Java

Extract Linked Domains from an HTML Email

Demonstrates the Chilkat Email.LinkedDomains method, which extracts the domain names from the hyperlinks in an HTML email. Lowercase domains are appended to a StringTable without creating duplicates. This example sets an HTML body with several links and lists the distinct domains.

Background: The set of domains a message links to is a strong signal for spam and phishing analysis — legitimate mail usually points at a few expected domains, while abusive mail often hides links to many unrelated or look-alike hosts. LinkedDomains gives you that de-duplicated list directly. Note it only parses the links; it does not fetch them, so no network request is made.

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Java

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[])
  {
    boolean success = false;

    //  Demonstrates the LinkedDomains method, which extracts the domain names from the
    //  hyperlinks in an HTML email.  Lowercase domains are appended to a StringTable without
    //  creating duplicates.

    CkEmail email = new CkEmail();
    email.put_Subject("LinkedDomains example");

    //  An HTML body containing several hyperlinks.
    email.SetHtmlBody("<html><body>Visit <a href=\"https://www.example.com/page\">Example</a>, <a href=\"http://sales.contoso.com\">Contoso</a>, and <a href=\"https://www.example.com/other\">Example again</a>.</body></html>");

    //  Extract the linked domains into a StringTable.
    CkStringTable domains = new CkStringTable();

    success = email.LinkedDomains(domains);
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    int n = domains.get_Count();
    int i;
    for (i = 0; i <= n - 1; i++) {
        System.out.println(domains.stringAt(i));
        }
  }
}