电子邮件发送用户名密码的验证

Question

我正在开发一个从其发送电子邮件的应用程序。为了发送电子邮件，我使用了无意识代码的代码。因为这是应用程序的需要。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; 
    } 
} 

我叫这个类的代码如下：

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) { 
} 

我还包括三个必需的jar文件如：

activation.jar 
additionnal.jar 
mail.jar 

现在问题是：当我输入错误的用户名或密码行 -

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

比没有邮件发送和屏幕锁定。屏幕锁定时用户不能移动得更远。这是由于邮件不发送。

所以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，那么我怎样才能防止屏幕锁定并在此之后执行任何操作。

Answer 1

不，现在没有这种类型的方法或api。