使用java邮件api发送邮件时发生MailConnectException
尝试使用java mail api发送电子邮件。 而且我一直收到MailConnectException。 我尝试了多种方法来解决它而没有成功。
此声明抛出exception
transport.connect("smtp.gmail.com", "someone@gmail.com", "myPassword"); 谁能告诉我我做错了什么？
public static void main(String[] args) { String host = "smtp.gmail.com"; String from = "someone@gmail.com"; 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, "someone@hotmail.com"); message.setSubject("sending in a group"); message.setText("Welcome to JavaMail"); Transport transport = session.getTransport("smtp"); transport.connect("smtp.gmail.com", "someone@gmail.com", "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
这看起来像网络问题。 即使它可能由于各种原因而发生，例如： –
“无法连接到主机，端口”可能是由错误的主机名，错误的端口，阻塞防火墙（在服务器上，在网关上，甚至在您自己的机器上）， 网络故障 ，服务器停机等引起的。
你能用telnet连接到邮件服务器吗？
有关您犯下的一些错误，请参阅此常见问题解答http://www.oracle.com/technetwork/java/javamail/faq/index.html#commonmistakes
阅读有关如何使用Gmail发送电子邮件的答案https://stackoverflow.com/a/47452/3107043
Session session = Session.getInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }); props.put("mail.smtp.port", "587"); transport.send(message);
我遇到了同样的问题，原因是我打开了一个VPN。 希望这会有所帮助。