Java – spring cloud AWS code did not find S3 file

I don't understand why the spring AWS cloud code didn't find my S3 file My spring bean XML configuration has' AWS context: context resource loader ' I thought the use of resources was as seamless as spring. Classpath: resources are easy to use

I know that AWS permissions and credentials are configured correctly, because if I use Amazon S3 client directly, I can retrieve the file in question

Starting from the spring side, AWS credentials should be found automatically

This is a valid Amazon S3 client code:

public static void main(String [] args) throws IOException {
  AmazonS3 s3Client = new AmazonS3Client(new DefaultAWSCredentialsProviderChain());
  System.out.println(s3Client.doesObjectExist("MyBucket","sample/resource.txt"));
  S3Object object = s3Client.getObject(new GetObjectRequest("MyBucket","sample/resource.txt"));
  String result = StreamUtils.copyToString(object.getObjectContent(),Charset.forName("UTF-8"));
  System.out.println(result);    
}

The following is the spring cloud AWS equivalent for which the same S3 file was not found:

public class App {
    public static void main(String[] args) throws IOException {
        final AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext("app-context.xml");
        ctx.scan("bdf.sample.spring");
        S3Resource s3Resource = ctx.getBean("S3Resource",S3Resource.class);
        InputStream resource = s3Resource.getResource("s3://MyBucket/sample/resource.txt");
        String result = StreamUtils.copyToString(resource,Charset.forName("UTF-8"));
        System.out.println(result);
    }
}

I have a system. In the s3resource constructor that displays this resourceloader out. println：

The exceptions I get are:

S3Resource：

package bdf.sample.spring;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.io.InputStream;

@Service("S3Resource")
public class S3Resource  {
    private final ResourceLoader resourceLoader;

    @Autowired
    public S3Resource(ResourceLoader resourceLoader) {
        this.resourceLoader = resourceLoader;
        System.out.println(resourceLoader.getClass());
    }
    public InputStream getResource(String path) throws IOException {
        final Resource resource = resourceLoader.getResource(path);
        return resource.getInputStream();
    }
}

Finally, my spring XML

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aws-context="http://www.springframework.org/schema/cloud/aws/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/cloud/aws/context
        http://www.springframework.org/schema/cloud/spring-cloud-aws-context.xsd">

    <aws-context:context-resource-loader/>
    <aws-context:context-region region="us-east-1"/>
</beans>

The GitHub link is basically the same as the following code: https://github.com/BDF/SpringCloudSample

Solution

One problem is that resourceloader supports S3 instead of reading the region attribute