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(Java) Reading Unread POP3 Email

The POP3 protocol does not provide the ability to ask the server which emails are "unread". Furthermore, a pure POP3 server does not even keep this information. Some servers, such as Exchange Server, expose both POP3 and IMAP interfaces. In these cases, information about read/unread status exists on the server, but it is only available via the IMAP protocol. Email clients such as Outlook and Thunderbird keep read/unread information on the client computer. This example demonstrates how UIDLs can be saved to track and read "unread" email.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  The mailman object is used for receiving (POP3)
    //  and sending (SMTP) email.
    CkMailMan mailman = new CkMailMan();

    //  Any string argument automatically begins the 30-day trial.
    boolean success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println("Component unlock failed");
        return;
    }

    //  Set the POP3 server's hostname
    mailman.put_MailHost("pop.someMailServer.com");

    //  Set the POP3 login/password.
    mailman.put_PopUsername("***");
    mailman.put_PopPassword("***");

    //  You may keep a list of already-seen UIDLs in a text file:
    //  If this is the first time you're running this example,
    //  create an empty text file named "seenUidls.txt";
    CkStringArray saSeenUidls = new CkStringArray();
    success = saSeenUidls.LoadFromFile("seenUidls.txt");
    if (success != true) {
        System.out.println("failed to load seenUidls.txt");
        return;
    }

    //  Get the complete list of UIDLs on the mail server.
    CkStringArray saUidls;
    saUidls = mailman.GetUidls();

    if (saUidls == null ) {
        System.out.println(mailman.lastErrorText());
        return;
    }

    //  Create a new string array object (it's an object, not an actual array)
    //  and add the UIDLs from saUidls that aren't already seen.
    CkStringArray saUnseenUidls = new CkStringArray();

    int i;
    int n;
    n = saUidls.get_Count();
    for (i = 0; i <= n - 1; i++) {
        if (saSeenUidls.Contains(saUidls.getString(i)) != true) {
            success = saUnseenUidls.Append(saUidls.getString(i));
        }

    }

    if (saUnseenUidls.get_Count() == 0) {
        System.out.println("No unseen emails!");

        return;
    }

    //  Download in full the unseen emails:
    CkEmailBundle bundle;

    bundle = mailman.FetchMultiple(saUnseenUidls);
    if (bundle == null ) {
        System.out.println(mailman.lastErrorText());

        return;
    }

    CkEmail email;
    for (i = 0; i <= bundle.get_MessageCount() - 1; i++) {
        email = bundle.GetEmail(i);
        System.out.println(email.ck_from());
        System.out.println(email.subject());
        System.out.println("----");

    }

    //  Save saUidls to "seenUidls.txt";
    success = saUidls.SaveToFile("seenUidls.txt");


  }
}

 

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