在检查响应对象之前，请确保您在请求中提供了正确的参数，否则将返回空响应。同时，确保所有表都存在并且授权访问。以下示例代码可用于请求一个有两个表项的表。

import java.util.HashMap;
import java.util.Map;

import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.BatchGetItemRequest;
import com.amazonaws.services.dynamodbv2.model.BatchGetItemResult;
import com.amazonaws.services.dynamodbv2.model.KeysAndAttributes;

public class BatchGetItemExample {

    public static void main(String[] args) {
        String accessKey = "ACCESS_KEY";
        String secretKey = "SECRET_KEY";
        BasicAWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);

        AmazonDynamoDBClient client = new AmazonDynamoDBClient(credentials);
        client.setEndpoint("dynamodb.us-west-2.amazonaws.com");

        Map requestItems = new HashMap();
        requestItems.put("Table1", new KeysAndAttributes().withKeys(new AttributeValue().withS("key1")));
        requestItems.put("Table2", new KeysAndAttributes().withKeys(new AttributeValue().withS("key2")));

        BatchGetItemRequest batchGetItemRequest = new BatchGetItemRequest().withRequestItems(requestItems);
        BatchGetItemResult result = client.batchGetItem(batchGetItemRequest);

        if (result.getResponses().isEmpty()) {
            System.out.println("Response is empty!");
        } else {
            System.out.println("Response: " + result.getResponses().toString());
        }
    }
}