How to convert FileInputStream to S3ObjectInputStream

Question

I want to convert a FileInputStream to a S3ObjectInputStream.

This is my current code:

InputStream is = new FileInputStream(file);
S3ObjectInputStream sObject = (S3ObjectInputStream)is;

However, it's giving the error:

java.io.FileInputStream cannot be cast to com.amazonaws.services.s3.model.S3ObjectInputStream

Answer 1

Use the below constructor to convert an InputStream to a S3ObjectInputStream:

var s3ObjectInputStream = new S3ObjectInputStream(inputStream, null);

You can safely use null for the 2nd argument in the constructor (HttpRequestBase) as the abort method which uses it, isn't available in the cast InputStream.