Retrieve email/message body in html using Gmail API

Question

Is there any way to retrieve message body in html form using GMail api ?

I have already gone through the message.get docs. Tried changing the format par

Answer 1

Here is the full tutorial:

1- Assuming you already went through all credentials creation here

2- This is how you retrieve a Mime Message:

 public static String getMimeMessage(String messageId)
            throws Exception {

           //getService definition in -3
        Message message = getService().users().messages().get("me", messageId).setFormat("raw").execute();

        Base64 base64Url = new Base64(true);
        byte[] emailBytes = base64Url.decodeBase64(message.getRaw());

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

        MimeMessage email = new MimeMessage(session, new ByteArrayInputStream(emailBytes));

        return getText(email); //getText definition in at -4
    }

3- This is the piece that creates the Gmail instance:

private static Gmail getService() throws Exception {
    final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
    // Load client secrets.
    InputStream in = SCFManager.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
    if (in == null) {
        throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
    }
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

    // Build flow and trigger user authorization request.
    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
            HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
            .setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
            .setAccessType("offline")
            .build();
    LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8888).build();
    Credential credential = new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");

    return new Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
            .setApplicationName(APPLICATION_NAME)
            .build();
}

4- And this is how you parse Mime Messages:

 public static String getText(Part p) throws
            MessagingException, IOException {
        if (p.isMimeType("text/*")) {
            String s = (String) p.getContent(); 
            return s;
        }

        if (p.isMimeType("multipart/alternative")) {
            // prefer html text over plain text
            Multipart mp = (Multipart) p.getContent();
            String text = null;
            for (int i = 0; i < mp.getCount(); i++) {
                Part bp = mp.getBodyPart(i);
                if (bp.isMimeType("text/plain")) {
                    if (text == null) {
                        text = getText(bp);
                    }
                    continue;
                } else if (bp.isMimeType("text/html")) {
                    String s = getText(bp);
                    if (s != null) {
                        return s;
                    }
                } else {
                    return getText(bp);
                }
            }
            return text;
        } else if (p.isMimeType("multipart/*")) {
            Multipart mp = (Multipart) p.getContent();
            for (int i = 0; i < mp.getCount(); i++) {
                String s = getText(mp.getBodyPart(i));
                if (s != null) {
                    return s;
                }
            }
        }

        return null;
    }

5- If you were wondering how to get the email id, this is how you list them:

 public static List listTodayMessageIds() throws Exception {
        ListMessagesResponse response = getService()
                .users()
                .messages()
                .list("me") 
                .execute();  

        if (response != null && response.getMessages() != null && !response.getMessages().isEmpty()) {
            return response.getMessages().stream().map(Message::getId).collect(Collectors.toList());
        } else {
            return null;
        }
    }

Note:

If after this you want to query that html body in the "kind of Java Script way", I recommend you to explore jsoup library.. very intuitive and easy to work with:

Document jsoup = Jsoup.parse(body);

Elements tds = jsoup.getElementsByTag("td");
Elements ps = tds.get(0).getElementsByTag("p");

I hope this helps :-)