你好! 如果你想了解如何在Java上编写Telegram机器人，你来对地方了!

准备启动

机器人API基于HTTP请求，但在本书中我将使用Rubenlagus的Java库

安装库

你可以使用不同的方法安装TelegramBots库, 我这里使用Maven

<dependency><groupId>org.telegram</groupId><artifactId>telegrambots</artifactId><version>Latest</version>
</dependency>

让我们开始编码吧

在本节课中，我们将编写一个简单的机器人，它会回显我们发送给它的所有内容。现在，打开inteliidea，创建一个新项目。你可以随意给它起个名字。

现在，当你在该项目中后，在src目录下创建文件MyAmazingBot.java和Main,java。打开MyAmazingBot.java，并开始编写我们的实际机器人!
记住! 类必须继承TelegramLongPollingBot并实现必要的方法。

import org.telegram.telegrambots.api.methods.send.SendMessage;
import org.telegram.telegrambots.api.objects.Update;
import org.telegram.telegrambots.bots.TelegramLongPollingBot;
import org.telegram.telegrambots.exceptions.TelegramApiException;public class MyAmazingBot extends TelegramLongPollingBot {@Overridepublic void onUpdateReceived(Update update) {// TODO}@Overridepublic String getBotUsername() {// TODOreturn null;}@Overridepublic String getBotToken() {// TODOreturn null;}
}

正如您所理解的，

`getBotUsername()'和`getBotToken ()`必须返回从 @BotFather获取的机器人的用户名和令牌。

import org.telegram.telegrambots.api.methods.send.SendMessage;
import org.telegram.telegrambots.api.objects.Update;
import org.telegram.telegrambots.bots.TelegramLongPollingBot;
import org.telegram.telegrambots.exceptions.TelegramApiException;public class MyAmazingBot extends TelegramLongPollingBot {@Overridepublic void onUpdateReceived(Update update) {// TODO}@Overridepublic String getBotUsername() {// Return bot username// If bot username is @MyAmazingBot, it must return 'MyAmazingBot'return "MyAmazingBot";}@Overridepublic String getBotToken() {// Return bot token from BotFatherreturn "12345:qwertyuiopASDGFHKMK";}
}

现在，让我们转到我们机器人的逻辑部分。

如前所述，我们希望它能够回复我们发送给它的每条文本。`onUpdateReceived(Updateupdate)`方法就是为此而设的。当接收到一条更新时，该方法会被调用。

@Override
public void onUpdateReceived(Update update) {// We check if the update has a message and the message has textif (update.hasMessage() && update.getMessage().hasText()) {// Set variablesString message_text = update.getMessage().getText();long chat_id = update.getMessage().getChatId();SendMessage message = new SendMessage() // Create a message object object.setChatId(chat_id).setText(message_text);try {execute(message); // Sending our message object to user} catch (TelegramApiException e) {e.printStackTrace();}}
}

该如何运行这个机器人呢? 保存该文件并打开Mainjava。这个文件将实例化TelegramBotsApi并注册我们的新机器人。

import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.TelegramBotsApi;
import org.telegram.telegrambots.exceptions.TelegramApiException;
public class Main {public static void main(String[] args) {// TODO Initialize Api Context// TODO Instantiate Telegram Bots API// TODO Register our bot}
}

现在，让我们初始化API上下文

import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.TelegramBotsApi;
import org.telegram.telegrambots.exceptions.TelegramApiException;
public class Main {public static void main(String[] args) {// Initialize Api ContextApiContextInitializer.init();// TODO Instantiate Telegram Bots API// TODO Register our bot}
}

实例化Telegram机器人API:

import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.TelegramBotsApi;
import org.telegram.telegrambots.exceptions.TelegramApiException;
public class Main {public static void main(String[] args) {// Initialize Api ContextApiContextInitializer.init();// Instantiate Telegram Bots APITelegramBotsApi botsApi = new TelegramBotsApi();// TODO Register our bot}
}

并注册我们的机器人:

import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.TelegramBotsApi;
import org.telegram.telegrambots.exceptions.TelegramApiException;
public class Main {public static void main(String[] args) {// Initialize Api ContextApiContextInitializer.init();// Instantiate Telegram Bots APITelegramBotsApi botsApi = new TelegramBotsApi();// Register our bottry {botsApi.registerBot(new MyAmazingBot());} catch (TelegramApiException e) {e.printStackTrace();}}
}

这是我们的所有文件:

import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.TelegramBotsApi;
import org.telegram.telegrambots.exceptions.TelegramApiException;
public class Main {public static void main(String[] args) {// Initialize Api ContextApiContextInitializer.init();// Instantiate Telegram Bots APITelegramBotsApi botsApi = new TelegramBotsApi();// Register our bottry {botsApi.registerBot(new MyAmazingBot());} catch (TelegramApiException e) {e.printStackTrace();}}
}

import org.telegram.telegrambots.api.methods.send.SendMessage;import org.telegram.telegrambots.api.objects.Update;import org.telegram.telegrambots.bots.TelegramLongPollingBot;import org.telegram.telegrambots.exceptions.TelegramApiException;public class MyAmazingBot extends TelegramLongPollingBot {@Overridepublic void onUpdateReceived(Update update) {// We check if the update has a message and the message has textif (update.hasMessage() && update.getMessage().hasText()) {// Set variablesString message_text = update.getMessage().getText();long chat_id = update.getMessage().getChatId();SendMessage message = new SendMessage() // Create a message object object.setChatId(chat_id).setText(message_text);try {execute(message); // Sending our message object to user} catch (TelegramApiException e) {e.printStackTrace();}}}@Overridepublic String getBotUsername() {// Return bot username// If bot username is @MyAmazingBot, it must return 'MyAmazingBot'return "MyAmazingBot";}@Overridepublic String getBotToken() {// Return bot token from BotFatherreturn "12345:qwertyuiopASDGFHKMK";}
}