Dependency Setup
- Ensure you have the AWS SDK for Java added to your project. If you're using Maven, include the required dependency in your
pom.xml file.
- For Gradle users, add the dependency to your
build.gradle.
<dependency>
<groupId>com.amazonaws</groupId>
<artifactId>aws-java-sdk-sns</artifactId>
<version>1.12.96</version>
</dependency>
implementation 'com.amazonaws:aws-java-sdk-sns:1.12.96'
Creating AWS SNS Client
- Use the AWS credentials file at
~/.aws/credentials or configure the default credential provider chain.
- Initialize the AWS SNS client using the AWS SDK.
AmazonSNS snsClient = AmazonSNSClientBuilder.standard()
.withRegion(Regions.US_EAST_1)
.build();
Creating a Topic
- Create a new SNS topic or reference an existing one. SNS topics are where notifications are published.
CreateTopicRequest createTopicRequest = new CreateTopicRequest("myTopicName");
CreateTopicResult createTopicResult = snsClient.createTopic(createTopicRequest);
String topicArn = createTopicResult.getTopicArn();
Publish a Message
- Use the
publish method to send messages to your SNS topic.
PublishRequest publishRequest = new PublishRequest(topicArn, "This is my message", "Subject of message");
PublishResult publishResult = snsClient.publish(publishRequest);
System.out.println("MessageId: " + publishResult.getMessageId());
Subscribe to Topic
- A subscription must be confirmed before receiving notifications. Use the
subscribe method to subscribe endpoints like email or SMS.
SubscribeRequest subscribeRequest = new SubscribeRequest(topicArn, "email", "example@example.com");
SubscribeResult subscribeResult = snsClient.subscribe(subscribeRequest);
System.out.println("Subscription ARN: " + subscribeResult.getSubscriptionArn());
Handling Notifications
- The subscriber of an SNS topic can be an HTTP/S endpoint, email, or even another AWS service. Ensure your endpoints are capable of processing the incoming notifications.
- For HTTP/S endpoints, verify message signatures to ensure authenticity of the messages.
Error Handling and Logging
- Implement proper exception handling to gracefully capture any errors that occur during the communication with SNS.
- Use logging frameworks like Log4j or SLF4J to log events such as message publication and subscription confirmations.
