使用 Java 中的 Gmail API 创建带有 PDF 文件作为附件的草稿

Question

我正在尝试使用 Gmail API 在 Java 中创建带有附件的草稿。

创建一个基本的草稿是有效的，所以我已经消除了任何权限问题。我在这里使用代码作为灵感，但无法让它发挥作用。

这是我到目前为止所做的：

public String generateGmailDraft(EmailRequestDto emailRequestDto, String quoteId) 

        throws MessagingException, IOException, GeneralSecurityException {

    // The attachment is a PDF file

    AttachmentDto lastQuoteData = getLastQuotePdfData(quoteId);

    MimeMessage email = createMimeMessage(emailRequestDto, lastQuoteData);

    Message messageWithEmail = createMessageWithEmail(email);

    Draft draft = new Draft();

    draft.setMessage(messageWithEmail);

    // this works

    Gmail gmail = gmail(googleGmailCredentialProperties);

    log.debug("attempting to send mail");

    draft = gmail.users().drafts().create(emailRequestDto.getFrom(), draft).execute();

    log.debug("Draft id: {}", draft.getMessage().getId());

    log.debug(draft.toPrettyString());

    return draft.getMessage().getId();

}

从 Google 示例中，我创建了一个 MIME 消息，但这可能是问题所在：

/**

 * Create a MimeMessage using the parameters provided

 * @return the MimeMessage to be used to send email

 * @throws MessagingException

 */

private MimeMessage createMimeMessage(EmailRequestDto requestDto, AttachmentDto attachment)

        throws MessagingException, IOException {

    Properties props = new Properties();

    Session session = Session.getDefaultInstance(props, null);

    MimeMessage email = new MimeMessage(session);

    email.setFrom(new InternetAddress(requestDto.getFrom()));

    email.addRecipient(javax.mail.Message.RecipientType.TO, ew InternetAddress(requestDto.getTo()));

    email.setSubject(requestDto.getSubject());

    BodyPart messageBodyPart = new MimeBodyPart();

    messageBodyPart.setHeader("Content-Type", "multipart/alternative");

}

Answer 1

尝试与此类似的操作：private MimeMessage createEmailWithAttachment(String to,        String subject,        String bodyText,        File file) throws MessagingException, IOException {    Properties props = new Properties();    Session session = Session.getDefaultInstance(props, null);    MimeMessage email = new MimeMessage(session);    email.addRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress(to));    email.setSubject(subject);    MimeBodyPart mimeBodyPart = new MimeBodyPart();    mimeBodyPart.setContent(bodyText, "text/plain");    Multipart multipart = new MimeMultipart();    multipart.addBodyPart(mimeBodyPart);    mimeBodyPart = new MimeBodyPart();    DataSource source = new FileDataSource(file);    mimeBodyPart.setDataHandler(new DataHandler(source));    mimeBodyPart.setFileName(file.getName());    multipart.addBodyPart(mimeBodyPart);    email.setContent(multipart);    return email;}