注意事項

• 本文以華東1（杭州）外網Endpoint為例。如果您希望通過與OSS同地域的其他阿里云產品訪問OSS，請使用內網Endpoint。關于OSS支持的Region與Endpoint的對應關系，請參見OSS訪問域名、數據中心、開放端口。

• 本文以從環境變量讀取訪問憑證為例。如何配置訪問憑證，請參見Java配置訪問憑證。

• 本文以OSS域名新建OSSClient為例。如果您希望通過自定義域名、STS等方式新建OSSClient，請參見新建OSSClient。

• 要判斷存儲空間是否存在，您必須具有oss:GetBucketAcl權限。具體操作，請參見為RAM用戶授權自定義的權限策略。

示例代碼

以下代碼用于判斷存儲空間examplebucket是否存在：

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;

public class Demo {

    public static void main(String[] args) throws Exception {
        // Endpoint以華東1（杭州）為例，其它Region請按實際情況填寫。
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 填寫Bucket所在地域。以華東1（杭州）為例，Region填寫為cn-hangzhou。
        String region = "cn-hangzhou";
        
        // 從環境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();

        // 創建OSSClient實例。
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();

        try {
            // 判斷存儲空間examplebucket是否存在。如果返回值為true，則存儲空間存在，如果返回值為false，則存儲空間不存在。
            boolean exists = ossClient.doesBucketExist("examplebucket");
            System.out.println(exists);
        } 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();
            }
        }
    }
}

相關文檔

關于判斷存儲空間是否存在的完整示例代碼，請參見GitHub示例。