Java 当类型为text/html时读取电子邮件内容；字符集=iso-8859-1

我正在读一封来自这样一个特定文件夹的未读邮件。消息内容类型为text/html；字符集=iso-8859-1。如何将内容获取为字符串？当我做一个toString时，我得到了类似com.sun.mail.util的东西。QPDecoderStream@4461c7e3

  public Message[] fetchMessages(String host, String user, String password,String folder, boolean read) throws IOException {
            try {
                Properties properties = new Properties();
                properties.put("mail.store.protocol", "imaps");

                Session emailSession = Session.getDefaultInstance(properties);
                Store store = emailSession.getStore();
                store.connect(host, user, password);

                Folder folderToRead = store.getFolder(folder);
                folderToRead.open(Folder.READ_WRITE);
                Flags seen = new Flags(Flags.Flag.SEEN);
                FlagTerm unseenFlagTerm = new FlagTerm(seen, read);
                Message messages[] = folderToRead.search(unseenFlagTerm);
                System.out.println(messages.length);
                for(Message message : messages){
                    System.out.println(getMessageContent(message));
                }
    }
public getMessageContent(Message message){
        String result = "";
        if (message.isMimeType("text/html")) {
           // My message type is coming as text/html
            result = message.getContent().toString();
        }
        else if (message.isMimeType("text/plain")) {
            result = message.getContent().toString();
        } 
        return result;

}

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text/plain是未知类型，以inputstream的形式出现。这对我有用

private static String getTextFromMessage(Message message) throws IOException, MessagingException {
        String result = "";
       if (message.isMimeType("text/plain")) {
            result = message.getContent().toString();
        } else if (message.isMimeType("multipart/*")) {
            MimeMultipart mimeMultipart = (MimeMultipart) message.getContent();
            result = getTextFromMimeMultipart(mimeMultipart);
        }
        else{
             StringWriter writer = new StringWriter();
             IOUtils.copy(message.getInputStream(), writer, "UTF-8");
             result = writer.toString();
        }
        return result;
    }

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消息

来自哪里？你看过它的文档了吗？它在我的outlook中是一条纯文本消息。