Send push notification from springboot

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I have a springboot application which I’m hosting on my own home server. I have sql database setup on the same.

And for front end I’m planning to use android for initial testing phase then shift it to flutter.

I was wonder how do I send notifications from my spring boot to my front end application. I have seen a few articles on how to send it through fire base but I was wondering if there’s another way of achieving the same without using an external service.

I have setup my server running Ubuntu on on 3 pc which loadbalances my app and want to use one of them to send push notifications.

spring-boot flutter android-studio push-notification notifications
1 Answers

Please follow the below steps

  1. Install Dependency (Gradle/ Maven)

Gradle

implementation 'com.google.firebase:firebase-admin:8.1.0'

Maven

  <dependency>
       <groupId>com.google.firebase</groupId>
       <artifactId>firebase-admin</artifactId>
       <version>8.1.0</version>
  </dependency>
  1. Add firebase-service-account.json file

../src/main/resources/firebase-service-account.json

  1. Open MainApplication java class
import com.google.auth.oauth2.GoogleCredentials;
import com.google.firebase.FirebaseApp;
import com.google.firebase.FirebaseOptions;
import com.google.firebase.messaging.FirebaseMessaging;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.ClassPathResource;

import java.io.IOException;

@SpringBootApplication
public class BackendApplication {
    public static void main(String[] args) {
        SpringApplication.run(BackendApplication.class, args);
    }

    @Bean
    FirebaseMessaging firebaseMessaging() throws IOException {
        GoogleCredentials googleCredentials = GoogleCredentials
                .fromStream(new ClassPathResource("firebase-service-account.json").getInputStream());
        FirebaseOptions firebaseOptions = FirebaseOptions
                .builder()
                .setCredentials(googleCredentials)
                .build();
        FirebaseApp app = FirebaseApp.initializeApp(firebaseOptions, "YOUR APP NAME");
        return FirebaseMessaging.getInstance(app);
    }
}
  1. Create Service

import com.google.firebase.messaging.FirebaseMessaging;
import com.google.firebase.messaging.FirebaseMessagingException;
import com.google.firebase.messaging.Message;
import com.google.firebase.messaging.Notification;
import org.springframework.stereotype.Service;

@Service
public class FirebaseMessagingService {

    private final FirebaseMessaging firebaseMessaging;

    public FirebaseMessagingService(FirebaseMessaging firebaseMessaging) {
        this.firebaseMessaging = firebaseMessaging;
    }


    public void sendNotification(String title, String body, String token) throws FirebaseMessagingException {

        Notification notification = Notification
                .builder()
                .setTitle(title)
                .setBody(body)
                .build();

        Message message = Message
                .builder()
                .setToken(token)
                .setNotification(notification)
//              .putAllData(note.getData())
                .build();
        firebaseMessaging.send(message);
    }
}
  1. Usage of service inside controller
    @Autowired
    private FirebaseMessagingService firebaseService;

    
    public void sendPushMessage(){
        firebaseService.sendNotification("Notification title", "Notification Text", "Receiver device token");
    }
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