Torch Object Storage
Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceJavaIntroduction to Typical ScenesDirectory Scenario (Java SDK)
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Directory Scenario (Java SDK)
Copy pageDownload PDFDirectory Scenario (Java SDK)
TOS defines only the concept of objects and stores data internally using a flat structure. To facilitate the grouping of objects and simplify management, you can organize objects using a directory hierarchy.
Creating a Table of Contents
TOS only has the concept of objects; it is possible to create an object with a size of zero and an object name starting with/The final object simulates the functionality of a directory.
The following code demonstrates how to create the directory example_dir/ and the subdirectory example_dir/aaa/ in the bucket bucket-example.
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosClientException;
import com.volcengine.tos.TosServerException;
import com.volcengine.tos.model.object.PutObjectInput;
import com.volcengine.tos.model.object.PutObjectOutput;
public class CreateDirExample {
public static void main(String[] args) {
String endpoint = "your endpoint";
String region = "your region";
String accessKey = System.getenv("TOS_ACCESS_KEY");
String secretKey = System.getenv("TOS_SECRET_KEY");
String bucketName = "bucket-example";
String dir = "example_dir/";
String dir1 = "example_dir/aaa/";
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey);
try{
PutObjectInput putObjectInput = new PutObjectInput().setBucket(bucketName).setKey(dir).setContent(null);
PutObjectOutput output = tos.putObject(putObjectInput);
System.out.println("putObject succeed, object's etag is " + output.getEtag());
System.out.println("putObject succeed, object's crc64 is " + output.getHashCrc64ecma());
putObjectInput = new PutObjectInput().setBucket(bucketName).setKey(dir1).setContent(null);
output = tos.putObject(putObjectInput);
System.out.println("putObject succeed, object's etag is " + output.getEtag());
System.out.println("putObject succeed, object's crc64 is " + output.getHashCrc64ecma());
} catch (TosClientException e) {
System.out.println("putObject failed");
System.out.println("Message: " + e.getMessage());
if (e.getCause() != null) {
e.getCause().printStackTrace();
}
} catch (TosServerException e) {
System.out.println("putObject failed");
System.out.println("StatusCode: " + e.getStatusCode());
System.out.println("Code: " + e.getCode());
System.out.println("Message: " + e.getMessage());
System.out.println("RequestID: " + e.getRequestID());
} catch (Throwable t) {
System.out.println("putObject failed");
System.out.println("unexpected exception, message: " + t.getMessage());
}
}
}
Simulated Directory Query
You can simulate the functionality of a directory using the two parameters Delimiter and Prefix:
- First, set Delimiter to/By also setting Prefix to empty, the system can return information about objects and subdirectories in the root directory.
- When setting the Delimiter to/By simultaneously setting Prefix to the subdirectory commonPrefixes, you can return the objects and subdirectories within that subdirectory.
The following code demonstrates how to list the objects and subdirectories under the directory example_dir/ in the bucket bucket-example.
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosClientException;
import com.volcengine.tos.TosServerException;
import com.volcengine.tos.model.object.ListObjectsType2Input;
import com.volcengine.tos.model.object.ListObjectsType2Output;
import com.volcengine.tos.model.object.ListedCommonPrefix;
import com.volcengine.tos.model.object.ListedObjectV2;
public class ListDirExample {
public static void main(String[] args) {
String endpoint = "your endpoint";
String region = "your region";
String accessKey = System.getenv("TOS_ACCESS_KEY");
String secretKey = System.getenv("TOS_SECRET_KEY");
String bucketName = "bucket-example";
int maxKeys = 10;
String delimiter = "/";
String prefix = "example_dir/";
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey);
try{
boolean isTruncated = true;
String continuationToken = null;
while (isTruncated) {
ListObjectsType2Input input = new ListObjectsType2Input().setBucket(bucketName).setMaxKeys(maxKeys)
.setDelimiter(delimiter).setPrefix(prefix).setContinuationToken(continuationToken);
ListObjectsType2Output output = tos.listObjectsType2(input);
System.out.printf("listObjectsType2 succeed, is truncated? %b, next continuation token is %s.\n",
output.isTruncated(), output.getNextContinuationToken());
if (output.getContents() != null) {
for (int i = 0; i < output.getContents().size(); i++) {
ListedObjectV2 object = output.getContents().get(i);
System.out.printf("Listed object, key is %s, size is %d, storageClass is %s, ETag is %s, " +
"last modified is %s, crc64 value is %s.\n", object.getKey(), object.getSize(),
object.getStorageClass(), object.getEtag(), object.getLastModified().toString(), object.getHashCrc64ecma());
