在Java中打印变量值

Question

我有一个对象,这是一个新的MimeMessage调用消息,我想知道它传递给我的外发邮件服务器.然而,我不知道如何在Java中获得这样的变量.这是一些代码:

private String sendConfirmationEmail (String to, String from, String subject, String body, boolean CCSender) {
      try
      {
  //            String smtpHost = Properties.smtp;
          String smtpHost = Properties.smtp;      
          String fromAddress = from;
          String toAddress = to;

          Properties properties = System.getProperties();
          properties.put("mail.smtp.host", smtpHost);

          Session session = Session.getInstance(properties, null);

          MimeMessage message = new MimeMessage(session);

          message.setFrom(new InternetAddress(fromAddress));
          message.setRecipient(Message.RecipientType.TO,
                  new InternetAddress(toAddress));

          if (CCSender) {
            message.setRecipient(Message.RecipientType.CC,
                    new InternetAddress(from));
          }
          message.setSubject(subject);
          message.setText(body);

          System.out.println(message); <=== I want this to work!

          message.saveChanges();
          Transport.send(message);
          return "1:success";
      }
      catch(Exception e)
      {
          return "0:failure "+e.toString();
      }
  }

任何帮助将非常感激.

谢谢.

Answer 1

如果它是您可以控制的类,则覆盖它的toString()方法

如果你无法控制它,你将不得不写一个像这样的方法

String valueOf(Message message) {
    StringBuilder sb = new StringBuilder();
    sb.append(message.someValue());
    sb.append(message.someOtherValue());
    return sb.toString();
}

并在调试消息中使用valueOf

对于MimeMessage,我依赖于它的内容具有toString实现

String valueOf(Message message) {
    return message.getContent().toString();
}