pop3을 사용하여 날짜의 내림차순으로 메일 가져 오기

Question

나는 모든 전자 메일을 오름차순으로 가져 왔으며 마지막 날짜에 따라 검색된 메일을 의미합니다. 나는 그 반대가 필요하다.

public void downloadEmailAttachments(String host, int port,String userName, String password) 
    { 
    Properties properties = new Properties(); 
    properties.put("mail.pop3.host", host); 
    properties.put("mail.pop3.port", port); 
    properties.put("mail.pop3.user",userName); 
    properties.put("mail.password",password); 
    properties.setProperty("mail.pop3.socketFactory.class", 
      "javax.net.ssl.SSLSocketFactory"); 
    properties.setProperty("mail.pop3.socketFactory.fallback", "false"); 
    properties.setProperty("mail.pop3.socketFactory.port", 
      String.valueOf(port)); 

    Session session = Session.getDefaultInstance(properties); 

    try { 
     Store store = session.getStore("pop3"); 
     store.connect(host,userName, password); 

     Folder folderInbox = store.getFolder("INBOX");   
     folderInbox.open(Folder.READ_ONLY);    
     Message[] arrayMessages = folderInbox.getMessages(); 
     for (int i = 0; i < arrayMessages.length; i++) //max=puruna date=after,min=ajika date... 
     { 
      if (arrayMessages[i].getSentDate().after(maxDate) && arrayMessages[i].getSentDate().before(minDate)) 
      { 
      Message message = arrayMessages[i];   
      Address[] fromAddress = message.getFrom(); 
      String from = fromAddress[0].toString(); 
      Address[]toAdress=message.getAllRecipients(); 
      String to=toAdress[0].toString(); 
      String subject = message.getSubject(); 
      String sentDate = message.getSentDate().toString(); 
      String contentType = message.getContentType().toString(); 
      String messageContent = ""; 
      String attachFiles = ""; 

      if (contentType.contains("multipart")) { 
       // content may contain attachments 
       Multipart multiPart = (Multipart) message.getContent(); 
       int numberOfParts = multiPart.getCount(); 
       for (int partCount = 0; partCount < numberOfParts; partCount++) { 
        MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(partCount); 
        if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) { 
         // this part is attachment 
         String fileName = part.getFileName(); 
         attachFiles += fileName + ", "; 
         part.saveFile(saveDirectory + File.separator + fileName); 

        } else { 
         // this part may be the message content 
         messageContent = part.getContent().toString(); 
        } 
       } 

       if (attachFiles.length() > 1) { 
        attachFiles = attachFiles.substring(0, attachFiles.length() - 2); 
       } 
      } else if (contentType.contains("text/plain") 
        || contentType.contains("text/html")) { 
       Object content = message.getContent(); 
       if (content != null) { 
        messageContent = content.toString(); 
       } 

      } 

      System.out.println("Message #" + (i + 1) + ":"); 
      System.out.println("\t From: " + from); 
      System.out.println("\t to: " + to); 
      System.out.println("\t Subject: " + subject); 
      System.out.println("\t Sent Date: " + sentDate); 
      System.out.println("\t Message: " + messageContent); 
      System.out.println("\t Attachments: " + attachFiles); 
     } 

      new EmailAttachmentReceiver().setSaveDirectory(saveDirectory); 
     } 
     folderInbox.close(false); 
     store.close(); 
     } 

Answer 1

당신은 과정

Message[] arrayMessages = folderInbox.getMessages(); 

Comparator<Message> messageComparator = new Comparator<Message>({ 
    public int compare(Message m1, Message m2) { 
     if (m1.getSentDate() == null || m2.getSentDate() == null) 
     return 0; 
     return m2.getSentDate().compareTo(m1.getSentDate()); 
    } 
}); 

Arrays.sort(arrayMessages, messageComparator); 

을 정렬 Comparator을 사용할 수 있습니다