Java

Zip an Email's Attachments into One File

Demonstrates the Chilkat Email.ZipAttachments method, which replaces all of an email's attachments with a single Zip file attachment having the specified filename. The original attachments are removed and packed into the Zip. This example adds two attachments and zips them into one.

Background: Bundling multiple attachments into a single .zip keeps a message tidy, compresses the payload, and works around recipients or gateways that limit the number of attachments. Note that the filename here (files.zip) names the attachment inside the message — it is not a path on disk. The reverse operation is UnzipAttachments.

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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 ZipAttachments method, which replaces all of an email's attachments
    //  with a single Zip file attachment having the specified filename.  The original
    //  attachments are removed and packed into the Zip.

    CkEmail email = new CkEmail();
    email.put_Subject("Zip the attachments");

    email.AddStringAttachment("a.txt","first attachment");
    email.AddStringAttachment("b.txt","second attachment");
    System.out.println("NumAttachments before = " + email.get_NumAttachments());

    //  Replace all attachments with a single Zip attachment named "files.zip".
    success = email.ZipAttachments("files.zip");
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    System.out.println("NumAttachments after = " + email.get_NumAttachments());
  }
}