Question

以下是我发送邮件的代码：

import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendMail {
    public void sendMail(String m_from,String m_to,String m_subject,String m_body){
      try {
            Session m_Session;
            Message m_simpleMessage;
            InternetAddress m_fromAddress;
            InternetAddress m_toAddress;
            Properties m_properties;

            m_properties     = new Properties();
            m_properties.put("mail.smtp.host", "usdc2spam2.slingmedia.com"); 
            m_properties.put("mail.smtp.socketFactory.port", "465");
            m_properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
            m_properties.put("mail.smtp.auth", "true");
            m_properties.put("mail.smtp.port", "9000");

            m_Session=Session.getDefaultInstance(m_properties,new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("aaaaa","bbbbb@1"); // username and the password
                }
            });

            m_simpleMessage  =   new MimeMessage(m_Session);
            m_fromAddress    =   new InternetAddress(m_from);
            m_toAddress      =   new InternetAddress(m_to);

            m_simpleMessage.setFrom(m_fromAddress);
            m_simpleMessage.setRecipient(RecipientType.TO, m_toAddress);
            m_simpleMessage.setSubject(m_subject);

            m_simpleMessage.setContent(m_body, "text/html");

            //m_simpleMessage.setContent(m_body,"text/plain");

            Transport.send(m_simpleMessage);
        } catch (MessagingException ex) {
            ex.printStackTrace();
        }
    }
    public static void main(String[] args) {
      SendMail send_mail    =   new SendMail();
      String empName = "xxxxx";
      String title ="<b>Hi !"+empName+"</b>";
      send_mail.sendMail("123erft@slingmedia.com", "abz@gmail.com", "Please apply for leave for the following dates", title+"<br>by<br><b>HR<b>");
    }
}

但是当我运行代码时，它给了我以下异常。

javax.mail.MessagingException: Could not connect to SMTP host: usdc2spam2.slingmedia.com, port: 9000;
  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 samples.SendMail.sendMail(SendMail.java:46)
    at samples.SendMail.main(SendMail.java:55)
Caused by: java.net.ConnectException: Connection refused: 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:288)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)

当我对此usdc2spam2.slingmedia.com执行ping操作时，它会给我回复，没有任何问题。我正在使用windows 7

请帮我解决这个问题。

Answer 1

这两行让我遇到了问题：

m_properties.put("mail.smtp.socketFactory.port", "465");
  m_properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");

并添加了这一行：

m_properties.put("mail.smtp.starttls.enable", "true");

删除并添加上面的代码后，它运行良好。

Answer 2

在堆栈跟踪中出现问题的原因是什么：

java.net.ConnectException: Connection refused: connect

您是否需要密码才能连接到SMTP服务器？您确定使用的是正确的设置（如端口号）吗？你是代理人还是防火墙？您可以在常规邮件程序（例如Thunderbird）中使用这些设置并发送邮件吗？

Answer 3

尝试将端口9000添加到Windows防火墙中的入站规则中。

Answer 4

当您尝试连接的端口上没有服务侦听时，通常会发生此异常。

尝试使用putty或telnet进行连接。我敢打赌你会得到同样的错误。

验证以下事项：

您尝试连接的主机名和端口
服务器正在正确收听，
没有防火墙阻止连接。

javax.mail.MessagingException：无法连接到SMTP主机？

4 个答案: