使用JavaMail从Gmail读取问题

我在使用javamail从Gmail（POP3）读取邮件时遇到问题。如果邮件是从Ubuntu的Thnderbird发送的，我有一个完美的代码。如果邮件最初是从Mac发送的，那么它会失败。使用JavaMail从Gmail读取问题

这是我的火腿使用的代码：

private static final String UNKNOWN_BRAND_PATH = "UNKNOWN"; 
public static final String FOLDER_NAME = "INBOX"; 

private static Logger LOG = org.slf4j.LoggerFactory.getLogger(LzMailRecieverService.class); 

@Value("${lz.mail.address}") 
private String lzMailUserName; 

@Value("${lz.mail.password}") 
private String lzMailPassword; 

@Value("${lz.mail.tmp.folder}") 
private String lzMailTmpFolder; 

public Store connect() throws Exception { 

    String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; 

    Properties pop3Props = new Properties(); 

    pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY); 
    pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false"); 
    pop3Props.setProperty("mail.pop3.port", "995"); 
    pop3Props.setProperty("mail.pop3.socketFactory.port", "995"); 

    URLName url = new URLName("pop3", "pop.gmail.com", 995, "", lzMailUserName, lzMailPassword); 

    Session session = Session.getInstance(pop3Props, null); 
    Store store = new POP3SSLStore(session, url); 
    store.connect(); 
    return store; 
} 

public Folder openFolder(Store store) throws MessagingException { 
    Folder folder = store.getDefaultFolder(); 
    folder = folder.getFolder(FOLDER_NAME); 
    folder.open(Folder.READ_ONLY); 
    return folder; 
} 

public List<MailDetails> readAttachement(Folder folder) throws IOException, MessagingException { 
    Message[] messages = folder.getMessages(); 
    List<MailDetails> mailDetails = new ArrayList<MailDetails>(); 
    for (Message message : messages) { 
     logMailDetails(message); 
     if (message.getContent() instanceof Multipart) { 
      Multipart multipart = (Multipart) message.getContent(); 
      for (int i = 0; i < multipart.getCount(); i++) { 
       BodyPart bodyPart = multipart.getBodyPart(i); 
       if (!Part.ATTACHMENT.equalsIgnoreCase(bodyPart.getDisposition())) { 

        continue; // dealing with attachments only 
       } 
       InputStream is = bodyPart.getInputStream(); 
       String uid = getUid(message); 
       String to = getTo(message); 
       String from = getFrom(message); 
       File d = new File(lzMailTmpFolder + File.separator + uid); 
       if (d.exists() == false) { 
        d.mkdir(); 
       } 
       File f = new File(d, new DateTime().getMillis() + "-" + bodyPart.getFileName()); 
       FileOutputStream fos = new FileOutputStream(f); 
       IOUtils.copy(is, fos); 
       MailDetails md = new MailDetails(to, from, f, uid); 
       mailDetails.add(md); 
      } 
     } 
     else { 
      LOG.warn("Message conteant is not Multipart " + message.getContentType() + " skipping ..."); 
     } 
    } 
    return mailDetails; 
} 

private String getFrom(Message message) throws MessagingException { 
    Address[] froms = message.getFrom(); 
    return froms[0].toString(); 
} 

private String getTo(Message message) throws MessagingException { 
    Address[] tos = message.getAllRecipients(); 
    return tos[0].toString(); 
} 

public void logMailDetails(Message m) throws MessagingException { 
    Address[] f = m.getFrom(); 
    if (f != null) { 
     for (int j = 0; j < f.length; j++) 
      LOG.debug("FROM: " + f[j].toString()); 
    } 

    Address[] r = m.getRecipients(Message.RecipientType.TO); 
    if (r != null) { 
     for (int j = 0; j < r.length; j++) { 
      LOG.debug("TO: " + r[j].toString()); 
     } 
    } 
    LOG.debug("SUBJECT: " + m.getSubject()); 
    Date d = m.getSentDate(); 
    LOG.debug("SendDate: " + d); 
} 

private String getUid(Message m) throws MessagingException { 
    try { 
     Address[] tos = m.getAllRecipients(); 
     String to = tos[0].toString(); 
     to = to.split("@")[0]; 
     String[] parts = to.split("\\+"); 
     return parts[parts.length - 1]; 
    } 
    catch (Exception e) { 
     LOG.error("Failes to extract brand hash from email address " + Lists.newArrayList(m.getFrom())); 
     return UNKNOWN_BRAND_PATH; 
    } 
}

的问题是，（）最初在MAC bodyPart.getDisposition创建的邮件总是返回null。无论我尝试了什么，我都无法理解哪部分是附件部分（这是我真正需要的：从邮件中提取附件）。

我已经看遍了整个网络，找出是什么原因，我没有找到答案。我怎么没有发现由克林斯曼Hoeller写下面的注意，表明有可能是这里的问题（详情点击这里：http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/mail/javamail/MimeMessageHelper.html）关于多邮件

警告：只包含HTML文本，但没有行内元素或附件的简单MIME邮件将在或多或少的任何能够HTML呈现的电子邮件客户端上工作。但是，内联元素和附件仍然是电子邮件客户端之间的主要兼容性问题：实际上不可能获得内联元素和附件在Microsoft Outlook，Lotus Notes和Mac Mail上工作。考虑为您的需求选择特定的多部分模式： MULTIPART_MODE常量上的javadoc包含更多详细信息。

如果邮件是从Mac发送的，有没有关于使用JavaMail的任何示例或探索？

yosi

来源

2013-02-28 yosi

使用JavaMail从Gmail读取问题

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