[LINE BOT] I made a ramen BOT with Java (Maven) + Heroku + Spring Boot (1)

Create a reply function by connecting Heroku and LINE API!

I want to make a ramen bot using the LINE API! so First of all, use Java LINE Bot SDK to create an "echo" bot that returns parrots. ▼ Implemented with reference to the following URL "Create a sample bot on Heroku" https://developers.line.me/ja/docs/messaging-api/building-sample-bot-with-heroku/

Tools used

・ LINE Messaging API -Java LINE Bot SDK ・ Heroku ・ Java

procedure

1. Set up the LINE Messaging API
2. Set up Heroku
3. Generate Maven Project
4. Deploy to Heroku

• This time, the settings of LINE Messaging API and Heroku are omitted.

Create Maven project

1.pom.xml

pom.xml

.
.
.

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.9.RELEASE</version>
	</parent>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>
    
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
		</dependency>
		<dependency>
			<groupId>com.linecorp.bot</groupId>
			<artifactId>line-bot-api-client</artifactId>
			<version>1.12.0</version>
			<scope>compile</scope>
			<exclusions>
				<exclusion>
					<artifactId>commons-logging</artifactId>
					<groupId>commons-logging</groupId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>com.linecorp.bot</groupId>
			<artifactId>line-bot-model</artifactId>
			<version>1.12.0</version>
			<scope>compile</scope>
			<exclusions>
				<exclusion>
					<artifactId>commons-logging</artifactId>
					<groupId>commons-logging</groupId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>com.linecorp.bot</groupId>
			<artifactId>line-bot-spring-boot</artifactId>
			<version>1.11.0</version>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

2.application.yml Acccess Token and Channel Secret are generated when you create a new channel with the LINE Messaging API

application.yml

line.bot:
  channel-token: 'AcccessToken'
  channel-secret: 'Channel Secret'
  handler.path: /callback

3.Procfile ★ ☆ Point ☆ ★

1. Generate a file under the root directory
2. The file name is "Procfile" * The first "P" is capitalized! https://devcenter.heroku.com/articles/procfile

Procfile

web: java $JAVA_OPTS -jar target/{APPNAME}-0.0.1-SNAPSHOT.jar --server.port=$PORT

4.App.java I copied the code in the Java LINE Bot SDK.

App.java

@SpringBootApplication
@LineMessageHandler
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
		System.out.println("hello");
	}

	@EventMapping
	public TextMessage handleTextMessageEvent(MessageEvent<TextMessageContent> event) {
		System.out.println("event: " + event);
		return new TextMessage(event.getMessage().getText());
	}

	@EventMapping
	public void handleDefaultMessageEvent(Event event) {
		System.out.println("event: " + event);
	}
}

Deploy to Heroku!

//Local repository generation, commit
$ git init
$ git add -A  
$ git commit

//Login to heroku from CLI tool
$ heroku login

//Web application generation in Heroku (remote repository is also generated at this time)
$ heroku create APPNAME 

//Link local repository and remote repository
$ heroku git:remote --app APPNAME 

git push heroku master

Webhook settings

・ Send Webhook ⇒ Use ・ Webhook URL ⇒ https: // {APPNAME} .herokuapp.com / callback {APPNAME} is the name of the application you created

** OK if the connection is confirmed successfully! !! ** **

You have now implemented the reply function! !!

I thought it was easy, but I struggled because the LINE Message API and heroku didn't connect. Please refer to it ☆ Next time, we will implement Ramen BOT.