问题
I need to send an email from my application using Gmail as the SMTP server. This is my mail connector class and I have set values in a separate property file
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);
}
}
Properties:
#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
Then I implemented a mail sender class, called "GroupEmail.class"
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);
}
}
}
After all I called the "GroupEmail.class" in a place that I needed to trigger the email to be sent.
GroupEmail groupEmail = new GroupEmail();
groupEmail.sendEmail();
I used Tomcat v8 server on localhost and when the application works, I got the below exception.
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
回答1:
Fix these common JavaMail mistakes.
Follow the connection debugging tips in the JavaMail FAQ.
Most likely there's a firewall or anti-virus product that's preventing you from connecting.
If Tomcat is running with a Java security manager, the JavaMail FAQ has information about configuring security permissions. If that doesn't help, the JavaMail FAQ also has information about debugging problems with security permissions.
Did I mention that you should read the JavaMail FAQ? :-)
回答2:
I know this is a very late answer, but want to share my experience when I face the same issue and tried almost Java core mail api, Apache mail api and Spring also for MimeMessage.
I tried 50+ times with Java JDK 1.7.0_80 and repeatedly failed with above subjected exception then I moved to JDK 1.8.0_151.
Now, before illustrating the source code, I will like to share my configuration.
Go to Gmail > Settings > Other Google Account settings under Accounts and Import > Sign-in & security.
Allow less secure apps: OFF (Means my application is not less secure)
2-Step Verification: Off
App Passwords (Click on it, and Google will generate a 16 characters long password for you, later done, change your gmail password with this 16 char long password (which is without any space)).
Now, my source code is:
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();
}
}
}
and the Spring mail debug loggings are below said:
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
Also please check your internet connection, antivirus settings and firewall access for being uninterrupted, hope this will help many from being wasting time.
来源：https://stackoverflow.com/questions/43511080/mailconnectexception-couldnt-connect-to-host-port-smtp-gmail-com-465-timeo