Java程序中的邮件发送答案

【问题标题】：mail sending in Java programJava程序中的邮件发送
【发布时间】：2012-01-24 12:00:39
【问题描述】：

我正在使用以下代码使用 Java 程序发送电子邮件 (gmail)。我收到了AuthenticationFailedException。我在下面提到了错误。如何解决这个问题？在这个程序中如何使用发件人用户名、密码？

        package internet;

        import java.util.*;
        import javax.mail.*;
        import javax.mail.internet.*;
        import javax.activation.*;

        public class mail
        {
           public static void main(String [] args)
           {


              String to = "xxx@gmail.com";
              String from = "yyy@gmail.com";


              String host = "smtp.gmail.com";


              Properties properties = System.getProperties();


              properties.put("mail.smtp.host", "smtp.gmail.com");
              properties.put("mail.smtp.port", "587");
              properties.put("mail.smtp.auth", "true");
              properties.put("mail.smtp.starttls.enable", "true");



              Session session = Session.getDefaultInstance(properties);

              try{

                 MimeMessage message = new MimeMessage(session);


                 message.setFrom(new InternetAddress(from));


                 message.addRecipient(Message.RecipientType.TO,
                                          new InternetAddress(to));


                 message.setSubject("This is the Subject Line!");


                 message.setText("This is actual message");


                 Transport.send(message);
                 System.out.println("hi");
                 System.out.println("Sent message successfully....");
              }catch (MessagingException mex) {
                 mex.printStackTrace();
              }
           }
        }

我收到以下错误

    javax.mail.AuthenticationFailedException
            at javax.mail.Service.connect(Service.java:267)
            at javax.mail.Service.connect(Service.java:137)
            at javax.mail.Service.connect(Service.java:86)
            at javax.mail.Transport.send0(Transport.java:150)
            at javax.mail.Transport.send(Transport.java:80)
            at internet.mail.main(mail.java:59)

【问题讨论】：

检查google.co.in/…的结果
用户名和密码在哪里设置？不要在代码中看到它。

标签： java email gmail jakarta-mail

【解决方案1】：

您必须在t.sendMessage(message, addresses) 之前提供t.connect(host, user, password) 的登录凭据。（首先使用Transport t = session.getTransport("smtp") 获取Transport 对象。

【讨论】：

不，这行不通。 Transport.send 是一个忽略 Transport 实例的静态方法，因此忽略了您在该实例上执行的“连接”。您需要使用 Transport.sendMessage 方法。请参阅 JavaMail 常见问题解答 (oracle.com/technetwork/java/javamail/faq/index.html#connectsend)。
感谢您的提示。答案已调整。

【解决方案2】：

您是否尝试过本教程？ http://www.mkyong.com/java/javamail-api-sending-email-via-gmail-smtp-example/

好像忘记设置用户名和密码了。

【讨论】：

【解决方案3】：

您可以使用javax.mail.Authenticator 扩展来执行此操作。举个例子：

public class MySMTPAuthenticator extends javax.mail.Authenticator {

    private String userName;
    private String password;

    public MySMTPAuthenticator(String userName, String password) {
        super();
        this.userName=userName;
        this.password=password;
    }

    public PasswordAuthentication getPasswordAuthentication() {
       return new PasswordAuthentication(userName, password);
    }

}

然后，要使用它，在您的发送代码处，您将获得与 Authenticator 的会话：

    Authenticator auth = new MySMTPAuthenticator("user", "password");
    Session session = Session.getDefaultInstance(MySMTPAuthenticator, auth);

【讨论】：

【解决方案4】：

下载 Java Mail API 和，使用两个 jar 作为依赖发送邮件 mailapi.jar 和 smtp.jar

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class JavaEmail {

    Properties emailProperties;
    Session mailSession;
    MimeMessage emailMessage;

  public static void main(String args[]) throws AddressException, MessagingException {
      JavaEmail javaEmail = new JavaEmail();
      javaEmail.setMailServerProperties();
      javaEmail.createEmailMessage();
      javaEmail.sendEmail();
  }

  public void setMailServerProperties() {
      String emailPort = "587";//gmail's smtp port
      emailProperties = System.getProperties();
      emailProperties.put("mail.smtp.port", emailPort);
      emailProperties.put("mail.smtp.auth", "true");
      emailProperties.put("mail.smtp.starttls.enable", "true");
  }

  public void createEmailMessage() throws AddressException, MessagingException {
      String[] toEmails = { "abc@pqr.com" };//Specify array of mail id to send multiple person
      String emailSubject = "Java Email";
      String emailBody = "This is an email sent by <b>JavaMail</b> api.";
      mailSession = Session.getDefaultInstance(emailProperties, null);
      emailMessage = new MimeMessage(mailSession);
      for (int i = 0; i < toEmails.length; i++) {
          emailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(toEmails[i]));
      }
      emailMessage.setSubject(emailSubject);
      emailMessage.setContent(emailBody, "text/html");//for a html email
      //emailMessage.setText(emailBody);// for a text email       
  }

  public void sendEmail() throws AddressException, MessagingException {
      String emailHost = "smtp.gmail.com";
      String fromUser = "your emailid here";//just the id alone without @gmail.com
      String fromUserEmailPassword = "your email password here";
      Transport transport = mailSession.getTransport("smtp"); 
      transport.connect(emailHost, fromUser, fromUserEmailPassword);
      transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
      transport.close();
      System.out.println("Email sent successfully.");
    }
}

【讨论】：