(Java) Iterate MIME Parts of an Email

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

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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[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // See the following Chilkat post to Quickly Understand Email MIME

    CkEmail email = new CkEmail();

    boolean success = email.LoadEml("qa_data/eml/sample.eml");
    if (success == false) {
        System.out.println("Failed to load .eml");
        return;
        }

    CkStringBuilder sbContentType = new CkStringBuilder();
    boolean caseSensitive = false;

    // Get the total number of non-multipart MIME sub-parts.
    // (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
    boolean inlineOnly = false;
    boolean excludeAttachments = false;
    String searchSpec = "*/*";

    int numParts = email.GetNumPartsOfType(searchSpec,inlineOnly,excludeAttachments);
    int i = 0;
    while (i < numParts) {
        // What is the Content-Type of this MIME part?
        sbContentType.Append(email.getNthContentType(i,searchSpec,inlineOnly,excludeAttachments));
        if (sbContentType.StartsWith("text/",caseSensitive) == true) {
            // Get the text body of this MIME part.
            String textBody = email.getNthTextPartOfType(i,searchSpec,inlineOnly,excludeAttachments);
            System.out.println("Got text body for " + sbContentType.getAsString());
            }
        else {
            if (sbContentType.ContentsEqual("message/rfc822",caseSensitive) == true) {
                // If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
                // Your application could load it into a Chilkat email object and recursively process...
                CkEmail attachedEmail = new CkEmail();
                CkBinData bdMime = new CkBinData();
                email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bdMime);
                attachedEmail.SetFromMimeBd(bdMime);
                // Now your app can recursively process the attachedEmail...
                }
            else {
                // Get the bytes of this MIME body part.
                CkBinData bd = new CkBinData();
                email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bd);
                System.out.println("Got binary body for " + sbContentType.getAsString() + " numBytes = " + bd.get_NumBytes());
                }

            }

        sbContentType.Clear();
        i = i+1;
        }
  }
}