使用Java Mail API发送邮件时出现MailConnectException [英] MailConnectException while sending mail using java mail api

问题描述

尝试使用Java Mail API发送电子邮件.而且我一直在收到MailConnectException.我尝试了多种解决方法，但均未成功.

Trying to send an email using java mail api. And I keep getting MailConnectException. I have tried multiple ways to solve it without success.

此语句引发异常

transport.connect("smtp.gmail.com", "[e-mail]", "myPassword");

有人可以告诉我我在做什么错吗?

Can anyone tell me what I'm doing wrong?

public static void main(String[] args) {
    String host = "smtp.gmail.com";
    String from = "[e-mail]";
    Properties props = System.getProperties();
    props.put("mail.smtp.host", host);
    props.put("mail.smtp.user", from);
    props.put("mail.smtp.password", "myPassword");
    props.put("mail.smtp.port", "465"); 
    props.put("mail.smtp.auth", "true");
    try{
        Session session = Session.getDefaultInstance(props, null);
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.addRecipients(Message.RecipientType.TO, "[e-mail]");
        message.setSubject("sending in a group");
        message.setText("Welcome to JavaMail");
        Transport transport = session.getTransport("smtp");
        transport.connect("smtp.gmail.com", "[e-mail]", "myPassword");//CAUSES EXCEPTION
        transport.sendMessage(message, message.getAllRecipients());
    }catch(MessagingException e){
        e.printStackTrace();
    }
}

堆栈跟踪:

com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
  nested exception is:
    java.net.ConnectException: Connection timed out: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1984)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:656)
    at javax.mail.Service.connect(Service.java:345)
    at javax.mail.Service.connect(Service.java:226)
    at com.karmacrafts.util.CustomEmail.main(CustomEmail.java:127)
Caused by: java.net.ConnectException: Connection timed out: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:301)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:229)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1950)
    ... 4 more

推荐答案

这看起来像是网络问题.即使它可能由于各种原因而发生，例如:-

This looks like network problem. Even though it could occur due to variety of reasons, like :-

主机名，端口错误，防火墙阻塞(在服务器，网关，甚至在您自己的计算机上)，网络故障"可能导致无法连接到主机，端口" ，服务器停机等.

"Couldn't connect to host, port" could be caused by wrong host name, wrong port, a blocking firewall (on the server, on gateways, even on your own machine), network failure, server downtime, etc.

您可以使用telnet连接到邮件服务器吗?

Can you connect to the mail server using telnet ?

如果您犯了一些错误，也请参阅此常见问题解答 http://www.oracle.com/technetwork/java/javamail/faq/index.html#commonmistakes

Also see this FAQ for some mistakes you committed http://www.oracle.com/technetwork/java/javamail/faq/index.html#commonmistakes

阅读此答案，了解如何使用gmail https://stackoverflow.com/a/47452/3107043 发送电子邮件

Read this answer on how to send emails using gmail https://stackoverflow.com/a/47452/3107043

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