为什么我的图像没有问题地从本地服务器上传到Aws S3，却没有从我的AWS弹性豆堆栈服务器上传？

Question

这是我在弹性beantalk中遇到的错误图像：

当我在Elastic Bean Stack上尝试将图像上传到AWS S3时，出现权限拒绝错误消息。在我的本地服务器上一切正常。

    package com.mll.applicationv1.aws;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import javax.annotation.PostConstruct;
import java.io.*;
import java.util.Date;

@Service
public class AmazonClient{
    private Logger logger = LoggerFactory.getLogger(AmazonClient.class);
    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;
    @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.PublicReadWrite));
    }
    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";
    }



}