javax.activation
接口 
CommandObject
DataContentHandler
DataContentHandlerFactory
DataSource
 
ActivationDataFlavor
CommandInfo
CommandMap
DataHandler
FileDataSource
FileTypeMap
MailcapCommandMap
MimeType
MimeTypeParameterList
MimetypesFileTypeMap
URLDataSource
异常 
MimeTypeParseException
UnsupportedDataTypeException