不推荐使用AmazonS3Client（凭据）

Question

我正在尝试阅读Amazon S3上可用的文件，因为问题解释了问题。我找不到已弃用的构造函数的替代调用。

这是代码：

private String AccessKeyID = "xxxxxxxxxxxxxxxxxxxx";
private String SecretAccessKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
private static String bucketName     = "documentcontainer";
private static String keyName     = "test";
//private static String uploadFileName    = "/PATH TO FILE WHICH WANT TO UPLOAD/abc.txt";

AWSCredentials credentials = new BasicAWSCredentials(AccessKeyID, SecretAccessKey);

void downloadfile() throws IOException
{

    // Problem lies here - AmazonS3Client is deprecated
    AmazonS3 s3client = new AmazonS3Client(credentials);
        try {
        System.out.println("Downloading an object...");
        S3Object s3object = s3client.getObject(new GetObjectRequest(
                bucketName, keyName));
        System.out.println("Content-Type: "  +
                s3object.getObjectMetadata().getContentType());
        InputStream input = s3object.getObjectContent();

        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        while (true) {
            String line = reader.readLine();
            if (line == null) break;

            System.out.println("    " + line);
        }
        System.out.println();
    } catch (AmazonServiceException ase) {
          //do something
    } catch (AmazonClientException ace) {
        // do something
    }
 }

有帮助吗？如果需要更多解释，请提及。我查看了SDK的.zip文件中提供的示例代码，它是一样的。

Answer 1

您可以使用AmazonS3ClientBuilder或AwsClientBuilder作为替代品。

对于S3，最简单的是AmazonS3ClientBuilder，

BasicAWSCredentials creds = new BasicAWSCredentials("access_key", "secret_key"); 
AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(creds)).build();

Answer 2

使用下面列出的代码创建没有凭据的S3客户端：

AmazonS3 s3Client = AmazonS3ClientBuilder.standard().build();

用法示例是调用S3的lambda函数。

Answer 3

您可以按如下方式创建S3默认客户端（使用aws-java-sdk-s3-1.11.232）：

AmazonS3ClientBuilder.defaultClient();