(Java) Load .eml and Examine the Structure, Attachments, and Related Items

Demonstrates how to load examine the MIME structure of a .eml, and also examine the attachment and related item filenames, attached messages, and multipart/report and DSN information.

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

    String emlPath = "C:/AAWorkarea/beatrix/roesner.eml";

    CkMime mime = new CkMime();

    boolean success = mime.LoadMimeFile(emlPath);
    if (success != true) {
        System.out.println(mime.lastErrorText());
        return;
        }

    System.out.println("---- MIME structure ----");
    System.out.println(mime.getStructure("text"));
    System.out.println("------------------------");

    CkEmail email = new CkEmail();
    success = email.LoadEml(emlPath);

    // Was this a signed and/or encrypted email?
    // If so, then loading the .eml automatically unwraps
    // (i.e. verifies signatures and decrypts) and the resultant
    // email is what existed prior to signing/encrypting.
    System.out.println("Email was Signed: " + email.get_ReceivedSigned());
    System.out.println("Email was Encrypted: " + email.get_ReceivedEncrypted());
    if (email.get_ReceivedSigned() == true) {
        System.out.println("Signature(s) valid = " + email.get_SignaturesValid());
        }

    if (email.get_ReceivedEncrypted() == true) {
        System.out.println("Decrypted successfully = " + email.get_Decrypted());
        }

    int i = 0;
    int numAttach = email.get_NumAttachments();
    System.out.println("Number of attachments = " + numAttach);

    while (i < numAttach) {
        System.out.println("---- Attachment " + i);

        // Examine the filename (if any)
        System.out.println("filename: " + email.getAttachmentFilename(i));
        // Examine the content-ID (if any)
        System.out.println("Content-ID: " + email.getAttachmentContentID(i));
        // Examine the content-type
        System.out.println("Content-Type: " + email.getAttachmentContentType(i));
        // Examine the content-disposition
        System.out.println("Content-Disposition" + email.getAttachmentHeader(i,"content-disposition"));
        // Examine the attachment size:
        System.out.println("Size (in bytes) of the attachment: " + email.GetAttachmentSize(i));

        i = i+1;
        }

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

    // Now for the related items.

    // Note: A MIME sub-part can potentially be both a related item AND an attachment.
    // The typical case is when the item is contained under the multipart/related enclosure and 
    // the item also has a "Content-Disposition" header indicating "attachment".
    // The location within multipart/related makes it a "related item", yet the Content-Disposition can also make it semantically an attachment.
    // Related items and attachments are not necessarily mutually exclusive.

    int numRelated = email.get_NumRelatedItems();
    System.out.println("Number of related items = " + numRelated);
    i = 0;
    while (i < numRelated) {
        System.out.println("---- Related Item " + i);

        // Examine the filename (if any)
        System.out.println("filename: " + email.getRelatedFilename(i));
        // Examine the content-ID (if any)
        System.out.println("Content-ID: " + email.getRelatedContentID(i));
        // Examine the content-type
        System.out.println("Content-Type: " + email.getRelatedContentType(i));
        // Examine the content-location (if any)
        System.out.println("Content-Location" + email.getRelatedContentLocation(i));

        i = i+1;
        }

    // The email could also have attached messages.
    // An attached message is another email that was attached to this email.
    int numAttachedMessages = email.get_NumAttachedMessages();
    System.out.println("Number of attached messages = " + numAttachedMessages);
    i = 0;
    while (i < numAttachedMessages) {
        System.out.println("---- Attached message " + i);

        // Examine the attached email
        CkEmail em = email.GetAttachedMessage(i);
        System.out.println("from: " + em.ck_from());
        System.out.println("subject: " + em.subject());

        i = i+1;
        }

    // An email could also be a multipart/report email. 
    // This is a DSN (Delivery Status Notification)
    // The NumReports property indicates how many "reports" exist.
    int numReports = email.get_NumReports();
    i = 0;
    System.out.println("Number of reports = " + numReports);
    i = 0;
    while (i < numReports) {
        System.out.println("---- Report " + i);
        // Get the raw report data...
        System.out.println(email.getReport(i));
        i = i+1;
        }

    // If the email is a multipart/report, then the information
    // from the message/delivery-status part of the email can be retrieved:
    if (email.IsMultipartReport() == true) {

        System.out.println("--- Delivery Status Information:");
        System.out.println("Status: " + email.getDeliveryStatusInfo("Status"));
        System.out.println("Action: " + email.getDeliveryStatusInfo("Action"));
        System.out.println("Reporting-MTA: " + email.getDeliveryStatusInfo("Reporting-MTA"));

        CkStringArray sa = email.GetDsnFinalRecipients();
        int numFinalRecipients = sa.get_Count();
        i = 0;
        while (i < numFinalRecipients) {
            System.out.println("final recipient: " + sa.getString(i));
            i = i+1;
            }

        }
  }
}