AmazonS3Service.java

@Service
public class AmazonS3Service {
    private AmazonS3 s3client;

    @Value("${amazonProperties.endpointUrl}")
    private String endpointUrl;

    @Value("${amazonProperties.bucketName}")
    private String bucketName;

    @Value("${amazonProperties.accessKey}")
    private String accessKey;

    @Value("${amazonProperties.secretKey}")
    private String secretKey;

    @Autowired
    CatererRepository catererRepository;

    @Autowired
    NotificationGenerateDeliveryOrders notificationGenerateDeliveryOrders;

    @PostConstruct
    private void initializeAmazon() {
        AWSCredentials credentials = new BasicAWSCredentials(this.accessKey, this.secretKey);
        this.s3client = new AmazonS3Client(credentials);
    }

    private File convertMultiPartToFile(MultipartFile file) throws IOException {
        File convFile = new File(file.getOriginalFilename());
        FileOutputStream fos = new FileOutputStream(convFile);
        fos.write(file.getBytes());
        fos.close();
        return convFile;
    }

    private String generateFileName(MultipartFile multiPart) {
        return new Date().getTime() + "-" + multiPart.getOriginalFilename().replace(" ", "_");

    }

    private void uploadFileTos3bucket(String fileName, File file) {
        s3client.putObject(new PutObjectRequest(bucketName, fileName, file)
                .withCannedAcl(CannedAccessControlList.PublicRead));
    }

    public String uploadFile(MultipartFile multipartFile) {

        String fileUrl = "";
        try {
            File file = convertMultiPartToFile(multipartFile);
            String fileName = generateFileName(multipartFile);
            fileUrl = endpointUrl + "/" + bucketName + "/" + fileName;
            uploadFileTos3bucket(fileName, file);
            file.delete();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return fileUrl;
    }

    public String deleteFileFromS3Bucket(String fileUrl) {
        String fileName = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);
        s3client.deleteObject(new DeleteObjectRequest(bucketName + "/", fileName));
        return "Successfully deleted";
    }
}