Java

Save an Email to a Temporary MHT File

Demonstrates the Chilkat Email.CreateTempMht method, which prepares the email for display in a web browser and saves it as a temporary MHT file, returning the path that was written. If the filename argument is empty, Chilkat chooses a temporary filename.

To make the message viewable as a standalone web page, the method transforms it: all attachments are dropped; if the email has both HTML and plain-text alternatives, the plain-text alternative is dropped; and if the email has only a plain-text body, it is converted to HTML. This example loads an HTML email and creates the temporary MHT.

Background: MHT (MIME HTML) is a single-file web-page-archive format — it packs an HTML document together with its images and style sheets into one file, which is essentially what an HTML email already is. Because a Windows WebBrowser control can navigate directly to an .mht file, writing the message out as MHT is a quick way to render a received email, inline images and all, inside a desktop application. The transformations (dropping attachments, keeping just the HTML representation) ensure the result is a clean, self-contained page. For unpacking to loose files served by a web application instead, see AspUnpack.

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

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the CreateTempMht method, which prepares the email for viewing in a browser
        // and saves it as a temporary MHT (MIME HTML) file, returning the file path.
        //
        // To produce browser-viewable output, CreateTempMht transforms the message: it drops all
        // attachments; if the email has both HTML and plain-text alternatives it drops the
        // plain-text alternative; and if the email has only a plain-text body it converts that
        // body to HTML.  Passing an empty filename lets Chilkat choose a temporary filename.

        Email email = new Email();

        try {
            email.loadEml("qa_data/eml/html_with_images.eml");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Transform the email for browser display and save it as a temporary MHT file
        // (empty filename = auto-generated temp file).
        String mhtPath = email.createTempMht("");

        System.out.println("Temporary MHT file: " + mhtPath);

        // Note: The path "qa_data/..." is a relative local filesystem path,
        // relative to the current working directory of the running application.
    }
}