How to send message from java or telegram scheduler?

[MainStar]

Hi, could you help please, how to create a scheduler which will send message to all chats (users) with java?

[AndriiRomanenko]

Hi! To create a scheduler you could create your application, basis on Spring Framework

TelegramBot has spring starter dependency

<dependency>
            <groupId>org.telegram</groupId>
            <artifactId>telegrambots-spring-boot-starter</artifactId>
            <version>4.9.1</version>
        </dependency>

Using Spring Framework you can create a scheduler, using this part of the code:

@Configuration
@EnableScheduling
public class Scheduler {

   @Scheduled(fixedDelay = 5000L)
  public void foo() {
   // your scheduler job code here
  }
}

Method foo() will do some job with delay of 5 seconds. You could configure on cron expression

Next what you need is a list of user's chat id. You could hold it in a file or in a database.

Class TelegramLongPollingBot has method execute, that take SendMessage object for sending messages to the users. All you need are the chat id of the user and text message, that you want to send. It can looks like this

public void sendMessage(Long chatId, String textMessage) {
        SendMessage message = new SendMessage()
                .setChatId(chatId)
                .setText(textMessage);
        try {
            execute(message);
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }

[MainStar]

Hi! Thanks a lot, It works! 👍