Java

Unzip an Email's Zip Attachments

Demonstrates the Chilkat Email.UnzipAttachments method, which unzips and replaces any Zip file attachments with their expanded contents. For example, if an email contains a single Zip holding three files, that Zip attachment is replaced by the three files as individual attachments. This example loads an email and expands its Zip attachments.

Background: Senders often bundle several files into one .zip to keep a message tidy or to compress large content. UnzipAttachments reverses that automatically, so downstream processing can work with the individual files directly rather than having to detect, extract, and re-inject archive contents. It is the inverse of ZipAttachments.

Chilkat Java Downloads

Download Chilkat for Java

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 UnzipAttachments method, which unzips and replaces any Zip file
    //  attachments with their expanded contents.  For example, a single Zip containing 3 files
    //  is replaced by those 3 files as individual attachments.

    CkEmail email = new CkEmail();

    success = email.LoadEml("qa_data/eml/with_zip_attachment.eml");
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

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

    //  Expand any Zip attachments in place.
    success = email.UnzipAttachments();
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

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

    //  Note: The path "qa_data/..." is a relative local filesystem path,
    //  relative to the current working directory of the running application.
  }
}