A bucket is a container for objects stored in OSS. Every object is contained in a bucket. This topic describes how to determine whether a bucket exists.

The following code provides an example on how to determine whether a specific bucket exists:

// This example uses the endpoint of the China (Hangzhou) region. Specify the actual endpoint based on your requirements.
String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";
// Security risks may arise if you use the AccessKey pair of an Alibaba Cloud account to log on to OSS, because the account has permissions on all API operations. We recommend that you use your RAM user's credentials to call API operations or perform routine operations and maintenance. To create your RAM user, log on to https://ram.console.aliyun.com.
String accessKeyId = "<yourAccessKeyId>";
String accessKeySecret = "<yourAccessKeySecret>";

// Create an OSSClient instance.
OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

boolean exists = ossClient.doesBucketExist("<yourBucketName>");

// Shut down the OSSClient instance.
ossClient.shutdown();