produces()

public class MediaType {

    public static final String HTML = "text/html";
    public static final String ANY = "*/*";
    public static final String JSON = "application/json";

    private final String mediaType;
    private final Class<? extends Responder> responderClass;

    private MediaType(final String mediaType, Class<? extends Responder> responderClass) {
        this.mediaType = mediaType;
        this.responderClass = responderClass;
    }

    public String getMediaType() {
        return mediaType;
    }

    public Class<? extends Responder> getResponderClass() {
        return responderClass;
    }

    @Override
    public String toString() {
        return "MediaType[type=" + mediaType + ", responderClass=" + responderClass + "]";
    }

    public static MediaType html() {
        return new MediaType(HTML, HtmlViewResponder.class);
    }

    public static MediaType jsp() {
        return new MediaType(HTML, JspViewResponder.class);
    }

    public static MediaType json() {
        return new MediaType(JSON, JsonResponder.class);
    }

}