我们如何从亚马逊 s3 存储桶中获取查看 url 和下载 url？

Question

Uploaded file with two methods. Method 1 . file is MultipartFile type

InputStream input =file.getInputStream();
   ObjectMetadata metadata=new ObjectMetadata();
   metadata.setContentLength(file.getSize());
   amazon.putObject(bucketName, fileName,input,metadata);

Method 2 . fileObj is of file type

amazon.putObject(bucketName, fileName,fileObj); 

Output:- String url = amazon.getUrl(bucketName, fileName).toExternalForm();

Method 1: - If I hit the url, it gets downloaded

Method 2: - If I hit the url, it can view from the browser.

How do I achieve both view and download from any one method? Also which is more convenient and effective. Thanks in advance.

Answer 1

If an object is uploaded to Amazon S3 with Content-Type metadata, the browser can understand its format and display it (if it knows how).

It would appear that this happens automatically with your Method 2, but boto3 is unable to detect the Content-Type when using Method 1. You would need to add this metadata yourself to produce the same result as Method 2.

To control what is viewed and downloaded, do it in your HTML:

<a href="...">View object</a>
<a href="..." download>Download object</a>