java s3 for v2 下载目录
时间: 2023-08-12 19:04:09 浏览: 48
以下是使用 Java SDK v2 下载 S3 目录的示例代码:
```java
import software.amazon.awssdk.core.ResponseBytes;
import software.amazon.awssdk.core.async.AsyncRequestBody;
import software.amazon.awssdk.core.async.AsyncResponseTransformer;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3AsyncClient;
import software.amazon.awssdk.services.s3.model.*;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import java.util.concurrent.CompletableFuture;
public class S3DirectoryDownloader {
public static void main(String[] args) {
// 定义 S3 存储桶名称和目录路径
String bucketName = "your-bucket-name";
String directoryPath = "your-directory/";
// 配置 S3 客户端
Region region = Region.US_EAST_1;
S3AsyncClient s3AsyncClient = S3AsyncClient.builder().region(region).build();
// 获取目录中的所有对象
ListObjectsV2Request listRequest = ListObjectsV2Request.builder().bucket(bucketName).prefix(directoryPath).build();
ListObjectsV2Response listResponse = s3AsyncClient.listObjectsV2(listRequest).join();
List<S3Object> objects = listResponse.contents();
// 下载目录中的所有对象
for (S3Object object : objects) {
Path path = Paths.get(object.key());
String fileName = path.getFileName().toString();
String localFilePath = "/path/to/local/directory/" + fileName;
GetObjectRequest getRequest = GetObjectRequest.builder()
.bucket(bucketName)
.key(object.key())
.build();
CompletableFuture<ResponseBytes<GetObjectResponse>> response = s3AsyncClient
.getObject(getRequest, AsyncResponseTransformer.toBytes());
response.thenAccept(res -> {
byte[] bytes = res.asByteArray();
AsyncRequestBody requestBody = AsyncRequestBody.fromBytes(bytes);
WriteRequest writeRequest = WriteRequest.builder().bucket(bucketName).key(object.key()).build();
PutObjectRequest putRequest = PutObjectRequest.builder()
.bucket(bucketName)
.key(object.key())
.build();
s3AsyncClient.putObject(putRequest, requestBody).join();
}).join();
}
// 关闭 S3 客户端
s3AsyncClient.close();
}
}
```
这个示例代码使用异步方式下载目录中的所有对象,并将它们保存到本地目录中。在实际使用中,您可能需要根据具体的需求对代码进行修改。请注意,此示例代码仅供参考,不适用于所有情况。