Java Enterprise in a Nutshell, Second Edition

Name

Part

Synopsis

The Part interface provides the core functionality for JavaMail messages. It is used by both Message objects and BodyPart objects to manipulate message attributes and content. When implemented by a Message object, Part provides overall information about the entire message, including content type and message headers. In this case, the content of the Part can be of one type (such as text) or a Multipart object containing a set of BodyPart objects. Each BodyPart also implements Part, and contains a component of a multipart message (body text, HTML text, file attachments and so on). The attributes of each BodyPart object define the nature and disposition of that particular part. Part models a MIME Entity (see RFC-2045 for more information).

The Part interface provides set and get methods for commonly used message attributes: content, filename, size, and disposition. Arbitrary message headers can be set using the setHeader() and addHeader() methods, or by using the additional set and get methods provided by the various Part subclasses.

The content of a Part can be set in a variety of ways. The simplest is to call setText(), which allows String content with a MIME type of “text/plain.” Content can also be set via the various setContent() methods, which accept Java objects and MIME types, as well as DataHandler objects from the JavaMail Activation Framework.

public interface Part {
// Public Constants
   public static final String ATTACHMENT;                        // ="attachment” public static ...