JavaMail 1.5.0 bug 或者 gmail 奇怪的问题？

Question

我正在尝试使用包装 javax.mail 的类(JavaMail 1.5.0)发送电子邮件。它使用 smtp.gmail.com 发送并且它可以工作，但是工作得很好，因为当我向多个收件人发送电子邮件时，每封电子邮件都会发送(TO + CC)次，所以如果我向 3 个收件人发送电子邮件，我会得到总计9 封电子邮件(每封重复 3 次)。

这不太好...设置 session 调试显示电子邮件已正确发送给正确的收件人 1 次。我使用的是 jre6u45。

有什么问题吗？有人有任何提示吗？我是否犯了一个我没有看到的愚蠢错误？

这是我的代码:

import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class Mailer 
{   
    public static boolean sendMail(
        final String username,
        final String password,
        final String from, 
        final String _tos,
        final String _ccs,
        final String _bccs,
        final String subject,
        final String text,
        final File[] attachments)
    {
        Properties   p           = null;
        Session      s           = null;
        boolean      debug       = true;
        boolean      res         = false;
        boolean      isSecured   = false;
        boolean      isSupported = true;
        String       host        = null;     
        final String charset     = "UTF-8";

        String fromProvider = from.split("@")[1];
        if(fromProvider.compareTo("gmail.com") == 0)
        {
            isSecured = true;
            host      = "smtp.gmail.com";
            p         = System.getProperties();
            p.put("mail.smtp.host",                host);
            p.put("mail.smtps.auth",               "true");
            p.put("mail.smtp.port",                "465");
            p.put("mail.smtp.starttls.enable",     "true");
            p.put("mail.smtp.socketFactory.port",  "465");
            p.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

            s = Session.getInstance(p, null);
        }
        else {isSupported = false;}

        if(isSupported)
        {
            s.setDebug(debug);

            try
            {
                // init
                MimeMessage email = new MimeMessage(s);
                Multipart   mp    = new MimeMultipart();
                InternetAddress[] tos  = {};
                InternetAddress[] ccs  = {};
                InternetAddress[] bccs = {};
                // common
                if(_tos  != null) {tos  = InternetAddress.parse(_tos);}
                if(_ccs  != null) {ccs  = InternetAddress.parse(_ccs);}
                if(_bccs != null) {bccs = InternetAddress.parse(_bccs);}
                email.addRecipients(RecipientType.TO,  tos);
                email.addRecipients(RecipientType.CC,  ccs);
                email.addRecipients(RecipientType.BCC, bccs);

                email.setSubject   (subject, charset);
                email.setSentDate  (Calendar.getInstance().getTime());

                // text part
                MimeBodyPart mbpText = new MimeBodyPart();
                mbpText.setText(text, charset, "html");
                mp.addBodyPart(mbpText);

                // attachments
                if(attachments != null && attachments.length > 0)
                {
                    for(int i=0; i<attachments.length; i++)
                    {
                        MimeBodyPart mbpAttachment = new MimeBodyPart();
                        mbpAttachment.attachFile(attachments[i]);
                        mp.addBodyPart(mbpAttachment);
                    }
                }
                // build elements
                email.setContent(mp);
                email.saveChanges();
                Address[] addresses = email.getAllRecipients();                
                // send
                Transport.send(email, addresses, username, password);

                res = true;
            }
            catch(MessagingException ex) {ex.printStackTrace();}
            catch(IOException ex)        {ex.printStackTrace();}
        }
        return res;
    }
}

Answer 1

由于我们不知道您正在执行什么代码，因此只能在这里进行猜测。也许您将邮件添加到所有 ReciptentType 中？

            email.addRecipients(RecipientType.TO,  tos);
            email.addRecipients(RecipientType.CC,  ccs);
            email.addRecipients(RecipientType.BCC, bccs);

我建议您打印出地址数组。如果该数组多次包含邮件，我将开始查找它们是从哪里添加的。