可以使用 Amazon SQS 提供的 Batch APIs 来批量发送 SQS 消息，以提高推送性能。

具体代码示例：

import software.amazon.awssdk.services.sqs.SqsClient;
import software.amazon.awssdk.services.sqs.model.SendMessageBatchRequest;
import software.amazon.awssdk.services.sqs.model.SendMessageBatchRequestEntry;
import software.amazon.awssdk.services.sqs.model.SendMessageBatchResponse;
import java.util.ArrayList;
import java.util.List;

public class SQSClient {
    private final SqsClient sqsClient;

    public SQSClient() {
        this.sqsClient = SqsClient.create();
    }

    public String sendMessage(String messageBody) {
        SendMessageBatchRequest sendMessageBatchRequest = createSendMessageBatchRequest(messageBody);
        SendMessageBatchResponse response = sqsClient.sendMessageBatch(sendMessageBatchRequest);
        return response.sdkHttpResponse().statusText().get();
    }

    private SendMessageBatchRequest createSendMessageBatchRequest(String messageBody) {
        List entries = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            String message = messageBody + i;
            SendMessageBatchRequestEntry entry =
                    SendMessageBatchRequestEntry.builder().id("message_" + i).messageBody(message).build();
            entries.add(entry);
        }
        return SendMessageBatchRequest.builder().queueUrl("queue-url").entries(entries).build();
    }
}

通过创建 SendMessageBatchRequest 对象并将其传递给 sendMessageBatch 方法，可以批量发送消息。在上面的代码示例中，我们使用 createSendMessageBatchRequest 方法创建了一个包含 10 条消息的 SendMessageBatchRequest 对象，并将其传递给 sendMessageBatch 方法。这将发送一批消息到指定的队列，并且不需要为每个消息调用一次 sendMessage 方法。这样可以显着改善推送性能。