javax.mail.MessagingException：无法连接到 SMTP 主机：smtp.gmail.com，端口：587
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javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 587
提问by user407269
I have a java application which sends emails. But when i run the code i get the following exception.i have also check the authentication settings and with 485 port no but still error remains.
我有一个发送电子邮件的 Java 应用程序。但是当我运行代码时，我得到以下异常。我还检查了身份验证设置，并且 485 端口没有，但仍然存在错误。
DEBUG: setDebug: JavaMail version 1.4.4
DEBUG: getProvider() returning
javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems,
Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 587, isSSL false
javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port:
587;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at SimpleMailWithAttachment.<init>(SimpleMailWithAttachment.java:46)
at SimpleMailWithAttachment.main(SimpleMailWithAttachment.java:64)
Caused by: java.net.ConnectException: Connection refused: connect
Here is the code i am using to try to send mail
这是我用来尝试发送邮件的代码
public SimpleMailWithAttachment() {
Properties props = System.getProperties();
props.setProperty("mail.smtp.port", "587");
props.setProperty("mail.smtp.host", "smtp.gmail.com");
props.setProperty("mail.smtp.starttls.enable", "true");
props.setProperty("mail.smtp.auth", "true");
Authenticator auth = new MyAuthenticator();
Session smtpSession = Session.getInstance(props, auth);
smtpSession.setDebug(true);
MimeMessage message = new MimeMessage(smtpSession);
try {
message.setFrom(new InternetAddress(email));
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
final String encoding = "UTF-8";
message.setSubject(subject, encoding);
message.setText(text, encoding);
Transport.send(message);
} catch (Exception ex) {
ex.printStackTrace();
}
}
static class MyAuthenticator extends Authenticator {
public PasswordAuthentication getPasswordAuthentication() {
String username = "******@gmail.com";
String password = "*****";
return new PasswordAuthentication(username, password);
}
}
回答by Matti Lyra
I don't think you can use GMail without authentication. You need to use port 465 not 587.
我不认为您可以在没有身份验证的情况下使用 GMail。您需要使用端口 465 而不是 587。
See http://email.about.com/od/accessinggmail/f/Gmail_SMTP_Settings.htm
请参阅http://email.about.com/od/accessinggmail/f/Gmail_SMTP_Settings.htm
