如何使用Java检查给定的S3存储桶中是否存在指定的键

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private AmazonS3 s3;
public boolean exists(String path, String name) {
    try {
        s3.getObjectMetadata(bucket, getS3Path(path) + name); 
    } catch(AmazonServiceException e) {
        return false;
    return true;
}

try {
    AmazonS3 s3 = new AmazonS3Client(new ClasspathPropertiesFileCredentialsProvider());
    String bucketName = getBucketName();
    s3.createBucket(bucketName);
    S3Object object = s3.getObject(bucketName, getKey());
} catch (AmazonServiceException e) {
    String errorCode = e.getErrorCode();
    if (!errorCode.equals("NoSuchKey")) {
        throw e;
    Logger.getLogger(getClass()).debug("No such key!!!", e);
}

 public bool Exists(string key)
        using (Amazon.S3.AmazonS3Client client = (Amazon.S3.AmazonS3Client)Amazon.AWSClientFactory.CreateAmazonS3Client(m_accessKey, m_accessSecret))
            ListObjectsRequest request = new ListObjectsRequest();
            request.BucketName = m_bucketName;
            request.Prefix = key;
            using (ListObjectsResponse response = client.ListObjects(request))
                foreach (S3Object o in response.S3Objects)
                    if( o.Key == key )
                        return true;
                return false;
    }.

public static boolean isExistS3(String accessKey, String secretKey, String bucketName, String file) {
    // Amazon-s3 credentials
    AWSCredentials myCredentials = new BasicAWSCredentials(accessKey, secretKey); 
    AmazonS3Client s3Client = new AmazonS3Client(myCredentials); 
    ObjectListing objects = s3Client.listObjects(new ListObjectsRequest().withBucketName(bucketName).withPrefix(file));
    for (S3ObjectSummary objectSummary: objects.getObjectSummaries()) {
        if (objectSummary.getKey().equals(file)) {
            return true;
    return false;
}

$bucket = "MyBucket";
$key = "MyKey";
$s3 = Aws\S3\S3Client->factory([...]);
$s3->registerStreamWrapper();
$keyExists = file_exists("s3://$bucket/$key");

ProviderCredentials awsCredentials = new AWSCredentials(
                awsaccessKey,
                awsSecretAcessKey);
        // REST implementation of S3Service
        RestS3Service restService = new RestS3Service(awsCredentials);
        // check whether file exists in bucket
        if (restService.isObjectInBucket(bucket, objectKey)) {
            //your logic
        }

String bucket = ...;
String objectInBucket = ...;
AmazonS3 s3 = new AmazonS3Client(...);
return s3.doesBucketExist(bucket) 
       && !s3.listObjects(bucket, objectInBucket).getObjectSummaries().isEmpty();

boolean isExist(String key)
        ObjectListing objects = amazonS3.listObjects(new ListObjectsRequest().withBucketName(bucketName).withPrefix(key));
        for (S3ObjectSummary objectSummary : objects.getObjectSummaries())
            if (objectSummary.getKey().equals(key))
                return true;
        return false;
    }

import io.minio.MinioClient;
import io.minio.errors.MinioException;
import java.io.InputStream;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import org.xmlpull.v1.XmlPullParserException;
public class GetObject {
  public static void main(String[] args)
    throws NoSuchAlgorithmException, IOException, InvalidKeyException, XmlPullParserException, MinioException {
    // Note: YOUR-ACCESSKEYID, YOUR-SECRETACCESSKEY and my-bucketname are
    // dummy values, please replace them with original values.
    // Set s3 endpoint, region is calculated automatically
    MinioClient s3Client = new MinioClient("https://s3.amazonaws.com", "YOUR-ACCESSKEYID", "YOUR-SECRETACCESSKEY");
    InputStream stream = s3Client.getObject("my-bucketname", "my-objectname");
    byte[] buf = new byte[16384];
    int bytesRead;
    while ((bytesRead = stream.read(buf, 0, buf.length)) >= 0) {
      System.out.println(new String(buf, 0, bytesRead));
    stream.close();
}

public boolean exists(String bucket, String key) {
    try {
        HeadObjectResponse headResponse = client
                .headObject(HeadObjectRequest.builder().bucket(bucket).key(key).build());
        return true;
    } catch (NoSuchKeyException e) {
        return false;
}

public boolean existsOnS3 () throws Exception {
    try {
       S3Client s3Client = S3Client.builder ().credentialsProvider (...).build ();
       HeadObjectRequest headObjectRequest = HeadObjectRequest.builder ().bucket ("my-bucket").key ("key/to/file/house.pdf").build ();
       HeadObjectResponse headObjectResponse = s3Client.headObject (headObjectRequest);
       return headObjectResponse.sdkHttpResponse ().isSuccessful ();    
   catch (NoSuchKeyException e) {

如何使用Java检查给定的S3存储桶中是否存在指定的键

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