android - 使用适用于 Android 的 JavaMail API 发送 HTML 电子邮件

Question

我正在使用为 Android 移植的 JavaMail API 找到 here但我不知道如何用它发送 HTML 格式的电子邮件。

设置电子邮件的 Activity :

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.setContent(_body, "text/html"); 
  _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; 
} 

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

}

public void setFrom(String _from) {
this._from = _from;

}

public void setSubject(String _subject) {
this._subject = _subject;

}

public void setBody(Spanned string) {
this._body=string.toString();

}
} 

尝试发送电子邮件的 Activity :

Mail m = new Mail("email address", "password"); 

String[] toArr = {Email1, Email2}; 
m.setTo(toArr);  
m.setSubject("This is just a test"); 

String sb=("Android</br>Testing</br><b> test </b>");


m.setBody(Html.fromHtml(sb)); 

try { 
  m.addAttachment("/sdcard/+"Image1.PNG"); 

  if(m.send()) { 
    Toast.makeText(this, "Email was sent successfully.", Toast.LENGTH_LONG).show(); 
  } else { 
    Toast.makeText(this, "Email was not sent.", Toast.LENGTH_LONG).show(); 
  } 
} catch(Exception e) { 
  //Toast.makeText(MailApp.this, "There was a problem sending the email.",     Toast.LENGTH_LONG).show(); 
  Log.e("MailApp", "Could not send email", e); 
 } 
  }

Answer 1

在您的代码中，不要使用“text/html”，而只使用“text/html；charset=ISO-8859-1”。它应该工作。消息的字符串必须已经有 html 标签。例如……

BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent("my message in html <br /> <strong> text in bold </strong>", "text/html; charset=ISO-8859-1");

multipart.addBodyPart(messageBodyPart);