(Java) Create Non-Multipart Email with XML Body that is an Attachment

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Creates an email where the only body is a binary WAV file. The technique used in the example could be applied to other binary files, such as PDF, MS-WORD docs, Excel docs, etc.

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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.

    // The goal of this example is to create an email that has this MIME format,
    // where the body of the email is XML using base64 encoding, 
    // and the Content-Type and Content-Disposition are set as indicated.

    // Date: Wed, 23 Aug 2023 09:01:52 +0200 (CEST)
    // From: joe@example1.com
    // Subject: [v=EMCS.NL][a=NL****][k=****][s=0]
    // To: mary@example2.com
    // MIME-Version: 1.0
    // Content-Type: application/octet-stream; charset=us-ascii; name=6bd8dfe259b3a42c90a28a82b5fc6e77.txt
    // Content-Transfer-Encoding: Base64
    // Content-Disposition: attachment; filename=6bd8dfe259b3a42c90a28a82b5fc6e77.txt
    // Message-Id: <......>
    // 
    // <multi-line base64 encoded XML here>

    boolean success = true;

    String xmlBody = "<ie:IE801 xmlns:ie=\"urn:publicid:-:EC:DGTAXUD:EMCS:PHASE4:IE801:V3.01\" xmlns:tms=\"urn:publicid:-:EC:DGTAXUD:EMCS:PHASE4:TMS:V3.01\">....</ie:IE801>";

    CkEmail email = new CkEmail();

    // Add subject, TO, FROM, etc.
    email.put_Subject("[v=EMCS.NL][a=NL****][k=****][s=0]");
    email.put_From("joe@example1.com");
    success = email.AddTo("Mary","mary@example2.com");

    email.put_Body(xmlBody);

    email.AddHeaderField("Content-Transfer-Encoding","Base64");
    email.AddHeaderField("Content-Type","application/octet-stream; charset=us-ascii; name=6bd8dfe259b3a42c90a28a82b5fc6e77.txt");
    email.AddHeaderField("Content-Disposition","attachment; filename=6bd8dfe259b3a42c90a28a82b5fc6e77.txt");

    // Your email is ready to send
    CkMailMan mailman = new CkMailMan();

    mailman.put_SmtpHost("smtp.my_mail_server.com");
    mailman.put_SmtpUsername("myUsername");
    mailman.put_SmtpPassword("myPassword");
    mailman.put_SmtpPort(465);
    mailman.put_SmtpSsl(true);
    mailman.put_StartTLS(true);

    success = mailman.SendEmail(email);
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    success = mailman.CloseSmtpConnection();
    if (success != true) {
        System.out.println("Connection to SMTP server not closed cleanly.");
        }

    System.out.println("Mail Sent!");
  }
}