管理对象标签

以下示例演示如何使用Amazon SDK for Java为新对象设置标签并检索或替换现有对象的标签。有关对象标签的更多信息，请参阅使用标签对存储进行分类。有关创建和测试有效示例的说明，请参阅《Amazon SDK for Java 开发人员指南》中的入门。

import com.amazonaws.AmazonServiceException;
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.*;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class ManagingObjectTags {

    public static void main(String[] args) {
        Regions clientRegion = Regions.DEFAULT_REGION;
        String bucketName = "*** Bucket name ***";
        String keyName = "*** Object key ***";
        String filePath = "*** File path ***";

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

            // Create an object, add two new tags, and upload the object to Amazon S3.
            PutObjectRequest putRequest = new PutObjectRequest(bucketName, keyName, new File(filePath));
            List<Tag> tags = new ArrayList<Tag>();
            tags.add(new Tag("Tag 1", "This is tag 1"));
            tags.add(new Tag("Tag 2", "This is tag 2"));
            putRequest.setTagging(new ObjectTagging(tags));
            PutObjectResult putResult = s3Client.putObject(putRequest);

            // Retrieve the object's tags.
            GetObjectTaggingRequest getTaggingRequest = new GetObjectTaggingRequest(bucketName, keyName);
            GetObjectTaggingResult getTagsResult = s3Client.getObjectTagging(getTaggingRequest);

            // Replace the object's tags with two new tags.
            List<Tag> newTags = new ArrayList<Tag>();
            newTags.add(new Tag("Tag 3", "This is tag 3"));
            newTags.add(new Tag("Tag 4", "This is tag 4"));
            s3Client.setObjectTagging(new SetObjectTaggingRequest(bucketName, keyName, new ObjectTagging(newTags)));
        } 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();
        }
    }
}

以下示例演示如何使用Amazon SDK for .NET为新对象设置标签并检索或替换现有对象的标签。有关对象标签的更多信息，请参阅使用标签对存储进行分类。

有关设置和运行代码示例的信息，请参阅《适用于 .NET 的 Amazon SDK 开发人员指南》中的适用于 .NET 的 Amazon SDK 入门。

using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace Amazon.DocSamples.S3
{
    public class ObjectTagsTest
    {
        private const string bucketName = "*** bucket name ***";
        private const string keyName = "*** key name for the new object ***";
        private const string filePath = @"*** file path ***";
        // Specify your bucket region (an example region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2;
        private static IAmazonS3 client;

        public static void Main()
        {
            client = new AmazonS3Client(bucketRegion);
            PutObjectWithTagsTestAsync().Wait();
        }

        static async Task PutObjectWithTagsTestAsync()
        {
            try
            {
                // 1. Put an object with tags.
                var putRequest = new PutObjectRequest
                {
                    BucketName = bucketName,
                    Key = keyName,
                    FilePath = filePath,
                    TagSet = new List<Tag>{
                        new Tag { Key = "Keyx1", Value = "Value1"},
                        new Tag { Key = "Keyx2", Value = "Value2" }
                    }
                };

                PutObjectResponse response = await client.PutObjectAsync(putRequest);
                // 2. Retrieve the object's tags.
                GetObjectTaggingRequest getTagsRequest = new GetObjectTaggingRequest
                {
                    BucketName = bucketName,
                    Key = keyName
                };

                GetObjectTaggingResponse objectTags = await client.GetObjectTaggingAsync(getTagsRequest);
                for (int i = 0; i < objectTags.Tagging.Count; i++)
                    Console.WriteLine("Key: {0}, Value: {1}", objectTags.Tagging[i].Key, objectTags.Tagging[i].Value);


                // 3. Replace the tagset.

                Tagging newTagSet = new Tagging();
                newTagSet.TagSet = new List<Tag>{
                    new Tag { Key = "Key3", Value = "Value3"},
                    new Tag { Key = "Key4", Value = "Value4" }
                };


                PutObjectTaggingRequest putObjTagsRequest = new PutObjectTaggingRequest()
                {
                    BucketName = bucketName,
                    Key = keyName,
                    Tagging = newTagSet
                };
                PutObjectTaggingResponse response2 = await client.PutObjectTaggingAsync(putObjTagsRequest);

                // 4. Retrieve the object's tags.
                GetObjectTaggingRequest getTagsRequest2 = new GetObjectTaggingRequest();
                getTagsRequest2.BucketName = bucketName;
                getTagsRequest2.Key = keyName;
                GetObjectTaggingResponse objectTags2 = await client.GetObjectTaggingAsync(getTagsRequest2);
                for (int i = 0; i < objectTags2.Tagging.Count; i++)
                    Console.WriteLine("Key: {0}, Value: {1}", objectTags2.Tagging[i].Key, objectTags2.Tagging[i].Value);

            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine(
                        "Error encountered ***. Message:'{0}' when writing an object"
                        , e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine(
                    "Encountered an error. Message:'{0}' when writing an object"
                    , e.Message);
            }
        }
    }
}