savePhotoFile

Introduction

In this lesson, we will learn how to save photos and files to the local directory

If you didn't open the Lesson 1, don't forget to make a Bot class with a token and name of the bot, as well as connect libraries.

This lesson will present the simplest possible solution to the problem for the simplicity of the lesson. For better code, these methods would be worth rewriting

Process

The main function remains unchanged, so just copy it in previous lessons

Let's look at the HandlerToLessonFive class

We still need to Override onUpdateReceived method

For the sake of simplicity of the lesson, we will not make any commands. To save the sent document, the user will only need to send it to the chat

Before we started writing methods for saving, we will do a simple processing of the received update

public class HandleToLessonFive extends TelegramLongPollingBot {
    @Override
    public String getBotUsername() {
        return Bot.USERNAME;
    }

    @Override
    public String getBotToken() {
        return Bot.TOKEN;
    }

    @Override
    public void onUpdateReceived(Update update) {
        // Initialize sendMessage
        SendMessage sendMessage = new SendMessage();
        // If update has document
        if (update.getMessage().hasDocument()) {
            // Save file method
            saveFile(update, sendMessage);
            // If update has image
        } else if (update.hasMessage() && update.getMessage().hasPhoto()) {
            // Save photo method
            savePhoto(update, sendMessage);
        }
    }
}

If there is a document in the update, method saveFile will be called, if there is a photo, then method savePhoto

Let's start writing the methods themselves

Let's start by saving the file

public class HandleToLessonFive extends TelegramLongPollingBot {
    // Previous methods
    
    public void saveFile (Update update, SendMessage sendMessage) {
        // Set chat id to send message
        sendMessage.setChatId(String.valueOf(update.getMessage().getChatId()));
        // Set text to send message
        sendMessage.setText("file saved!");
        // Get document from update
        String getID = String.valueOf(update.getMessage().getFrom().getId());
        // Initialize document
        Document document = new Document();
        // Set mime type
        document.setMimeType(update.getMessage().getDocument().getMimeType());
        // Set file name
        document.setFileName(update.getMessage().getDocument().getFileName());
        // Set file size
        document.setFileSize(update.getMessage().getDocument().getFileSize());
        // Set file id
        document.setFileId(update.getMessage().getDocument().getFileId());
        // Initialize get file
        GetFile getFile = new GetFile();
        // Set file id
        getFile.setFileId(document.getFileId());
        try {
            // The import takes place so that you correctly import the necessary library from yourself
            org.telegram.telegrambots.meta.api.objects.File file = execute(getFile);
            // Download file
            downloadFile(file, new File("YOUR_PATH"+getID+"_"+update.getMessage().getDocument().getFileName()));
            // Send message
            execute(sendMessage);
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
}

Sending a message here is optional, it only serves to notify about a successful save

First we use class Document to create the document itself, then class GetFile to get this document

Saving a photo differs only by the type of object being created

public class HandleToLessonFive extends TelegramLongPollingBot {
    // Previous methods

    private void savePhoto(Update update, SendMessage sendMessage) {
        // Set chat id to send message
        sendMessage.setChatId(String.valueOf(update.getMessage().getChatId()));
        // Set text to send message
        sendMessage.setText("photo saved!");
        // Make list of photos
        List<PhotoSize> photos = update.getMessage().getPhoto();
        // get photo id
        String f_id = Objects.requireNonNull(photos.stream().max(Comparator.comparing(PhotoSize::getFileSize))
                .orElse(null)).getFileId();
        // Initialize get file
        GetFile getFile = new GetFile();
        // Set file id
        getFile.setFileId(f_id);
        try {
            // The import takes place so that you correctly import the necessary library from yourself
            org.telegram.telegrambots.meta.api.objects.File file = execute(getFile);
            // Download file
            downloadFile(file, new File("YOUR_PATH"+f_id));
            // Send message
            execute(sendMessage);
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
}

First we create a List of photos, then we get the largest photo from this list, then we get the file id of this photo. Then the same saving procedure is performed as in the previous method

This completes the execution of the bot to save the sent photos or documents!

You can find all the code here

Sending documents

Show Work

Document in the local directory

Show Work

Back to Lesson 4 of sending music from the local directory