(Java) Scan for Emails with Attachments and Save Attachments to Files

Scan for emails with attachments and save attachments.

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

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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("myLogin","myPassword");
    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;
        }

    // We can choose to fetch UIDs or sequence numbers.
    boolean fetchUids = true;

    // Get the message IDs of all the emails in the mailbox
    CkMessageSet messageSet = new CkMessageSet();
    success = imap.QueryMbx("ALL",fetchUids,messageSet);
    if (success == false) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Fetch the email headers into a bundle object:
    CkEmailBundle bundle = new CkEmailBundle();
    boolean headersOnly = true;
    success = imap.FetchMsgSet(headersOnly,messageSet,bundle);
    if (success == false) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Scan for emails with attachments, and save the attachments
    // to a sub-directory.
    CkEmail fullEmail = new CkEmail();
    CkEmail emailHeader = new CkEmail();
    int i = 0;
    while (i < bundle.get_MessageCount()) {
        // The bundle contains email headers..
        bundle.EmailAt(i,emailHeader);

        // Does this email have attachments?
        // Use GetMailNumAttach because the attachments
        // are not actually in the email object because
        // we only downloaded headers.
        int numAttach = imap.GetMailNumAttach(emailHeader);

        if (numAttach > 0) {
            // Download the entire email and save the
            // attachments. (Remember, we 
            // need to download the entire email because
            // only the headers were previously downloaded.

            // The ckx-imap-uid header field is added when
            // headers are downloaded.  This makes it possible
            // to get the UID from the email object.
            String uidStr = emailHeader.getHeaderField("ckx-imap-uid");
            int uid = Integer.toString(uidStr);

            success = imap.FetchEmail(false,uid,true,fullEmail);
            if (success == false) {
                System.out.println(imap.lastErrorText());
                return;
                }

            success = fullEmail.SaveAllAttachments("attachmentsDir");

            int j;
            for (j = 0; j <= numAttach - 1; j++) {
                String filename = imap.getMailAttachFilename(emailHeader,j);
                System.out.println(filename);
                }

            }

        i = i+1;
        }

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