java email将参数值插入主题和消息

Question

我猜我需要一些相当常见的问题帮助。我正在使用.properties文件在我的java应用程序中定义一些静态文本。在这个.properties文件中，我已经定义了一个主题和一封邮件，我希望在特定情况下发送该邮件。所以这是我的application.properties文件的相关部分：

fail_msgToAddress = xxxx@yyyy.zzz
fail_msgSubject = [FAIL TO PROCESS EXAM] Study: %s for Patient %s could not be processed due to invalid examination codes
fail_msgText = <p>Case: %s, for patient: %s, failed to be processed since it seemed not to correspond to a valid examination type!</p><p> Please communicate with Npap lab for specific instructions</p>

在我的代码中，我想传递两个参数：学习ID和患者姓名，以电子邮件主题和消息。所以我设置了一些从我的属性文件中获取此信息的方法，并且我尝试使用String.format方法将一些参数值插入到文本中：

....
GlobalConfig cfg = new GlobalConfig();
String emailAddr = cfg.failMsgToAddress();
String emailSubj = cfg.failMsgSubject();
String emailTxt = cfg.failMsgText();
...
try {
    Notifier ntf = new Notifier();
    emailSubj = String.format("[FAIL TO PROCESS EXAM] Study: %s for Patient %s could not be processed due to invalid examination codes", d, dcSerMeta.getAnonymizationData(d).getPatientName());
    emailTxt = String.format(emailTxt, d, dcSerMeta.getAnonymizationData(d).getPatientName());
    ntf.sendMail(emailAddr, emailSubj, emailTxt);
    ....
}

其中Notifier是我的邮件包装类。它的sendMail方法是发送html电子邮件的经典实现。

我使用的是常见的javax.mail库，而Notifier.sendMail方法是：

public boolean sendMail(String msgToAddress, String msgSubject, String msgText) throws GeneralSecurityException {
    boolean result = false;

    GlobalConfig cfg = new GlobalConfig();

    smtpServer = cfg.getSmtpServer();
    smtpPort = Integer.parseInt(cfg.getSmtpPort());
    smtpUser = cfg.getSmtpUsername();
    smtpPassword = cfg.getSmtpPassword();
    emailSender = cfg.getSmtpSender();
    smtpProtocol = cfg.getSmtpProtocol();

    smtpSecure = ("0".equals(cfg.getSmtpSecure())) ? "false" : "true";

    log.info("###SMTP server: " + smtpServer + ", SMTP port: " + smtpPort + ", SMTP username: " + smtpUser + ", SMTP password: " + smtpPassword + ", email Sender: " + emailSender + ", smtpSecure: " + smtpSecure + ", smtpProtocol: " + smtpProtocol);
    Properties props = new Properties();

    MailSSLSocketFactory socketFactory = new MailSSLSocketFactory(); socketFactory.setTrustedHosts(new String[] { smtpServer });
    socketFactory.setTrustAllHosts(true);

    if("true".equals(smtpSecure)) {

        props.put("mail.transport.protocol", smtpProtocol);
        props.put("mail.smtps.host", smtpServer);
        props.put("mail.smtps.port", smtpPort);
        props.put("mail.smtps.ssl.enable", "false");
        props.put("mail.smtps.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtps.socketFactory", socketFactory);

    } else {

        props.put("mail.transport.protocol", smtpProtocol);
        props.put("mail.smtp.host", smtpServer);
        props.put("mail.smtp.port", smtpPort);
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.ssl.enable", "false");            
        props.put("mail.smtps.socketFactory", socketFactory);
    }

    Authenticator auth = new SMTPAuthenticator();

    javax.mail.Session mailSession = javax.mail.Session.getInstance(props, auth);

    mailSession.setDebug(true);
    Transport transport;
        try {
            transport = mailSession.getTransport();
            MimeMessage message = new MimeMessage(mailSession);
                try {
                    message.setSubject(msgSubject);
                    //message.setContent(msgText, "text/plain");
            message.setContent(msgText, "text/html" );
        message.setFrom(new InternetAddress(emailSender));
        message.addRecipient(Message.RecipientType.TO,
                        new InternetAddress(msgToAddress));

        transport.connect();
                transport.sendMessage(message,
                    message.getRecipients(Message.RecipientType.TO));
                transport.close();
                result = true;
            } catch (MessagingException e) {
                e.printStackTrace();
            }                 
        } catch (NoSuchProviderException e1) {
            e1.printStackTrace();
        }
        return result;
   }      

然而，String.format方法似乎不起作用，当我收到电子邮件时，我只是得到了＆＃39;％s＆＃39;而不是实际的参数值！我错过了什么？