Spring Boot SMS Alerts via AWS SNS Topic | Send SMS Using AWS SNS Topic in Spring Boot App

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Mastering SMS with AWS SNS Topics & Spring Boot

Sending notifications is a vital part of any application. In this guide, we’ll explore how to use Amazon Simple Notification Service (SNS) Topics to broadcast SMS messages to multiple subscribers simultaneously using Spring Boot.

What is an SNS Topic?

Think of an SNS Topic like a Radio Station. Your Spring Boot application acts as the DJ (Publisher), and your users' phone numbers are the radios (Subscribers) tuned into that specific station. When you broadcast a message, everyone tuned in receives it instantly!

• 📢 Publisher: Sends the message to the Topic.
• 📡 Topic: An access point that groups your subscribers.
• 📱 Subscriber: The end recipient (SMS, Email, Lambda, etc.).

Core Implementation Steps

1. AWS Configuration: Set up your AWSCredentials and AmazonSNSClient in Spring Boot.
2. Create the Topic: Define your Topic in the AWS Console and grab the Topic ARN.
3. Manage Subscriptions: Add phone numbers to the Topic so they can receive your broadcasts.
4. Publishing: Use the PublishRequest object to send your message to the Topic ARN.

Essential Properties

aws.accessKey=YOUR_ACCESS_KEY
aws.secretKey=YOUR_SECRET_KEY
aws.region=YOUR_REGION
aws.sns.topic.arn=YOUR_TOPIC_ARN

Why use Topics over Direct SMS?

While Direct SMS is great for single users (like OTPs), SNS Topics are designed for broadcasting. It allows you to decouple your logic; your app doesn't need to know who the subscribers are—it just tells AWS to "send this to everyone on the list."