(Java) Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux 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[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkImap imap = new CkImap();

    // Connect to an IMAP server.
    // Use TLS
    imap.put_Ssl(true);
    imap.put_Port(993);
    success = imap.Connect("imap.example.com");
    if (success == false) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Login
    success = imap.Login("***","***");
    if (success == false) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success == false) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // After selecting the mailbox. the total number of emails
    // is immediately available:
    int totalNum = imap.get_NumMessages();
    System.out.println("Num messages = " + totalNum);

    // To determine the number of unseen messages, a call
    // to Search is required, which returns the set of UIDs
    // of all unseen messages.

    // We can choose to fetch UIDs or sequence numbers.
    boolean fetchUids = true;
    CkMessageSet messageSet = new CkMessageSet();
    success = imap.QueryMbx("UNSEEN",fetchUids,messageSet);
    if (success == false) {
        System.out.println(imap.lastErrorText());
        return;
        }

    int numUnseen = messageSet.get_Count();
    System.out.println(numUnseen);

    System.out.println("UIDs ----");

    // Display the UIDs
    int i = 0;
    while (i < messageSet.get_Count()) {
        System.out.println(messageSet.GetId(i));
        i = i+1;
        }

    // Disconnect from the IMAP server.
    success = imap.Disconnect();
  }
}