如何将FileInputStream转换为S3ObjectInputStream

Question

我想将File InputStream转换为S3ObjectInputStream，我尝试了以下方式，但它没有成功，我得到了

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

这是我的代码

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

Answer 1

你需要演员作为InputStream

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

希望能帮助到你

Answer 2

使用构造函数

new S3ObjectInputStream(InputStream in, ...

我使用了aws-java-sdk版本1.11.526