Telegram Bot API Java Library

Install

Maven

<dependency>
    <groupId>ru.loolzaaa.tgbot4j</groupId>
    <artifactId>tgbot4j</artifactId>
    <version>0.3.0</version>
</dependency>

Gradle

implementation("ru.loolzaaa.tgbot4j:tgbot4j:0.3.0")

Usage

Simple LongPolling Bot

TelegramBot bot = TelegramBotBuilder.init("BOT_NAME", System.getenv("BOT_TOKEN")).build();
bot.registerUpdateProcessor(new EchoMessageUpdateProcessor());
bot.init();

Configured LongPolling Bot

TelegramBot bot = TelegramBotBuilder.init("BOT_NAME", System.getenv("BOT_TOKEN"))
        .methodSender(senderConfigurer -> {
            senderConfigurer.defaultSender(defaultSenderConfigurer -> {
                defaultSenderConfigurer.withOptions(options -> options.setMaxThreads(4));
            });
        })
        .updateReceiver(receiverConfigurer -> {
            receiverConfigurer.longPolling(longPollingConfigurer -> {
                longPollingConfigurer.withOptions(options -> {
                    options.setClearWebhookIfExist(true);
                    options.setConnectTimeout(4000);
                });
            });
        })
        .build();
bot.registerUpdateProcessor(new EchoMessageUpdateProcessor());
bot.init();

Update processing

Implement UpdateProcessor and register it to bot. Each processor can, but is not required to pass processing to the next processor in the chain.

public class ExampleProcessor implements UpdateProcessor {
    @Override
    public void process(Update update, MethodSender methodSender, UpdateProcessorChain chain) {
        try {
            // do some stuff with update, execute methods with method sender
            chain.doProcess(update, methodSender);  // <--- step into next processor in chain
        } finally {
            // optionally, do some actions AFTER ALL processors
        }
    }
}