我想做什么？-我想使用DynamoDBMapper将一批记录保存到DynamoDB。模型类packagemodel;importcom.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAttribute;importcom.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAutoGeneratedKey;importcom.amazonaws.services.dynamodbv2.datamodeling.DynamoDBDocument;importcom.amazonaws