java - 如何在我的应用程序中使用 javamail API 发送邮件正文中的超链接？

Question

我需要在我的应用程序中向用户发送验证电子邮件，并且在该邮件中我想发送一个 url 作为超链接，我能够成功发送电子邮件，但我不知道如何在正文中发送超链接。

我向用户发送电子邮件的代码:-

class SendEmailAsyncTask extends AsyncTask<Void, Void, Boolean> {

String emailid = "email="+user_email+"&hash="+randomcode;
String link = "http://www.google.com"+emailid;
String body = "Please verify your email address by clicking on this link "+link ;

 Mail m = new Mail("abc@gmail.com", "abc@123");

 public SendEmailAsyncTask() {
 if (BuildConfig.DEBUG)
    Log.v(SendEmailAsyncTask.class.getName(), "SendEmailAsyncTask()");
String[] toArr = {user_email};
m.setTo(toArr);
m.setFrom("abc@gmail.com");
m.setSubject(subject);
m.setBody(body);
}

@Override
protected void onPreExecute() {
    super.onPreExecute();


}

@Override
protected Boolean doInBackground(Void... params) {
    if (BuildConfig.DEBUG) Log.v(SendEmailAsyncTask.class.getName(), "doInBackground()");

    try {
        m.send();

        Handler handler = new Handler(Looper.getMainLooper());

        handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                Toast.makeText(SignupActivity.this, "Email Sent", Toast.LENGTH_SHORT).show();

            }
        }, 1000 );



        return true;


    } catch (AuthenticationFailedException e) {
        Log.e(SendEmailAsyncTask.class.getName(), "Bad account details");

        Handler handler = new Handler(Looper.getMainLooper());

        handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                Toast.makeText(SignupActivity.this, "Incorrect account details", Toast.LENGTH_SHORT).show();

            }
        }, 1000 );


        e.printStackTrace();

        statusDialog.setMessage("Account Details are not correct");
        return false;
    } catch (MessagingException e) {

        Handler handler = new Handler(Looper.getMainLooper());

        handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                Toast.makeText(SignupActivity.this, "Email sending failed", Toast.LENGTH_SHORT).show();

            }
        }, 1000 );



        e.printStackTrace();

        return false;
    } catch (Exception e) {
        e.printStackTrace();

        return false;
    }
}


@Override
protected void onPostExecute(Boolean aBoolean) {
    super.onPostExecute(aBoolean);

}
}

这是我的 Mail.class :-

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;



    static {
        Security.addProvider(new JSSEProvider());
    }




    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 void setTo(String[] toArr) {
        // TODO Auto-generated method stub
        this._to=toArr;
    }

    public void setFrom(String string) {
        // TODO Auto-generated method stub
        this._from=string;
    }

    public void setSubject(String string) {
        // TODO Auto-generated method stub
        this._subject=string;
    }

    // more of the getters and setters …..
}

请指导我如何在后台发送的电子邮件的消息正文中发送文本和超链接。

Answer 1

确保您使用的是官方 JavaMail for Android .

然后，修复这些 common JavaMail mistakes .

要发送可点击的链接，请发送 HTML 电子邮件。将 _body 设置为包含您希望在消息中包含的 html 内容的字符串。将设置消息正文的代码更改为:

        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setText(_body, "utf-8", "html");