使用Spring提供的异步处理来代替Thread.sleep()。

在实现SqsListener接口的类中，可以使用@Async注解来表明接收到消息时需要异步处理。具体代码示例如下：

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;
import com.amazonaws.services.sqs.model.Message;
import com.amazonaws.services.sqs.AmazonSQSAsync;

@Component
public class MySqsListener implements SqsListener {

    private final AmazonSQSAsync amazonSQSAsync;

    public MySqsListener(AmazonSQSAsync amazonSQSAsync) {
        this.amazonSQSAsync = amazonSQSAsync;
    }

    @Async
    @Override
    public void onMessage(Message message, SqsMessageVisibility visibility) {
        // do some asynchronous processing with the message

        // once you have processed the message, delete it from the queue
        amazonSQSAsync.deleteMessageAsync(visibility.getVisibilityId(), visibility.getQueueUrl());
    }
}

使用@Async注解可以让onMessage()方法在接收到消息时异步执行，不会阻塞主线程。处理完成后，使用AmazonSQSAsync对象异步删除消息，避免了使用Thread.sleep()方法的需要。