版本控制應用於儲存空間(Bucket)內的所有檔案(Object)。通過Object的版本管理,在錯誤覆蓋或者刪除Object後,您能夠將Bucket中儲存的Object恢複至任意時刻的歷史版本。
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同地區的其他阿里雲產品訪問OSS,請使用內網Endpoint。關於OSS支援的Region與Endpoint的對應關係,請參見OSS訪問網域名稱、資料中心、開放連接埠。
本文以從環境變數讀取存取憑證為例。如何配置訪問憑證,請參見Java配置訪問憑證。
本文以OSS網域名稱建立OSSClient為例。如果您希望通過自訂網域名、STS等方式建立OSSClient,請參見建立OSSClient。
要設定Bucket版本控制狀態,您必須具有
oss:PutBucketVersioning
許可權;要擷取Bucket版本控制狀態資訊,您必須具有oss:GetBucketVersioning
許可權。具體操作,請參見為RAM使用者授權自訂的權限原則。
設定Bucket版本控制狀態
以下代碼用於設定Bucket為開啟版本控制(Enabled)或暫停版本控制(Suspended)狀態。
重要
為Bucket設定版本控制狀態時,確保該Bucket沒有正在執行的資料複製任務以及未配置保留原則。
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;
import com.aliyun.oss.model.*;
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";
// 從環境變數中擷取訪問憑證。運行本程式碼範例之前,請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
// 填寫Bucket名稱,例如examplebucket。
String bucketName = "examplebucket";
// 填寫Bucket所在地區。以華東1(杭州)為例,Region填寫為cn-hangzhou。
String region = "cn-hangzhou";
// 建立OSSClient執行個體。
ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
OSS ossClient = OSSClientBuilder.create()
.endpoint(endpoint)
.credentialsProvider(credentialsProvider)
.clientConfiguration(clientBuilderConfiguration)
.region(region)
.build();
try {
// 設定Bucket為開啟版本控制狀態(即BucketVersioningConfiguration.ENABLED)。如需暫停Bucket的版本控制狀態,請將BucketVersioningConfiguration.ENABLED替換為BucketVersioningConfiguration.SUSPENDED。
BucketVersioningConfiguration configuration = new BucketVersioningConfiguration();
configuration.setStatus(BucketVersioningConfiguration.ENABLED);
SetBucketVersioningRequest request = new SetBucketVersioningRequest(bucketName, configuration);
ossClient.setBucketVersioning(request);
} 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();
}
}
}
}
擷取Bucket版本控制狀態資訊
以下代碼用於擷取Bucket的版本控制狀態資訊。
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;
import com.aliyun.oss.model.*;
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";
// 從環境變數中擷取訪問憑證。運行本程式碼範例之前,請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
// 填寫Bucket名稱,例如examplebucket。
String bucketName = "examplebucket";
// 填寫Bucket所在地區。以華東1(杭州)為例,Region填寫為cn-hangzhou。
String region = "cn-hangzhou";
// 建立OSSClient執行個體。
ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
OSS ossClient = OSSClientBuilder.create()
.endpoint(endpoint)
.credentialsProvider(credentialsProvider)
.clientConfiguration(clientBuilderConfiguration)
.region(region)
.build();
try {
// 擷取Bucket的版本控制狀態資訊。
BucketVersioningConfiguration versionConfiguration = ossClient.getBucketVersioning(bucketName);
System.out.println("bucket versioning status: " + versionConfiguration.getStatus());
} 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
關於管理版本控制的完整範例程式碼,請參見GitHub樣本。
關於設定Bucket版本控制狀態的API介面說明,請參見PutBucketVersioning。
關於擷取Bucket版本控制狀態的API介面說明,請參見GetBucketVersioning。