Java

Add a Related String Resource to an Email

Demonstrates the Chilkat Email.AddRelatedString method, which adds a text-based related MIME resource, such as a style sheet, from an in-memory string and returns the generated Content-ID. The first argument is the MIME resource name, the second is the text content, and the third is the charset used to encode it. Because the Content-ID is generated by the call, this example adds the style sheet first, then builds an HTML body in a StringBuilder that references the style sheet by that cid:, and passes the result to SetHtmlBody.

Background: Related items are not always images loaded from disk — sometimes the resource is text you already have in memory, like a generated CSS style sheet or an SVG. AddRelatedString lets you embed such content directly without writing a temporary file first. As with other related items, it lives in the multipart/related enclosure and is referenced from the HTML by the Content-ID the method returns.

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

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the AddRelatedString method, which adds a text-based related MIME resource
        // (such as a style sheet) from an in-memory string and returns the generated Content-ID.
        // The first argument is the resource name, the second is the text content, the third is the charset.

        Email email = new Email();
        email.setSubject("Email with a related style sheet");

        // Add the text-based related resource first; capture the generated Content-ID.
        String cid;
        try {
            cid = email.addRelatedString("styles.css", "body { color: navy; }", "utf-8");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Build the HTML body, referencing the related style sheet by its Content-ID.  A
        // placeholder is used and then replaced with the actual Content-ID.
        StringBuilder sbHtml = new StringBuilder();
        sbHtml.append("<html><head><link rel=\"stylesheet\" href=\"cid:PLACEHOLDER_CID\"/></head><body>Styled content.</body></html>");
        int numReplaced = sbHtml.replace("PLACEHOLDER_CID", cid);
        email.setHtmlBody(sbHtml.getAsString());

        System.out.println("Related Content-ID = " + cid);
        System.out.println("NumRelatedItems = " + email.getNumRelatedItems());
    }
}