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

这是将 inputStream 转换为 S3Object inputstream 的方法。确保 src/test/resources 文件夹中存在模拟 S3 文件

private S3ObjectInputStream getMockS3Content() {
        InputStream inputStream = Thread.currentThread()
            .getContextClassLoader()
            .getResourceAsStream("mockS3content.json");
        S3ObjectInputStream s3ObjectInputStream = new S3ObjectInputStream(inputStream,null);
        return s3ObjectInputStream;
    }

Answer 2

您需要投射为InputStream

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

希望有所帮助

Answer 3

使用构造函数

new S3ObjectInputStream(InputStream in, ...

我使用了aws-java-sdk版本1.11.526