在亚马逊aws论坛中找到了答案。
return s3Client.putObject( new PutObjectRequest(bucketName, objectKey, inputStream, metadata) .withCannedAcl(CannedAccessControlList.PublicRead));
答案是
.withCannedAcl(CannedAccessControlList.PublicRead)

在亚马逊aws论坛中找到了答案。
return s3Client.putObject( new PutObjectRequest(bucketName, objectKey, inputStream, metadata) .withCannedAcl(CannedAccessControlList.PublicRead));
答案是
.withCannedAcl(CannedAccessControlList.PublicRead)