}
}
if (output.getCommonPrefixes() != null) {
for (int i = 0; i < output.getCommonPrefixes().size(); i++) {
ListedCommonPrefix commonPrefix = output.getCommonPrefixes().get(i);
System.out.println("Listed commonPrefix is " + commonPrefix.getPrefix());
listCommonPrefix(bucketName, maxKeys, delimiter, commonPrefix.getPrefix(), tos);
}
}
isTruncated = output.isTruncated();
continuationToken = output.getNextContinuationToken();
}
} catch (TosClientException e) {
System.out.println("listObjectsType2 failed");
System.out.println("Message: " + e.getMessage());
if (e.getCause() != null) {
e.getCause().printStackTrace();
}
} catch (TosServerException e) {
System.out.println("listObjectsType2 failed");
System.out.println("StatusCode: " + e.getStatusCode());
System.out.println("Code: " + e.getCode());
System.out.println("Message: " + e.getMessage());
System.out.println("RequestID: " + e.getRequestID());
} catch (Throwable t) {
System.out.println("listObjectsType2 failed");
System.out.println("unexpected exception, message: " + t.getMessage());
}
}
private static void listCommonPrefix(String bucketName, int maxKeys, String delimiter, String prefix, TOSV2 tos) {
boolean isTruncated = true;
String continuationToken = null;
while (isTruncated) {
ListObjectsType2Input input = new ListObjectsType2Input().setBucket(bucketName).setMaxKeys(maxKeys)
.setDelimiter(delimiter).setContinuationToken(continuationToken).setPrefix(prefix);
ListObjectsType2Output output = tos.listObjectsType2(input);
System.out.printf("listObjectsType2 succeed, is truncated? %b, next continuation token is %s.\n",
output.isTruncated(), output.getNextContinuationToken());
if (output.getContents() != null) {
for (int i = 0; i < output.getContents().size(); i++) {
ListedObjectV2 object = output.getContents().get(i);
System.out.printf("Listed object, key is %s, size is %d, storageClass is %s, ETag is %s, " +
"last modified is %s, crc64 value is %s.\n", object.getKey(), object.getSize(),
object.getStorageClass(), object.getEtag(), object.getLastModified().toString(), object.getHashCrc64ecma());
}
}
if (output.getCommonPrefixes() != null) {
for (int i = 0; i < output.getCommonPrefixes().size(); i++) {
ListedCommonPrefix commonPrefix = output.getCommonPrefixes().get(i);
System.out.println("Listed commonPrefix is " + commonPrefix.getPrefix());
}
}
isTruncated = output.isTruncated();
continuationToken = output.getNextContinuationToken();
}
}
}
Delete Directory
The following code demonstrates how to delete all data in the example_dir/ directory of the bucket-example bucket.
danger
In the following code, if the prefix parameter is not set (i.e., prefix isnullOr, setting prefix = "" (an empty string) will delete all object data within the bucket. Please review and use this option with extreme caution.
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosClientException;
import com.volcengine.tos.TosServerException;
import com.volcengine.tos.model.object.DeleteObjectInput;
import com.volcengine.tos.model.object.ListObjectsType2Input;
import com.volcengine.tos.model.object.ListObjectsType2Output;
public class DeleteDirExample {
public static void main(String[] args) {
String endpoint = "your endpoint";
String region = "your region";
String accessKey = System.getenv("TOS_ACCESS_KEY");
String secretKey = System.getenv("TOS_SECRET_KEY");
String bucketName = "bucket-example";
String prefix = "example_dir/";
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey);
try{
boolean isTruncated = true;
String continuationToken = null;
while (isTruncated) {
ListObjectsType2Input input = new ListObjectsType2Input().setBucket(bucketName)
.setPrefix(prefix).setContinuationToken(continuationToken);
ListObjectsType2Output output = tos.listObjectsType2(input);
if (output.getContents() != null){
for (int i = 0; i < output.getContents().size(); i++) {
String objectKey = output.getContents().get(i).getKey();
DeleteObjectInput deleteInput = new DeleteObjectInput().setBucket(bucketName)
.setKey(output.getContents().get(i).getKey());
tos.deleteObject(deleteInput);
System.out.println("deleteObject succeed, deleted key is " + objectKey);
}
}
isTruncated = output.isTruncated();
continuationToken = output.getNextContinuationToken();
}
} catch (TosClientException e) {
System.out.println("deleteObject failed");
System.out.println("Message: " + e.getMessage());
if (e.getCause() != null) {
e.getCause().printStackTrace();
}
} catch (TosServerException e) {
System.out.println("deleteObject failed");
System.out.println("StatusCode: " + e.getStatusCode());
System.out.println("Code: " + e.getCode());
System.out.println("Message: " + e.getMessage());
System.out.println("RequestID: " + e.getRequestID());
} catch (Throwable t) {
System.out.println("deleteObject failed");
System.out.println("unexpected exception, message: " + t.getMessage());
}
}
}
Last updated: 2025.09.22 11:34:15
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