android后臺發送郵件

public class SendEmail {
    private static final String TAG = "SendEmail";
    //要發送Email地址
    private String mailTo = null;
    //郵件發送來源地址
    private String mailFrom = null;
    //SMTP主機地址
    private String smtpHost = null;
    //是否啟用調試
    private boolean debug = false;


private String messageBasePath = null;
//Email主題
private String subject;

public void setMailTo(String mailTo) {
    this.mailTo = mailTo;
}

public void setMailFrom(String mailFrom) {
    this.mailFrom = mailFrom;
}

public void setSmtpHost(String smtpHost) {
    this.smtpHost = smtpHost;
}

public void setDebug(boolean debug) {
    this.debug = debug;
}

public void setMessageBasePath(String messageBasePath) {
    this.messageBasePath = messageBasePath;
}

public void setSubject(String subject) {
    this.subject = subject;
}

public void setMsgContent(String msgContent) {
    this.msgContent = msgContent;
}

public void setAttachedFileList(Vector attachedFileList) {
    this.attachedFileList = attachedFileList;
}

public void setEmailAccount(String emailAccount) {
    this.emailAccount = emailAccount;
}

public void setEmailPwd(String emailPwd) {
    this.emailPwd = emailPwd;
}

public void setMessageContentType(String messageContentType) {
    this.messageContentType = messageContentType;
}

public void setEmailbccTo(String emailbccTo) {
    this.emailbccTo = emailbccTo;
}

public void setEmailccTo(String emailccTo) {
    this.emailccTo = emailccTo;
}

//Email內容
private String msgContent;

private Vector attachedFileList;
private String emailAccount = null;
private String emailPwd = null;
private String messageContentType = "text/html;charset=utf-8";

private String emailbccTo = null;
private String emailccTo = null;

/*
默認構造函數
 */
public SendEmail() {
    super();
}

private void writeEmail(Session session, Message message) throws MessagingException {
    String fileName;
    Multipart multipart = new MimeMultipart();
    //設定發件人地址
    if (mailFrom != null) {
        message.setFrom(new InternetAddress(mailFrom));
        Log.i(TAG, "發件人郵件地址：" + mailFrom);
    } else {
        Log.i(TAG, "沒有指定發件人郵件地址");
        return;
    }
    //設定收件人地址
    if (mailTo != null) {
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
        Log.i(TAG, "收件人郵件地址：" + mailTo);
    } else {
        Log.i(TAG, "沒有指定收件人郵件地址");
        return;
    }
    //設定抄送地址
    if (emailccTo != null) {
        message.setRecipient(Message.RecipientType.CC, new InternetAddress(emailccTo));
        Log.i(TAG, "抄送郵件地址：" + emailccTo);
    } else {
        Log.i(TAG, "沒有指定抄送郵件地址");
        return;
    }
    //設定密送地址
    if (emailbccTo != null) {
        message.setRecipient(Message.RecipientType.BCC, new InternetAddress(emailbccTo));
        Log.i(TAG, "密送郵件地址：" + emailbccTo);
    } else {
        Log.i(TAG, "沒有指定密送郵件地址");
        return;
    }
    //設置郵件主題
    message.setSubject(subject);
    Log.i(TAG, "郵件主題:" + subject);
    //設置回復地址
    message.setReplyTo(new InternetAddress[]{new InternetAddress(mailFrom)});
    //創建并設置第一部分
    MimeBodyPart bodyPart = new MimeBodyPart();
    if (msgContent != null) {
        Log.i(TAG, "郵件內容:" + msgContent);
        bodyPart.setContent(msgContent, messageContentType);
    } else {
        bodyPart.setContent("", messageContentType);
    }
    multipart.addBodyPart(bodyPart);
    //附件文件到郵件中
    if (attachedFileList != null) {
        for (Enumeration fileList = attachedFileList.elements(); fileList.hasMoreElements(); ) {
            fileName = (String) fileList.nextElement();
            MimeBodyPart mBodyPart = new MimeBodyPart();

            FileDataSource fds = new FileDataSource(messageBasePath + fileName);
            Log.i(TAG, "Email發送的附件為:" + messageBasePath + fileName);
            mBodyPart.setDataHandler(new DataHandler(fds));
            mBodyPart.setFileName(fileName);
            multipart.addBodyPart(mBodyPart);
        }
    }
    Log.i(TAG, "設置郵件部分");
    message.setContent(multipart);
    message.setSentDate(new Date());
}

/**
 * 發送郵件方法
 *
 * @return true 表示發送成功,false表示不成功
 */
public boolean sendEmail() {
    int loopCount;
    Properties properties = System.getProperties();
    properties.setProperty("mail.smtp.host", smtpHost);
    properties.setProperty("mail.smtp.auth", "true");
    properties.put("mail.smtp.port", "25");
    MailAuthenticator authenticator = new MailAuthenticator();
    Session session = Session.getInstance(properties, authenticator);
    session.setDebug(debug);
    MimeMessage mimeMessage = new MimeMessage(session);


//這里如果用Transport的話會出現錯誤
        SMTPTransport transport = new SMTPTransport(session, new URLName("smtp", "smtp.qq.com", 25, null, MailAuthenticator.TENCENT_EMAIL_USER, MailAuthenticator.TENCENT_EMAIL_PWD));
        try {
            writeEmail(session, mimeMessage);
            //transport = session.getTransport("smtp");
            try {
                Log.i(TAG, "開始連接服務器");
                transport.connect(smtpHost, 25, MailAuthenticator.TENCENT_EMAIL_USER, MailAuthenticator.TENCENT_EMAIL_PWD);
            } catch (AuthenticationFailedException e) {
                e.printStackTrace();
                Log.i(TAG, "連接服務器失敗");
                return false;
            } catch (MessagingException e) {
                e.printStackTrace();
                Log.i(TAG, "發送郵件過程中出現錯誤");
                return false;
            }
            Log.i(TAG, "開始發送郵件");
            transport.sendMessage(mimeMessage, mimeMessage.getAllRecipients());
            transport.close();
            Log.i(TAG, "關閉連接");
        } catch (MessagingException e) {
            e.printStackTrace();
            Log.i(TAG, "發送郵件失敗");
            return false;
        } finally {
            try {
                if (transport != null && transport.isConnected()) {
                    transport.close();
                    Log.i(TAG, "在finally中關閉連接");
                }
            } catch (MessagingException e) {
                e.printStackTrace();
            }
        }
        Log.i(TAG, "郵件發送成功");
        return true;
    }
}
tips---其中的MyAuthenticator類繼承自Authenticator,重寫這個方法即可
@Override
protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication(郵箱用戶名,密碼);
}</pre>