当您希望针对Bucket中的某个具体的Object设置特定的读写权限时，可以使用Object ACL。通过设置Object ACL，可以精确控制某个Object的访问权限，且不影响Bucket中其他Object的访问权限。Object ACL包含公共读、公共读写、私有。您可以在上传Object时设置ACL，也可以在Object上传后根据自己的业务需求随时修改ACL。
操作步骤
使用阿里云SDK
仅支持通过Java SDK设置Object ACL，Java SDK要求3.15.0及以上版本。
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.CannedAccessControlList;
import com.aliyun.oss.common.auth.CredentialsProviderFactory;
import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;
public class Demo {
public static void main(String[] args) throws Exception {
// 填写云盒Bucket的数据域名。
String endpoint = "https://cb-f8z7yvzgwfkl9q0h****.cn-hangzhou.oss-cloudbox.aliyuncs.com";
// 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
// 填写云盒Bucket名称，例如examplebucket。
String bucketName = "examplebucket";
// 填写云盒Bucket所在地域。
String region = "cn-hangzhou";
// 填写云盒ID。
String cloudBoxId = "cb-f8z7yvzgwfkl9q0h****";
// 填写不包含Bucket名称在内的Object完整路径，例如testfolder/exampleobject.txt。
String objectName = "testfolder/exampleobject.txt";
// 创建OSSClient实例。
ClientBuilderConfiguration conf = new ClientBuilderConfiguration();
conf.setSignatureVersion(SignVersion.V4);
OSS ossClient = OSSClientBuilder.create()
.endpoint(endpoint)
.credentialsProvider(new DefaultCredentialProvider(credentialsProvider.getCredentials()))
.clientConfiguration(conf)
.region(region)
.cloudBoxId(cloudBoxId)
.build();
try {
// 设置Object的访问权限为私有。
ossClient.setObjectAcl(bucketName, objectName, CannedAccessControlList.Private);
} 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();
}
}
}
}
使用REST API
如果您的程序自定义要求较高，您可以直接发起REST API请求。直接发起REST API请求需要手动编写代码计算签名。更多信息，请参见PutObjectACL。