通过Java获取S3存储桶中文件上的TAG-密钥不存在

Question

我在带有TAG的存储桶下手动标记了文件temp1.zip：key = VirusScan value = succeed。我想从代码中验证文件上的标签确实为key = VirusScan value = succeed。

AmazonS3 s3 = null;
s3 = (AmazonS3)((AmazonS3ClientBuilder)((AmazonS3ClientBuilder)AmazonS3ClientBuilder
   .standard()
   .withCredentials(new ProfileCredentialsProvider()))
   .withRegion(Regions.US_EAST_1))
   .build();
GetObjectTaggingRequest getTaggingRequest = new GetObjectTaggingRequest(bucketName, keyName);
s3.getObjectTagging(getTaggingRequest);

我在以下方面遇到例外：

s3.getObjectTagging(getTaggingRequest);

指定的键不存在。

Answer 1

此代码很好用：

package aws.example.s3;

import com.amazonaws.AmazonServiceException;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.*;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

public class GetObjectTags {


    public static void main(String[] args) throws IOException {


        if (args.length < 2) {
            System.out.println("Please specify a bucket name and key name");
            System.exit(1);
        }

        // snippet-start:[s3.java2.list_objects.main]
        String bucketName = args[0];
        String keyName = args[1];

        System.out.println("Retrieving Object Tags for  " + keyName);

        final AmazonS3 s3 = AmazonS3ClientBuilder.standard().withRegion(Regions.DEFAULT_REGION).build();

        try {

            GetObjectTaggingRequest getTaggingRequest = new GetObjectTaggingRequest(bucketName, keyName);

            GetObjectTaggingResult tags = s3.getObjectTagging(getTaggingRequest);

            List<Tag> tagSet= tags.getTagSet();

            //Iterate through the list
            Iterator<Tag> tagIterator = tagSet.iterator();

            while(tagIterator.hasNext()) {

                Tag tag = (Tag)tagIterator.next();

                System.out.println(tag.getKey());
                System.out.println(tag.getValue());
            }

        } catch (AmazonServiceException e) {
            System.err.println(e.getErrorMessage());
            System.exit(1);
        }
    }
}