将 GetObject 和 Amazon SDK 搭配使用

获取目录存储桶中的一个对象。

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.core.ResponseBytes;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectRequest;
import software.amazon.awssdk.services.s3.model.GetObjectResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;

import java.nio.charset.StandardCharsets;
import java.nio.file.Path;

import static com.example.s3.util.S3DirectoryBucketUtils.createDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.createS3Client;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteAllObjectsInDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.getFilePath;
import static com.example.s3.util.S3DirectoryBucketUtils.putDirectoryBucketObject;

    /**
     * Retrieves an object from the specified S3 directory bucket.
     *
     * @param s3Client   The S3 client used to interact with S3
     * @param bucketName The name of the directory bucket
     * @param objectKey  The key (name) of the object to be retrieved
     * @return The retrieved object as a ResponseInputStream
     */
    public static boolean getDirectoryBucketObject(S3Client s3Client, String bucketName, String objectKey) {
        logger.info("Retrieving object: {} from bucket: {}", objectKey, bucketName);

        try {
            // Create a GetObjectRequest
            GetObjectRequest objectRequest = GetObjectRequest.builder()
                    .key(objectKey)
                    .bucket(bucketName)
                    .build();

            // Retrieve the object as bytes
            ResponseBytes<GetObjectResponse> objectBytes = s3Client.getObjectAsBytes(objectRequest);
            byte[] data = objectBytes.asByteArray();

            // Print object contents to console
            String objectContent = new String(data, StandardCharsets.UTF_8);
            logger.info("Object contents: \n{}", objectContent);

            return true;

        } catch (S3Exception e) {
            logger.error("Failed to retrieve object: {} - Error code: {}", e.awsErrorDetails().errorMessage(),
                    e.awsErrorDetails().errorCode(), e);
            return false;
        }
    }