How to Send SMS Using AWS SNS with Topic in Java | AWS SNS SMS Messaging with Topics in Java

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How to Send SMS using AWS SNS Topics in Java

Using AWS Simple Notification Service (SNS) topics is a powerful way to broadcast messages to multiple subscribers simultaneously. In this guide, we’ll walk through the entire process—from setting up your AWS environment to writing the Java code that publishes SMS alerts.

1. Key Concepts: The SNS Workflow

Before diving into the code, it's important to understand the three main parts of this workflow:

• Publisher: Your Java application that sends the message.
• Topic: A logical access point and communication channel.
• Subscriber: The phone number (endpoint) that receives the SMS from the topic.

2. Important Prerequisites

Before you run the program, ensure your environment is ready:

1. AWS Credentials: Your ~/.aws/credentials file must have a valid Access Key and Secret Key.
2. Permissions: The IAM user must have SNS:Publish permissions (e.g., AmazonSNSFullAccess).
3. SMS Sandbox: If your account is in sandbox mode, you must add and verify your destination phone number in the AWS Console under SNS -> Mobile -> Text messaging (SMS).

3. Step-by-Step Java Implementation

We will break our Java program into three clear steps:

Step A: Create the SNS Topic

First, we initialize the SnsClient and request AWS to create a new topic name. This returns a unique Topic ARN (Amazon Resource Name).

Step B: Subscribe the Phone Number

Using the Topic ARN from Step A, we subscribe a phone number using the SMS protocol. This links the phone number to the channel.

Step C: Publish the Message

Finally, we send a PublishRequest to the Topic ARN. Every number subscribed to that topic will receive your text message!

Conclusion

Mastering SNS topics allows you to scale your notifications easily. Whether you are sending alerts to one person or thousands, the topic-based approach is efficient and robust.