S3多文件下载Java SDK

要使用Java SDK进行S3多文件下载，你可以按照以下步骤进行操作：

1. 导入必要的依赖：

import software.amazon.awssdk.core.ResponseBytes;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectResponse;
import software.amazon.awssdk.services.s3.model.ListObjectsV2Response;
import software.amazon.awssdk.services.s3.model.S3Object;

2. 创建S3 Client对象：

S3Client s3Client = S3Client.create();

3. 使用listObjectsV2方法获取S3存储桶中的对象列表：

ListObjectsV2Response response = s3Client.listObjectsV2(builder -> builder.bucket("your-bucket-name"));
List<S3Object> objects = response.contents();

4. 遍历对象列表，使用getObject方法下载每个对象：

for (S3Object object : objects) {
    ResponseBytes<GetObjectResponse> objectData = s3Client.getObject(builder -> builder.bucket("your-bucket-name").key(object.key()));
    byte[] data = objectData.asByteArray();
    // 处理下载的数据
}

完整的代码示例如下所示：

import software.amazon.awssdk.core.ResponseBytes;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectResponse;
import software.amazon.awssdk.services.s3.model.ListObjectsV2Response;
import software.amazon.awssdk.services.s3.model.S3Object;

import java.util.List;

public class S3MultiFileDownloadExample {

    public static void main(String[] args) {
        S3Client s3Client = S3Client.create();

        ListObjectsV2Response response = s3Client.listObjectsV2(builder -> builder.bucket("your-bucket-name"));
        List<S3Object> objects = response.contents();

        for (S3Object object : objects) {
            ResponseBytes<GetObjectResponse> objectData = s3Client.getObject(builder -> builder.bucket("your-bucket-name").key(object.key()));
            byte[] data = objectData.asByteArray();
            // 处理下载的数据
        }

        s3Client.close();
    }
}

请将"your-bucket-name"替换为你要下载文件的S3存储桶名称。