Object Storage Service:Create a bucket (Java SDK V1)

Usage notes

• In this topic, the public endpoint of the China (Hangzhou) region is used. To access OSS from other Alibaba Cloud services in the same region, use an internal endpoint. For details about supported regions and endpoints, see OSS regions and endpoints.

• In this topic, access credentials are obtained from environment variables. For more information about how to configure access credentials, see Configure access credentials.

• In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Configuration examples for common scenarios.

• From 10:00 (UTC+8) on October 13, 2025, OSS will implement a phased adjustment across all regions to enable Block public access by default for new buckets created using the API, OSS SDKs, or ossutil. For details about the exact times when the adjustment will take effect in each region, see [Official Announcement] Adjustment to Public Access Blocking Configurations for Newly Created Buckets. Once Block Public Access is enabled, you cannot configure public access permissions, including public ACLs (public read and public read/write) and bucket policies that allows public access. You can disable this feature after the bucket is created if your business requires public access.

Permissions

By default, an Alibaba Cloud account has full permissions. RAM users or RAM roles under an Alibaba Cloud account do not have any permissions by default. The Alibaba Cloud account or account administrator must grant operation permissions through RAM Policy or Bucket policies.

Sample code

The following code shows how to create a bucket named examplebucket.

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        // Set yourEndpoint to the Endpoint of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the Endpoint to https://oss-cn-hangzhou.aliyuncs.com.
        String endpoint = "yourEndpoint";
        // Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the bucket name.
        String bucketName = "examplebucket";
        // Specify the resource group ID. If you do not specify a resource group ID, the bucket belongs to the default resource group.
        //String rsId = "rg-aek27tc****";
        // Specify the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set Region to cn-hangzhou.
        String region = "cn-hangzhou";
        
        // Create an OSSClient instance.
        // When the OSSClient instance is no longer in use, call the shutdown method to release resources.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();

        try {
            // Create a bucket and enable the hierarchical namespace feature.
            CreateBucketRequest createBucketRequest = new CreateBucketRequest(bucketName).withHnsStatus(HnsStatus.Enabled);
            // To specify the storage class, ACL, and data redundancy type when you create the bucket, see the following code.
            // This example shows how to set the storage class of the bucket to Standard.
            createBucketRequest.setStorageClass(StorageClass.Standard);
            // The default data redundancy type is LRS, which is DataRedundancyType.LRS.
            createBucketRequest.setDataRedundancyType(DataRedundancyType.LRS);
            // Set the ACL of the bucket to public-read. The default ACL is private.
            createBucketRequest.setCannedACL(CannedAccessControlList.PublicRead);
            // When you create a bucket in a region that supports resource groups, you can configure a resource group for the bucket.
            //createBucketRequest.setResourceGroupId(rsId);

            ossClient.createBucket(createBucketRequest);

            // Create the bucket.
            ossClient.createBucket(createBucketRequest);
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

References

• For the complete sample code that is used to create a bucket, see the GitHub example.

• For more information about the API operation that you can call to create a bucket, see PutBucket.