| ActivationDataFlavor | Activation-specific DataFlavor with improved MIME parsing. |
| CommandInfo | Description of the result of a command request. |
| CommandMap | Registry of command objects available to the system. |
| CommandObject | Bean interface to implement in order to receive notification of the command verb. |
| DataContentHandler | Provider that can convert streams to objects and vice versa. |
| DataContentHandlerFactory | Factory interface for creating data content handlers. |
| DataHandler | Handler for data available in multiple sources and formats. |
| DataSource | An interface by which MIME data can be retrieved and stored. |
| FileDataSource | Data source encapsulating a file. |
| FileTypeMap | Classifier for the MIME content type of files. |
| MailcapCommandMap | Implementation of a command map using a mailcap file (RFC 1524). |
| MimeType | A MIME content type, as defined in RFCs 2045 and 2046. |
| MimeTypeParameterList | A list of MIME type parameters, as specified in RFCs 2045 and 2046. |
| MimeTypeParseException | Exception thrown to indicate a malformed MIME content type. |
| MimetypesFileTypeMap | Implementation of FileTypeMap that uses the mime.types format. |
| URLDataSource | DataSource implementation that retrieves its data from a URL. |
| UnsupportedDataTypeException | Exception indicating that the requested method doesn't support the specified data type. |