Java

The MIME Content-Type Header Field

See more MIME Examples

Explains the ContentType property and the Content-Type header field including the various attributes that may be included. 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;

    //  Every part in a MIME messsage should include a Content-Type header field.
    //  The Content-Type indicates the type of content contained in the MIME part.
    //  For example: text/plain, image/jpeg, application/pdf, application/json, multipart/mixed, etc.

    //  Multipart content types are those where the MIME part's body is composed of N inner MIME messages,
    //  separated by a boundary string.
    //  This is how MIME gets a nested, tree-like structure.  The most common multipart MIME types
    //  are (for email related MIME) multipart/mixed, multipart/alternative, and multipart/related,
    //  and for HTTP related MIME, it is multipart/form-data.

    CkMime mime = new CkMime();

    //  The Content-Type header field can be set or modified in two ways.
    //  1) By setting the ContentType, Micalg, Name, Charset, Boundary, or Protocol properties.
    //     Setting the ContentType property sets the primary value (such as "text/plain") of the header field.
    //     Each of the other properties listed above will replace or add a particular attribute value.

    //  2) By setting the entire contents of the ContentType header with the SetHeaderField method.
    //     This updates each of the Content-Type related properties.

    //  For example:
    mime.put_ContentType("text/plain");
    mime.put_Charset("utf-8");

    //  The Content-Type header field contains this:
    //      Content-Type: text/plain; charset=utf-8
    System.out.println(mime.getEntireHead());
    System.out.println("-");

    mime.SetHeaderField("Content-Type","image/jpeg; name=\"kitty.jpg\"");
    //  The Content-Type header field now contains this:
    //      Content-Type: image/jpeg; name="kitty.jpg"
    System.out.println(mime.getEntireHead());
    System.out.println("-");

    //  Notice how the properties have been updated:
    System.out.println("ContentType property: " + mime.contentType());
    System.out.println("Charset property: " + mime.charset());
    System.out.println("Name property: " + mime.name());
    System.out.println("-");

    //  To change a particular attribute value, set the property.
    mime.put_Name("doggy.jpg");
    System.out.println(mime.getEntireHead());
    System.out.println("-");

    //  To remove an attribute value from the Content-Type header,
    //  set the property to an empty string.
    mime.put_Name("");
    System.out.println(mime.getEntireHead());
    System.out.println("-");
  }
}