Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceJavaData ProcessingImage ProcessingImage Processing Persistence (Java SDK)
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Image Processing Persistence (Java SDK)
Copy pageDownload PDFImage Processing Persistence (Java SDK)
TOS does not store a processed image by default. You can use code to save the processed images to the specified storage bucket. This article describes how to use the TOS Java SDK to save processed images to a designated storage bucket.
Category
- To store a processed image, you must have the read permission on the source bucket and write permission on the target bucket.
- Images processed by an anonymous user must be stored in a publicly writable bucket.
- The source and target buckets must be in the same region.
- By default, the processed image is set to Private and stored in Standard Storage.
- Only Java SDK version 2.6.2 supports image processing persistence functionality.
Sample Code
The following code demonstrates how to fix the image height at 100px, convert the image format to JPG, rename the processed image to temp.jpg, and save it to the bucket-example storage bucket.
import com.fasterxml.jackson.core.JacksonException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosClientException;
import com.volcengine.tos.TosServerException;
import com.volcengine.tos.internal.util.TosUtils;
import com.volcengine.tos.model.object.GetObjectV2Input;
import com.volcengine.tos.model.object.GetObjectV2Output;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class ImageSaveAsExample {
static class SaveAsResult {
String bucket;
String fileSize;
String object;
String status;
@Override
public String toString() {
return "SaveAsResult{" +
"bucket='" + bucket + '\'' +
", fileSize='" + fileSize + '\'' +
", object='" + object + '\'' +
", status='" + status + '\'' +
'}';
}
}
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 objectKey = "image.png";
String style = "image/resize,h_100/format,jpg";
String saveBucket = "bucket-example";
String saveObject = "temp.jpg";
TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey);
try {
GetObjectV2Input input = new GetObjectV2Input().setBucket(bucketName).setKey(objectKey).setProcess(style)
.setSaveBucket(Base64.getUrlEncoder().encodeToString(saveBucket.getBytes(StandardCharsets.UTF_8)))
.setSaveObject(Base64.getUrlEncoder().encodeToString(saveObject.getBytes(StandardCharsets.UTF_8)));
try (ByteArrayOutputStream stream = new ByteArrayOutputStream();
GetObjectV2Output output = tos.getObject(input)) {
byte[] buffer = new byte[1024];
int length;
while ((length = output.getContent().read(buffer)) != -1) {
stream.write(buffer, 0, length);
}
String respBody = stream.toString("UTF-8");
System.out.println("Image inspect success, inspect info is " + respBody);
SaveAsResult result = TosUtils.getJsonMapper().readValue(respBody, new TypeReference<SaveAsResult>() {
});
System.out.println(result.toString());
} catch (JacksonException e) {
System.out.println("parse response data failed");
e.printStackTrace();
} catch (IOException e) {
System.out.println("read response data failed");
e.printStackTrace();
}
} catch (TosClientException e) {
System.out.println("Image saveAs failed");
System.out.println("Message: " + e.getMessage());
if (e.getCause() != null) {
e.getCause().printStackTrace();
}
} catch (TosServerException e) {
System.out.println("Image saveAs 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("Image saveAs failed");
System.out.println("unexpected exception, message: " + t.getMessage());
}
}
}
Related documentation
For a detailed introduction to image processing persistence, please refer to Image Processing Persistence.
Last updated: 2025.09.22 11:34:18
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