使用預先簽章來共用物件 URLs

下列範例會產生預先簽章URL，您可以提供給其他人，讓他們可以從 S3 on Outposts 儲存貯體擷取物件。如需詳細資訊，請參閱在 Outposts 上使用 URLs S3 預先簽章。若要使用此範例，請取代 使用者輸入預留位置 使用您自己的資訊。

import com.amazonaws.AmazonServiceException;
import com.amazonaws.HttpMethod;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.GeneratePresignedUrlRequest;

import java.io.IOException;
import java.net.URL;
import java.time.Instant;

public class GeneratePresignedURL {

    public static void main(String[] args) throws IOException {
        Regions clientRegion = Regions.DEFAULT_REGION;
        String accessPointArn = "*** access point ARN ***";
        String objectKey = "*** object key ***";

        try {
            AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .withRegion(clientRegion)
                    .withCredentials(new ProfileCredentialsProvider())
                    .build();

            // Set the presigned URL to expire after one hour.
            java.util.Date expiration = new java.util.Date();
            long expTimeMillis = Instant.now().toEpochMilli();
            expTimeMillis += 1000 * 60 * 60;
            expiration.setTime(expTimeMillis);

            // Generate the presigned URL.
            System.out.println("Generating pre-signed URL.");
            GeneratePresignedUrlRequest generatePresignedUrlRequest =
                    new GeneratePresignedUrlRequest(accessPointArn, objectKey)
                            .withMethod(HttpMethod.GET)
                            .withExpiration(expiration);
            URL url = s3Client.generatePresignedUrl(generatePresignedUrlRequest);

            System.out.println("Pre-Signed URL: " + url.toString());
        } catch (AmazonServiceException e) {
            // The call was transmitted successfully, but Amazon S3 couldn't process 
            // it, so it returned an error response.
            e.printStackTrace();
        } catch (SdkClientException e) {
            // Amazon S3 couldn't be contacted for a response, or the client
            // couldn't parse the response from Amazon S3.
            e.printStackTrace();
        }
    }
}

下列範例會產生預先簽章URL，您可以提供給其他人，讓他們可以從 S3 on Outposts 儲存貯體擷取物件。如需詳細資訊，請參閱在 Outposts 上使用 URLs S3 預先簽章。若要使用此範例，請取代 使用者輸入預留位置 使用您自己的資訊。

using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using System;

namespace Amazon.DocSamples.S3
{
    class GenPresignedURLTest
    {
        private const string accessPointArn = "*** access point ARN ***"; 
        private const string objectKey = "*** object key ***";
        // Specify how long the presigned URL lasts, in hours.
        private const double timeoutDuration = 12;
        // Specify your bucket Region (an example Region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2;
        private static IAmazonS3 s3Client;

        public static void Main()
        {
            s3Client = new AmazonS3Client(bucketRegion);
            string urlString = GeneratePreSignedURL(timeoutDuration);
        }
        static string GeneratePreSignedURL(double duration)
        {
            string urlString = "";
            try
            {
                GetPreSignedUrlRequest request1 = new GetPreSignedUrlRequest
                {
                    BucketName = accessPointArn,
                    Key = objectKey,
                    Expires = DateTime.UtcNow.AddHours(duration)
                };
                urlString = s3Client.GetPreSignedURL(request1);
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine("Error encountered on server. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
            }
            return urlString;
        }
    }
}