config, controller, model, repository, service, application.java

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AWSConfiguration {

@Value("${cloud.aws.credentials.accessKey}")
private String accessKey;

@Value("${cloud.aws.credentials.secretKey}")
private String secretKey;

@Value("${cloud.aws.region}")
private String region;

@Bean
public BasicAWSCredentials basicAWSCredentials() {
    return new BasicAWSCredentials(accessKey, secretKey);
}

@Bean
public AmazonS3 amazonS3Client(AWSCredentials awsCredentials) {
    AmazonS3ClientBuilder builder = AmazonS3ClientBuilder.standard();
    builder.withCredentials(new AWSStaticCredentialsProvider(awsCredentials));
    builder.setRegion(region);
    AmazonS3 amazonS3 = builder.build();
    return amazonS3;
}

import com.amazonaws.services.s3.AmazonS3;


   import com.amazonaws.services.s3.model.*;
   import org.apache.commons.io.IOUtils;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.beans.factory.annotation.Value;
   import org.springframework.http.HttpHeaders;
   import org.springframework.http.HttpStatus;
   import org.springframework.http.MediaType;
   import org.springframework.http.ResponseEntity;
   import org.springframework.stereotype.Service;
   import org.springframework.util.StringUtils;
   import org.springframework.web.multipart.MultipartFile;

   import java.io.FileInputStream;
   import java.io.FileNotFoundException;
   import java.io.IOException;
   import java.io.InputStream;
   import java.net.URLEncoder;
   import java.util.ArrayList;
   import java.util.Arrays;
   import java.util.List;

   @Service
   public class S3Service {

   @Autowired
   private AmazonS3 amazonS3;

   @Value("${cloud.aws.s3.bucket}")
   private String bucket;

   private PutObjectResult upload(String filePath, String uploadKey)
  throws FileNotFoundException {
    return upload(new FileInputStream(filePath), uploadKey);
}

private PutObjectResult upload(InputStream inputStream, String uploadKey) {
    PutObjectRequest putObjectRequest = new PutObjectRequest(bucket, uploadKey, inputStream, new ObjectMetadata());

    putObjectRequest.setCannedAcl(CannedAccessControlList.PublicRead);

    PutObjectResult putObjectResult = amazonS3.putObject(putObjectRequest);

    IOUtils.closeQuietly(inputStream);

    return putObjectResult;
}

public List<PutObjectResult> upload(MultipartFile[] multipartFiles) {
    List<PutObjectResult> putObjectResults = new ArrayList<>();

    Arrays.stream(multipartFiles)
            .filter(multipartFile -> !StringUtils.isEmpty(multipartFile.getOriginalFilename()))
            .forEach(multipartFile -> {
                try {
                    putObjectResults.add(upload(multipartFile.getInputStream(), multipartFile.getOriginalFilename()));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });

    return putObjectResults;
}

public ResponseEntity<byte[]> download(String key) throws IOException {
    GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, key);

    S3Object s3Object = amazonS3.getObject(getObjectRequest);

    S3ObjectInputStream objectInputStream = s3Object.getObjectContent();

    byte[] bytes = IOUtils.toByteArray(objectInputStream);

    String fileName = URLEncoder.encode(key, "UTF-8").replaceAll("\+", "%20");

    HttpHeaders httpHeaders = new HttpHeaders();
    httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    httpHeaders.setContentLength(bytes.length);
    httpHeaders.setContentDispositionFormData("attachment", fileName);

    return new ResponseEntity<>(bytes, httpHeaders, HttpStatus.OK);
}

public List<S3ObjectSummary> list() {
    ObjectListing objectListing = amazonS3.listObjects(new ListObjectsRequest().withBucketName(bucket));

    List<S3ObjectSummary> s3ObjectSummaries = objectListing.getObjectSummaries();

    return s3ObjectSummaries;
  }
}

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.cloud.aws.context.support.io.ResourceLoaderBeanPostProcessor#0': Cannot resolve reference to bean 'amazonS3' while setting constructor argument;"