[AWS S3] JAVA S3로 파일 업로드, 복사, 삭제하기

pom.xml

		<dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-s3</artifactId>
            <version>1.11.901</version>
        </dependency>

AWSS3.java

import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.CopyObjectRequest;
import com.amazonaws.services.s3.model.DeleteObjectRequest;
import com.amazonaws.services.s3.model.PutObjectRequest;
import java.io.File;

public class AWSS3 {

    //Amazon-s3-sdk 
    private AmazonS3 s3Client;
    final private String accessKey = "IAM에서 발급받은 accessKey";
    final private String secretKey = "IAM에서 발급받은 secretKey";
    private Regions clientRegion = Regions.설정한 지역;
    private String bucket = "설정한 버킷 이름";

    private AwsS3() {
        createS3Client();
    }

    //singleton pattern
    static private AwsS3 instance = null;
    
    public static AwsS3 getInstance() {
        if (instance == null) {
            return new AwsS3();
        } else {
            return instance;
        }
    }

    //aws S3 client 생성
    private void createS3Client() {

        AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
        this.s3Client = AmazonS3ClientBuilder
                .standard()
                .withCredentials(new AWSStaticCredentialsProvider(credentials))
                .withRegion(clientRegion)
                .build();
    }

    public void upload(File file, String key) {
        uploadToS3(new PutObjectRequest(this.bucket, key, file));
    }

    public void upload(InputStream is, String key, String contentType, long contentLength) {
        ObjectMetadata objectMetadata = new ObjectMetadata();
        objectMetadata.setContentType(contentType);
        objectMetadata.setContentLength(contentLength);

        uploadToS3(new PutObjectRequest(this.bucket, key, is, objectMetadata));
    }

    //PutObjectRequest는 Aws S3 버킷에 업로드할 객체 메타 데이터와 파일 데이터로 이루어져있다.
    private void uploadToS3(PutObjectRequest putObjectRequest) {

        try {
            this.s3Client.putObject(putObjectRequest);
            System.out.println(String.format("[%s] upload complete", putObjectRequest.getKey()));

        } catch (AmazonServiceException e) {
            e.printStackTrace();
        } catch (SdkClientException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void copy(String orgKey, String copyKey) {
        try {
            //Copy 객체 생성
            CopyObjectRequest copyObjRequest = new CopyObjectRequest(
                    this.bucket,
                    orgKey,
                    this.bucket,
                    copyKey
            );
            //Copy
            this.s3Client.copyObject(copyObjRequest);

            System.out.println(String.format("Finish copying [%s] to [%s]", orgKey, copyKey));

        } catch (AmazonServiceException e) {
            e.printStackTrace();
        } catch (SdkClientException e) {
            e.printStackTrace();
        }
    }

    public void delete(String key) {
        try {
            //Delete 객체 생성
            DeleteObjectRequest deleteObjectRequest = new DeleteObjectRequest(this.bucket, key);
            //Delete
            this.s3Client.deleteObject(deleteObjectRequest);
            System.out.println(String.format("[%s] deletion complete", key));

        } catch (AmazonServiceException e) {
            e.printStackTrace();
        } catch (SdkClientException e) {
            e.printStackTrace();
        }
    }


}

Main.java

import java.io.File;

public class Main {

    public AwsS3 awsS3 = AwsS3.getInstance();

    public static void main(String[] args) {

        Main main = new Main();

        File file = new File("D://sdaff.png");
        String key = "img/my-img.png";
        String copyKey = "img/my-img-copy.png";

        main.upload(file, key);
//        main.copy(key, copyKey);
//        main.delete(key);
    }

    public void upload(File file, String key) {
        awsS3.upload(file, key);
    }

    public void copy(String orgKey, String copyKey) {
        awsS3.copy(orgKey, copyKey);
    }

    public void delete(String key) {
        awsS3.delete(key);
    }

}