Java函数在无服务器架构中与消息队列的集成

// 处理 SQS 消息的 Lambda 函数
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.SQSEvent;
import com.amazonaws.services.lambda.runtime.events.SQSEvent.SQSMessage;

public class MessageQueueHandler 
        implements RequestHandler<SQSEvent, String> {

    @Override
    public String handleRequest(SQSEvent event, Context context) {
        // 从 SQS 消息中提取消息体
        SQSMessage message = event.getRecords().get(0);
        String messageBody = message.getBody();
        
        // 处理消息体并返回结果
        return "Processed message: " + messageBody;
    }
}

# 创建 Amazon SQS 队列
aws sqs create-queue \
--queue-name my-queue \
--region us-east-1

# 部署 Lambda 函数
aws lambda create-function \
--function-name my-function \
--runtime java8.al2 \
--handler MessageQueueHandler \
--role arn:aws:iam::ACCOUNT_ID:role/lambda-basic-execution-role \
--code S3Bucket=my-bucket,S3Key=my-function.zip \
--environment Variables={QUEUE_URL=arn:aws:sqs:REGION:ACCOUNT_ID:my-queue}