Java

Send HTML Email with External CSS as Related Item

See more SMTP Examples

Demonstrates how to compose an HTML email with an external CSS file included as a related item and referenced by CID (Content-ID). Chilkat2 Java

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

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // The mailman object is used for sending and receiving email.
        MailMan mailman = new MailMan();

        // Use your SMTP server hostname.  This example uses office365, but it could be any SMTP server..
        mailman.setSmtpHost("outlook.office365.com");
        mailman.setSmtpPort(587);
        mailman.setStartTLS(true);

        // Set the SMTP login/password
        mailman.setSmtpUsername("OFFICE365-SMTP-LOGIN");
        mailman.setSmtpPassword("OFFICE365-SMTP-PASSWORD");

        // Create a new email object
        Email email = new Email();
        email.setSubject("HTML Email with embedded CSS");
        email.setFrom("Chilkat Support <my-office365-user@mydomain.com>");
        email.addTo("Chilkat Support", "support@chilkatsoft.com");

        StringBuilder sbCss = new StringBuilder();
        boolean bCrlf = true;
        sbCss.appendLine("body {", bCrlf);
        sbCss.appendLine("    background-color: powderblue;", bCrlf);
        sbCss.appendLine("}", bCrlf);
        sbCss.appendLine("h1 {", bCrlf);
        sbCss.appendLine("    color: blue;", bCrlf);
        sbCss.appendLine("}", bCrlf);
        sbCss.appendLine("p {", bCrlf);
        sbCss.appendLine("    color: red;", bCrlf);
        sbCss.appendLine("}", bCrlf);

        // It's possible to add a CSS file directly by calling AddRelatedFile.
        // This example will add the CSS from a string.
        String filenameInHtml = "styles.css";
        String contentIdCss;
        try {
            contentIdCss = email.addRelatedString(filenameInHtml, sbCss.getAsString(), "utf-8");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The src attribute for the image tag is set to the contentIdCss:
        StringBuilder sbHtml = new StringBuilder();
        sbHtml.appendLine("<!DOCTYPE html>", bCrlf);
        sbHtml.appendLine("<html>", bCrlf);
        sbHtml.appendLine("<head>", bCrlf);
        sbHtml.appendLine("  <link rel=\"stylesheet\" href=\"cid:CONTENT_ID_CSS\">", bCrlf);
        sbHtml.appendLine("</head>", bCrlf);
        sbHtml.appendLine("<body>", bCrlf);
        sbHtml.appendLine("", bCrlf);
        sbHtml.appendLine("<h1>This is a heading</h1>", bCrlf);
        sbHtml.appendLine("<p>This is a paragraph.</p>", bCrlf);
        sbHtml.appendLine("", bCrlf);
        sbHtml.appendLine("</body>", bCrlf);
        sbHtml.appendLine("</html>", bCrlf);

        int numReplacements = sbHtml.replace("CONTENT_ID_CSS", contentIdCss);

        email.setHtmlBody(sbHtml.getAsString());

        try {
            mailman.sendEmail(email);
            System.out.println("Mail Sent!");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
        }
    }
}