224 lines
9.7 KiB
Markdown
224 lines
9.7 KiB
Markdown
* [How to get picture?](#how_to_get_picture)
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* [How to send photos?](#how_to_send_photos)
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* [How do I send photos by file_id?](#how_to_send_photos_file_id)
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* [How to use custom keyboards?](#how_to_use_custom_keyboards)
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* [How can I run my bot?](#how_to_host)
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* [How can I compile my project?](#how_to_compile)
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* [Method ```sendMessage()``` (or other) is deprecated, what should I do?](#sendmessage_deprecated)
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* [Is there any example for WebHook?](#example_webhook)
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## <a id="how_to_get_picture"></a>How to download photo? ##
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To download a picture (or any other file), you will need the `file_path` of the file. Let start by finding the photo we want to download, the following method will extract the `PhotoSize` from a photo sent to the bot (in our case, we are taken the bigger size of those provided):
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```java
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public PhotoSize getPhoto(Update update) {
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// Check that the update contains a message and the message has a photo
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if (update.hasMessage() && update.getMessage().hasPhoto()) {
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// When receiving a photo, you usually get different sizes of it
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List<PhotoSize> photos = update.getMessage().getPhoto();
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// We fetch the bigger photo
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return photos.stream()
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.sorted(Comparator.comparing(PhotoSize::getFileSize).reversed())
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.findFirst()
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.orElse(null);
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}
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// Return null if not found
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return null;
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}
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```
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Once we have the *photo* we have to options: The `file_path` is already present or we need to get it, the following method will handle both of them and return the final `file_path`:
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```java
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public String getFilePath(PhotoSize photo) {
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Objects.requireNonNull(photo);
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if (photo.hasFilePath()) { // If the file_path is already present, we are done!
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return photo.getFilePath();
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} else { // If not, let find it
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// We create a GetFile method and set the file_id from the photo
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GetFile getFileMethod = new GetFile();
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getFileMethod.setFileId(photo.getFileId());
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try {
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// We execute the method using AbsSender::execute method.
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File file = execute(getFileMethod);
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// We now have the file_path
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return file.getFilePath();
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} catch (TelegramApiException e) {
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e.printStackTrace();
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}
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}
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return null; // Just in case
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}
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```
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Now that we have the `file_path` we can download it:
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```java
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public java.io.File downloadPhotoByFilePath(String filePath) {
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try {
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// Download the file calling AbsSender::downloadFile method
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return downloadFile(filePath);
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} catch (TelegramApiException e) {
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e.printStackTrace();
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}
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return null;
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}
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```
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The returned `java.io.File` object will be your photo
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## <a id="how_to_send_photos"></a>How to send photos? ##
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There are several method to send a photo to an user using `sendPhoto` method: With a `file_id`, with an `url` or uploading the file. In this example, we assume that we already have the *chat_id* where we want to send the photo:
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```java
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public void sendImageFromUrl(String url, String chatId) {
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// Create send method
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SendPhoto sendPhotoRequest = new SendPhoto();
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// Set destination chat id
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sendPhotoRequest.setChatId(chatId);
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// Set the photo url as a simple photo
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sendPhotoRequest.setPhoto(url);
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try {
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// Execute the method
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sendPhoto(sendPhotoRequest);
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} catch (TelegramApiException e) {
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e.printStackTrace();
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}
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}
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public void sendImageFromFileId(String fileId, String chatId) {
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// Create send method
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SendPhoto sendPhotoRequest = new SendPhoto();
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// Set destination chat id
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sendPhotoRequest.setChatId(chatId);
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// Set the photo url as a simple photo
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sendPhotoRequest.setPhoto(fileId);
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try {
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// Execute the method
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sendPhoto(sendPhotoRequest);
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} catch (TelegramApiException e) {
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e.printStackTrace();
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}
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}
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public void sendImageUploadingAFile(String filePath, String chatId) {
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// Create send method
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SendPhoto sendPhotoRequest = new SendPhoto();
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// Set destination chat id
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sendPhotoRequest.setChatId(chatId);
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// Set the photo file as a new photo (You can also use InputStream with a method overload)
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sendPhotoRequest.setNewPhoto(new File(filePath));
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try {
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// Execute the method
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sendPhoto(sendPhotoRequest);
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} catch (TelegramApiException e) {
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e.printStackTrace();
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}
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}
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```
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## <a id="how_to_send_photos_file_id"></a>How to send photo by its file_id? ##
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In this example we will check if user sends to bot a photo, if it is, get Photo's file_id and send this photo by file_id to user.
