Java

Get a Header Attribute of an Attached Message

Demonstrates the Chilkat Email.GetAttachedMessageAttr method, which returns a header-field attribute value for the Nth attached (embedded) email. The first argument is the zero-based attached-message index, the second is the header field name, and the third is the attribute name. This example attaches an email and reads the filename attribute of its Content-Disposition header.

Background: MIME header fields can carry named attributes (parameters) after the main value — for example Content-Disposition: attachment; filename="report.eml", where filename is an attribute. Rather than parsing the raw header yourself, this method extracts a single named attribute from a chosen header of a specific embedded message, which is convenient when a message forwards other emails as nested message/rfc822 parts.

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Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the GetAttachedMessageAttr method, which returns a header-field attribute
        // value for the Nth attached (embedded) email.  The first argument is the zero-based
        // attached-message index, the second is the header field name, and the third is the attribute name.

        // Build an inner email to attach.
        Email innerEmail = new Email();
        innerEmail.setSubject("Embedded message");
        innerEmail.setFrom("alice@example.com");
        innerEmail.addTo("Bob", "bob@example.com");

        // Attach it to an outer email as a message/rfc822 part.
        Email email = new Email();
        email.setSubject("Has an attached message");
        try {
            email.attachEmail(innerEmail);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Get the "filename" attribute of the "Content-Disposition" header of the first
        // attached message (index 0).
        String fname = email.getAttachedMessageAttr(0, "Content-Disposition", "filename");
        System.out.println("Attached message filename attribute: " + fname);
    }
}