javaMail中的FetchProfile起什么作用?

wbel 2003-09-14 12:58:54
就像下面这段程序:
Message[] msgs = folder.getMessages();

FetchProfile fp = new FetchProfile();
fp.add(FetchProfile.Item.ENVELOPE);
fp.add("X-mailer");
folder.fetch(msgs, fp);
希望有人帮我解释一下
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javaMail的详细文档,都有以下多有类的详细信息: ACL Address AddressException AddressStringTerm AddressTerm AndTerm AuthenticationFailedException Authenticator BodyPart BodyTerm ByteArrayDataSource ComparisonTerm ConnectionAdapter ConnectionEvent ConnectionListener ContentDisposition ContentType DateTerm DeliveryStatus DispositionNotification FetchProfile FetchProfile.Item Flags Flags.Flag FlagTerm Folder FolderAdapter FolderClosedException FolderEvent FolderListener FolderNotFoundException FromStringTerm FromTerm Header HeaderTerm HeaderTokenizer HeaderTokenizer.Token IllegalWriteException IMAPFolder IMAPFolder.FetchProfileItem IMAPFolder.ProtocolCommand IMAPMessage IMAPSSLStore IMAPStore IntegerComparisonTerm InternetAddress InternetHeaders InternetHeaders.InternetHeader MailDateFormat MailEvent MailHandler MailSSLSocketFactory Message Message.RecipientType MessageAware MessageChangedEvent MessageChangedListener MessageContext MessageCountAdapter MessageCountEvent MessageCountListener MessageHeaders MessageIDTerm MessageNumberTerm MessageRemovedException MessagingException MethodNotSupportedException MimeBodyPart MimeMessage MimeMessage.RecipientType MimeMultipart MimePart MimePartDataSource MimeUtility Multipart MultipartDataSource MultipartReport NewsAddress NoSuchProviderException NotTerm OrTerm ParameterList ParseException Part PasswordAuthentication POP3Folder POP3Message POP3SSLStore POP3Store PreencodedMimeBodyPart Provider Provider.Type Quota Quota.Resource QuotaAwareStore ReadOnlyFolderException ReceivedDateTerm RecipientStringTerm RecipientTerm Report Rights Rights.Right SearchException SearchTerm SendFailedException SentDateTerm Service Session SharedByteArrayInputStream SharedFileInputStream SharedInputStream SizeTerm SMTPAddressFailedException SMTPAddressSucceededException SMTPMessage SMTPSendFailedException SMTPSSLTransport SMTPTransport Store StoreClosedException StoreEvent StoreListener StringTerm SubjectTerm Transport TransportAdapter TransportEvent TransportListener UIDFolder UIDFolder.FetchProfileItem URLName

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