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```java
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// If it is a photo
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if (update.hasMessage() && update.getMessage().hasPhoto()) {
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// Array with photos
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List<PhotoSize> photos = update.getMessage().getPhoto();
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// Get largest photo's file_id
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String f_id = photos.stream()
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.sorted(Comparator.comparing(PhotoSize::getFileSize).reversed())
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.findFirst()
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.orElse(null).getFileId();
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// Send photo by file_id we got before
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SendPhoto msg = new SendPhoto()
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.setChatId(update.getMessage().getChatId())
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.setPhoto(f_id)
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.setCaption("Photo");
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try {
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sendPhoto(msg); // Call method to send the photo
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} catch (TelegramApiException e) {
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e.printStackTrace();
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}
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}
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```
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## <a id="how_to_use_custom_keyboards"></a>How to use custom keyboards? ##
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Custom keyboards can be appended to messages using the `setReplyMarkup`. In this example, we will build a simple [ReplyKeyboardMarkup](https://core.telegram.org/bots/api#replykeyboardmarkup) with two rows and three buttons per row, but you can also use other types like [ReplyKeyboardHide](https://core.telegram.org/bots/api#replykeyboardhide), [ForceReply](https://core.telegram.org/bots/api#forcereply) or [InlineKeyboardMarkup](https://core.telegram.org/bots/api#inlinekeyboardmarkup):
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```java
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public void sendCustomKeyboard(String chatId) {
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SendMessage message = new SendMessage();
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message.setChatId(chatId);
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message.setText("Custom message text");
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// Create ReplyKeyboardMarkup object
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ReplyKeyboardMarkup keyboardMarkup = new ReplyKeyboardMarkup();
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// Create the keyboard (list of keyboard rows)
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List<KeyboardRow> keyboard = new ArrayList<>();
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// Create a keyboard row
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KeyboardRow row = new KeyboardRow();
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// Set each button, you can also use KeyboardButton objects if you need something else than text
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row.add("Row 1 Button 1");
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row.add("Row 1 Button 2");
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row.add("Row 1 Button 3");
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// Add the first row to the keyboard
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keyboard.add(row);
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// Create another keyboard row
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row = new KeyboardRow();
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// Set each button for the second line
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row.add("Row 2 Button 1");
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row.add("Row 2 Button 2");
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row.add("Row 2 Button 3");
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// Add the second row to the keyboard
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keyboard.add(row);
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// Set the keyboard to the markup
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keyboardMarkup.setKeyboard(keyboard);
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// Add it to the message
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message.setReplyMarkup(keyboardMarkup);
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try {
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// Send the message
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execute(message);
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} catch (TelegramApiException e) {
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e.printStackTrace();
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}
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}
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```
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## <a id="how_to_host"></a>How can I run my bot? ##
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You don't need to spend a lot of money into hosting your own telegram bot. Basically, there are two options around how to host:
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1. Hosting on your own hardware. It can be a Mini-PC like a Raspberry Pi. The costs for the hardware (~35€) and annual costs for power (~7-8€) are low. Keep in mind that your internet connection might be limited and a Mini-Pc is not ideal for a large users base.
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2. Run your bot in a Virtual Server/dedicated root server. There are many hosters out there that are providing cheap servers that fit your needs. The cheapest one should be openVZ-Containers or a KVM vServer. Example providers are [Hetzner](https://www.hetzner.de/ot/), [DigitalOcean](https://www.digitalocean.com/), (are providing systems that have a high availability but cost's a bit more) and [OVH](https://ovh.com)
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For a deeper explanation for deploying your bot on DigitalOcean please see the [Lesson 5. Deploy your bot](https://monsterdeveloper.gitbooks.io/writing-telegram-bots-on-java/content/lesson-5.-deploy-your-bot.html) chapter in [MonsterDeveloper](https://github.com/MonsterDeveloper)'s book
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## <a id="how_to_compile"></a>How can I compile my project? ##
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This is just one way, how you can compile it (here with maven). The example below below is compiling the TelegramBotsExample repo.
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[](https://asciinema.org/a/4np9i2u9onuitkg287ism23kj)
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## <a id="sendmessage_deprecated"></a>Method ```sendMessage()``` (or other) is deprecated, what should I do? ##
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Please use ```execute()``` instead.
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Example:
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```java
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SendMessage sn = new SendMessage();
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//add chat id and text
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execute(sn);
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```
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If you extend ```TelegramLongPollingCommandBot```, then use ```AbsSender.execute()``` instead.
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## <a id="example_webhook"></a>Is there any example for WebHook? ##
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Please see the example Bot for https://telegram.me/SnowcrashBot in the [TelegramBotsExample]() repo and also an [example bot for Sping Boot](https://github.com/UnAfraid/SpringTelegramBot) from [UnAfraid](https://github.com/UnAfraid) [here](https://github.com/UnAfraid/SpringTelegramBot/blob/master/src/main/java/com/github/unafraid/spring/bot/TelegramWebhookBot.java)
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