>
DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM XOAUTH2 
DEBUG SMTP: Using mechanism LOGIN
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN succeeded
DEBUG SMTP: use8bit false
MAIL FROM:<Administrator@Administrator>
250 2.1.0 OK 12sm62330270pfr.147 - gsmtp
RCPT TO:<somebody@live.com>
250 2.1.5 OK 12sm62330270pfr.147 - gsmtp
DEBUG SMTP: Verified Addresses
DEBUG SMTP:   somebody@live.com
DATA
354  Go ahead 12sm62330270pfr.147 - gsmtp
Date: Mon, 19 Feb 2018 18:55:29 +0530 (IST)
To: somebody@live.com
Message-ID: <2023168072.2.1519046734494@Administrator>
Subject: Welcome to Subject Part
MIME-Version: 1.0
Content-Type: multipart/mixed; 
    boundary="----=_Part_0_1884507527.1519046720984"

------=_Part_0_1884507527.1519046720984
Content-Type: multipart/related; 
    boundary="----=_Part_1_1634862487.1519046721031"

------=_Part_1_1634862487.1519046721031
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

<!DOCTYPE html>
<html>
Your html page source code is here
</html>

------=_Part_1_1634862487.1519046721031--

------=_Part_0_1884507527.1519046720984--
.
250 2.0.0 OK 1519046738 12sm62330270pfr.147 - gsmtp
DEBUG SMTP: message successfully delivered to mail server
QUIT
221 2.0.0 closing connection 12sm62330270pfr.147 - gsmtp

另外，请检查您的互联网连接，防病毒设置和防火墙访问是否不间断，希望这将有助于许多人浪费时间。

MailConnectException：无法连接到主机，端口：smtp.gmail.com，465;超时-1

2 个答案: