邮件发送用户名密码认证

Question

我正在开发一个从中发送电子邮件的应用程序。为了发送电子邮件，我使用了没有意图代码的代码。因为它是应用程序的需要。我使用的代码如下：

import java.util.Date;
import java.util.Properties;
import javax.activation.CommandMap;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.activation.MailcapCommandMap;
import javax.mail.BodyPart;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;


public class Mail extends javax.mail.Authenticator {
    private String _user;
    private String _pass;

    private String[] _to;
    private String _from;

    private String _port;
    private String _sport;

    private String _host;

    private String _subject;
    private String _body;

    private boolean _auth;

    private boolean _debuggable;

    private Multipart _multipart;


    public Mail() {
        _host = "smtp.gmail.com"; // default smtp server
        _port = "465"; // default smtp port
        _sport = "465"; // default socketfactory port

        _user = ""; // username
        _pass = ""; // password
        _from = ""; // email sent from
        _subject = ""; // email subject
        _body = ""; // email body

        _debuggable = false; // debug mode on or off - default off
       _auth = true; // smtp authentication - default on

       _multipart = new MimeMultipart();

       // There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added.
       MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
       mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
       mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
       mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
       mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
       mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
       CommandMap.setDefaultCommandMap(mc);
   }

   public Mail(String user, String pass) {
       this();

       _user = user;
       _pass = pass;
   }

   public boolean send() throws Exception {
       Properties props = _setProperties();

       if(!_user.equals("") && !_pass.equals("") && _to.length > 0 && !_from.equals("") && !_subject.equals("") && !_body.equals("")) {
           Session session = Session.getInstance(props, this);

           MimeMessage msg = new MimeMessage(session);

           msg.setFrom(new InternetAddress(_from));

           InternetAddress[] addressTo = new InternetAddress[_to.length];
           for (int i = 0; i < _to.length; i++) {
               addressTo[i] = new InternetAddress(_to[i]);
           }
       msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);

           msg.setSubject(_subject);
           msg.setSentDate(new Date());

           // setup message body
           BodyPart messageBodyPart = new MimeBodyPart();
           messageBodyPart.setText(_body);
           _multipart.addBodyPart(messageBodyPart);

           // Put parts in message
           msg.setContent(_multipart);

           // send email
           Transport.send(msg);

           return true;
       } else {
           return false;
       }
    }

    public void addAttachment(String filename) throws Exception {
        BodyPart messageBodyPart = new MimeBodyPart();
        DataSource source = new FileDataSource(filename);
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(filename);

        _multipart.addBodyPart(messageBodyPart);
    }

    @Override
    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(_user, _pass);
    }

    private Properties _setProperties() {
        Properties props = new Properties();

        props.put("mail.smtp.host", _host);

        if(_debuggable) {
            props.put("mail.debug", "true");
        }

        if(_auth) {
            props.put("mail.smtp.auth", "true");
        }

        props.put("mail.smtp.port", _port);
        props.put("mail.smtp.socketFactory.port", _sport);
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");

        return props;
    }

    // the getters and setters
    public String getBody() {
        return _body;
    }

    public void setBody(String _body) {
        this._body = _body;
    }

    public String[] get_to() {
        return _to;
    }

    public void set_to(String[] _to) {
        this._to = _to;
    }

    public String get_from() {
        return _from;
    }

    public void set_from(String _from) {
        this._from = _from;
    }

    public String get_subject() {
        return _subject;
    }

    public void set_subject(String _subject) {
        this._subject = _subject;
    } 
}

我通过代码将这个类称为：

Mail m = new Mail("UserName.gmail.com", "Password");

String[] toArr = {"demo.gmail.com"};
m.set_to(toArr);
m.set_from("UserName.gmail.com");
m.set_subject(sub);
m.setBody(finalbody);

try {
    if(m.send()) {
        Toast.makeText(EMailActivity.this, "Email was sent successfully.", Toast.LENGTH_LONG).show();
    } else {                    
    Toast.makeText(EMailActivity.this, "Email was not sent.", Toast.LENGTH_LONG).show();
    }
} catch(Exception e) {
}

我还包括了三个必需的 jar 文件：

activation.jar
additionnal.jar
mail.jar

现在的问题是：当我输入错误的用户名或密码时 -

Mail m = new Mail("UserName.gmail.com", "Password");

比没有发送邮件和屏幕锁定。由于屏幕被锁定，用户无法进一步移动。这是由于邮件没有发送。

那么有什么方法可以验证用户输入的用户名和密码。或者如果用户名或密码错误，如何防止屏幕锁定并在此之后执行任何操作。

Answer 1

不，现在不存在这种类型的方法或 api。