如何知道传入电子邮件的消息 ID 以获取消息内容

Question

我想获取传入电子邮件的消息 ID 以获取消息内容。我已应用此代码来侦听消息计数的变化。

folder.addMessageCountListener(new MessageCountListener() {

            public void messagesAdded(MessageCountEvent e) {
                System.out.println("Message Count Event Fired");
            }

            public void messagesRemoved(MessageCountEvent e) {
                System.out.println("Message Removed Event fired");
            }
        });

        folder.addMessageChangedListener(new MessageChangedListener() {

            public void messageChanged(MessageChangedEvent e) {
                System.out.println("Message Changed Event fired");
            }
        });

无论何时添加或删除消息，以上代码都适用于 IMAP 服务器。但我想知道哪些消息已被删除或添加。

请帮忙。完整的代码是，

主要活动：

String host = "imap.gmail.com";
String mailStoreType = "imap";
String username = "EmailAddress@gmail.com";
String password = "****";

CheckingMails.check(host, mailStoreType, username, password);

检查邮件：

public class CheckingMails {

public static void check(String host, String storeType, String user,
                         String password) {
   boolean supportsIdle = false;
        IMAPFolder folder = null;
        int freq = 2000;
        try {

            Properties props = System.getProperties();
            props.setProperty("mail.store.protocol", "imaps");
            Session session = Session.getDefaultInstance(props, null);
            final javax.mail.Store store = session.getStore("imaps");

            store.connect(host, user, password);

            folder = (IMAPFolder) store.getFolder("Inbox");
            folder.open(IMAPFolder.READ_WRITE);
            Log.d("fhjg43524318778", folder.toString());

            try {
                folder = (IMAPFolder) store.getFolder("Inbox");
                folder.open(IMAPFolder.READ_WRITE);
                SearchTerm sender = new FromTerm(new InternetAddress("zohaibsvu@gmail.com"));

                // Getting from specific email
                Message[] message = folder.search(sender);

                Log.d("fghjgh564", String.valueOf(message.length));

                for (int i = 1; i < message.length; i++) {
                    Message writePart = message[i];
                    int id = message[i].getMessageNumber();
                    String from = message[i].getFrom()[0].toString();
                    String subject = message[i].getSubject();
                    Log.d("dfgh3423", "# "+id+" From "+from+", subject "+subject);
                }
            } catch (AddressException  y) {

            } catch (MessagingException u) {

            }

        folder.addMessageCountListener(new MessageCountListener() {

            public void messagesAdded(MessageCountEvent e) {
                    Log.d("asfd3565678", "Message Count Event Fired");
            }

            public void messagesRemoved(MessageCountEvent e) {
                    Log.d("asfd3565678", "Message Count Event Fired");
            }
        });

        folder.addMessageChangedListener(new MessageChangedListener() {

            public void messageChanged(MessageChangedEvent e) {
                    Log.d("asfd3565678", "Message Count Event Fired");
            }
        });


        // Check mail once in "freq" MILLIseconds
        int freq = 2000;
        boolean supportsIdle = false;
        try {
            if (emailFolder instanceof IMAPFolder) {
                IMAPFolder f = (IMAPFolder) emailFolder;
                f.idle();
                supportsIdle = true;
            }
        } catch (FolderClosedException fex) {
            throw fex;
        } catch (MessagingException mex) {
            supportsIdle = false;
        }
        for (; ; ) {
            if (supportsIdle && emailFolder instanceof IMAPFolder) {
                IMAPFolder f = (IMAPFolder) emailFolder;
                f.idle();
                System.out.println("IDLE done");
            } else {
                Thread.sleep(freq); // sleep for freq milliseconds

                // This is to force the IMAP server to send us
                // EXISTS notifications.
                emailFolder.getMessageCount();
            }
        }



        /*
        // retrieve the messages from the folder in an array and print it
        Message[] messages = emailFolder.getMessages();
        System.out.println("messages.length---" + messages.length);

        for (int i = 0, n = messages.length; i < n; i++) {
            Message message = messages[i];
            System.out.println("---------------------------------");
            System.out.println("Email Number " + (i + 1));
            System.out.println("Subject: " + message.getSubject());
            System.out.println("From: " + message.getFrom()[0]);
            System.out.println("Text: " + message.getContent().toString());

        }

        */

        //close the store and folder objects
     //   emailFolder.close(false);
     //   store.close();

    } catch (NoSuchProviderException e) {
        e.printStackTrace();
    } catch (MessagingException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}





}

Answer 1

Message-ID 可通过 MimeMessage.getMessageID 方法访问。

如果您真的要询问 IMAP UID，可以通过 UIDFolder.getUID 方法访问。将 Folder 对象转换为 UIDFolder。

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