如何通過 aws Java SDK 公開 S3 object？

Question

如何通過 AWS Java SDK 公開 S3 object？

具體來說，通過 Java AWS SDK 可以使用哪些 API 方法使上傳的 Z497031794414A55543 公開？

Answer 1

在亞馬遜 AWS 論壇中找到了答案。

return s3Client.putObject(
   new PutObjectRequest(bucketName, objectKey, inputStream, metadata)
      .withCannedAcl(CannedAccessControlList.PublicRead));

答案是

.withCannedAcl(CannedAccessControlList.PublicRead)

Answer 2

另一種方法可以更精細地控制允許查看 object 的人員（僅限所有用戶或經過身份驗證的用戶）：

    PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, keyName, image);
    AccessControlList acl = new AccessControlList();
    acl.grantPermission(GroupGrantee.AllUsers, Permission.Read); //all users or authenticated
    putObjectRequest.setAccessControlList(acl);
    s3client.putObject(putObjectRequest);

Answer 3

s3client.setObjectAcl("bucketName[/subDirectory]", fileName, CannedAccessControlList.PublicRead);
URL url = s3client.getUrl("bucketName[/subDirectory]", fileName);
String sharableLink = url.toExternalForm();

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