smtp 主机在 android 中设置为 localhost答案

【问题标题】：smtp host set to localhost in androidsmtp 主机在 android 中设置为 localhost
【发布时间】：2018-03-21 14:21:51
【问题描述】：

在 Android Studio 中运行以下代码后，我遇到了问题：-

java.lang.RuntimeException: javax.mail.MessagingException: 不能连接到 SMTP 主机：localhost，端口：25；嵌套异常是： java.net.SocketException：权限被拒绝

它使用的是 localhost 和 25 端口，而不是分配的主机和端口。

public class GMailSender extends Authenticator {
private String user;
private String password;
private Session session;

public GMailSender(final String user, final String password) {
    this.user = user;
    this.password = password;


    //Properties props = new Properties();
    Properties props = System.getProperties();
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.port", "587");

    Session session = Session.getInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(user, password);
                }
            });


}

protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication(user, password);
}
public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {

    try {
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("garimabareja28@gmail.com"));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse("garimabareja28@gmail.com"));
        message.setSubject("Testing Subject");
        message.setText("Dear Mail Crawler,"
                + "\n\n No spam to my email, please!");

        MimeBodyPart messageBodyPart = new MimeBodyPart();

        Multipart multipart = new MimeMultipart();

        messageBodyPart = new MimeBodyPart();
        String file = "path of file to be attached";
        String fileName = "attachmentName";
        DataSource source = new FileDataSource(file);
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(fileName);
        multipart.addBodyPart(messageBodyPart);

        message.setContent(multipart);

        Transport.send(message);

        System.out.println("Done");

    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }

    }
}

请帮帮我。

提前致谢！

【问题讨论】：

After running following code in Android Studio, 那是不可能的。它只能在您的 Android 设备上运行。或者安卓模拟器。那么你正在做什么？请编辑您的帖子以提供此信息。
我没有做太多的 Android 开发，但看起来你在构造函数中重新定义了 session 属性，而不是简单地实例化它。你可能想调查一下。

标签： android

【解决方案1】：

属性 props = new Properties();

    //Configuring properties for gmail
    //If you are not using gmail you may need to change the values
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.debug", "true");
    props.put("mail.smtp.port", "465");

    //Creating a new session
    session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                //Authenticating the password
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(Config.EMAIL, Config.PASSWORD);
                }
            });

    try {
        //Creating MimeMessage object
        MimeMessage mm = new MimeMessage(session);

        //Setting sender address
        mm.setFrom(new InternetAddress(Config.EMAIL));
        //Adding receiver
        mm.addRecipient(Message.RecipientType.TO, new InternetAddress(email));
        //Adding subject
        mm.setSubject(subject);
        //Adding message
        mm.setText(message);

        //Sending email
        Transport.send(mm);

    } catch (MessagingException e) {
        e.printStackTrace();
    }
    return null;
}

【讨论】：