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. Chilkat2 Java

import com.chilkatsoft.chilkat2.Mime;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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.

        Mime mime = new Mime();

        // 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.setContentType("text/plain");
        mime.setCharset("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.getContentType());
        System.out.println("Charset property: " + mime.getCharset());
        System.out.println("Name property: " + mime.getName());
        System.out.println("-");

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