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Object Storage Service:Salvar imagens processadas

Última atualização: Sep 01, 2026

Por padrão, o Object Storage Service (OSS) processa as imagens de origem com base nos parâmetros das solicitações de processamento de imagem (IMG), mas não salva os resultados. Para exibir repetidamente o mesmo resultado de processamento, como miniaturas, imagens recortadas ou convertidas, salve a imagem processada. Para salvar uma imagem processada como um objeto em um bucket específico, adicione o parâmetro saveas à solicitação IMG.

Observações

  • Permissões necessárias

    Para salvar uma imagem processada, você precisa da permissão oss:PostProcessTask no bucket de origem, além das permissões oss:PutBucket no bucket de destino e oss:PutObject no objeto de destino.

  • Regiões de armazenamento

    É possível salvar a imagem processada no mesmo bucket da imagem de origem ou em um bucket diferente. No entanto, ambos devem pertencer à mesma conta Alibaba Cloud e estar localizados na mesma região.

  • Método de armazenamento

    Ao usar um SDK para salvar imagens processadas, o processamento ocorre no servidor do OSS e a imagem resultante é gravada diretamente no bucket especificado. Não é necessário baixar a imagem para o dispositivo local e fazer upload novamente. Adicione o parâmetro saveas para salvar a imagem processada via SDK em um bucket específico. Para mais informações, consulte Examples on how to save processed images by using Alibaba Cloud SDKs. Observe que não há suporte para salvar diretamente os resultados de processamento de uma URL de arquivo em um bucket específico. Recomendamos salvar a imagem processada no dispositivo local e, em seguida, fazer o upload para o bucket desejado.

  • ACL

    A lista de controle de acesso (ACL) da imagem processada é idêntica à do bucket onde a imagem será salva e não pode ser personalizada.

  • Duração do armazenamento

    Caso precise ajustar a duração do armazenamento da imagem processada, configure uma política de expiração adequada usando lifecycle rules.

Operações

Use Alibaba Cloud SDKs

Os exemplos de código a seguir mostram como salvar imagens processadas usando os SDKs do OSS para linguagens de programação comuns. Para obter mais informações sobre como salvar imagens processadas com outros SDKs, consulte SDK overview.

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.common.utils.IOUtils;
import com.aliyun.oss.model.GenericResult;
import com.aliyun.oss.model.ProcessObjectRequest;
import java.util.Formatter;

public class Demo {
    public static void main(String[] args) throws Throwable {
        // In this example, the endpoint of the China (Hangzhou) region is used. Specify your actual endpoint. 
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the name of the bucket. Example: examplebucket. 
        String bucketName = "examplebucket";
        // Specify the full path of the object. Do not include the bucket name in the full path. 
        String sourceImage = "exampleimage.png";
        // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        // Call the shutdown method to release resources when the OSSClient is no longer in use. 
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();

        try {
            // Resize the image to a height and width of 100 pixels. 
            StringBuilder sbStyle = new StringBuilder();
            Formatter styleFormatter = new Formatter(sbStyle);
            String styleType = "image/resize,m_fixed,w_100,h_100";
            // Name the processed image example-resize.png and save the image to the bucket in which the source image is stored. 
            // Specify the full path of the object. Do not include the bucket name in the full path. 
            String targetImage = "example-resize.png";
            styleFormatter.format("%s|sys/saveas,o_%s,b_%s", styleType,
                    BinaryUtil.toBase64String(targetImage.getBytes()),
                    BinaryUtil.toBase64String(bucketName.getBytes()));
            System.out.println(sbStyle.toString());
            ProcessObjectRequest request = new ProcessObjectRequest(bucketName, sourceImage, sbStyle.toString());
            GenericResult processResult = ossClient.processObject(request);
            String json = IOUtils.readStreamAsString(processResult.getResponse().getContent(), "UTF-8");
            processResult.getResponse().getContent().close();
            System.out.println(json);
        } 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();
            }
        }
    }
}
<?php
if (is_file(__DIR__ . '/../autoload.php')) {
    require_once __DIR__ . '/../autoload.php';
}
if (is_file(__DIR__ . '/../vendor/autoload.php')) {
    require_once __DIR__ . '/../vendor/autoload.php';
}
use OSS\Credentials\EnvironmentVariableCredentialsProvider;
use OSS\OssClient;

// Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set.
$provider = new EnvironmentVariableCredentialsProvider();
// Set yourEndpoint to the endpoint of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com.
$endpoint = "yourEndpoint";
// Set the bucket name. For example, examplebucket.
$bucket= "examplebucket";
// Set the full path of the source object. For example, exampledir/exampleobject.jpg. The full path cannot include the bucket name.
$object = "exampledir/exampleobject.jpg";
// Set the full path of the destination object. For example, example-new.jpg.
$save_object = "example-new.jpg";

function base64url_encode($data)
{
    return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
}

$config = array(
        "provider" => $provider,
        "endpoint" => $endpoint,
        "signatureVersion" => OssClient::OSS_SIGNATURE_VERSION_V4,
        "region"=> "cn-hangzhou"
    );
    $ossClient = new OssClient($config);
// If the source image is not in the specified bucket, upload the image to the bucket.
// $ossClient->uploadFile($bucket, $object, "D:\\localpath\\exampleobject.jpg");

// Resize the image to a fixed width and height of 100 px, and then rotate it 90 degrees.
$style = "image/resize,m_fixed,w_100,h_100/rotate,90";

$process = $style.
           '|sys/saveas'.
           ',o_'.base64url_encode($save_object).
           ',b_'.base64url_encode($bucket);

// Name the processed image example-new.png and save it to the current bucket.
$result = $ossClient->processObject($bucket, $object, $process);
// Print the processing result.
print($result);
const OSS = require('ali-oss');

const client = new OSS({
  // Specify the region in which the bucket is located. For example, if your bucket is located in the China (Hangzhou) region, set the region to oss-cn-hangzhou.
  region: 'yourregion',
  // Obtain access credentials from environment variables. Before you execute the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
  accessKeyId: process.env.OSS_ACCESS_KEY_ID,
  accessKeySecret: process.env.OSS_ACCESS_KEY_SECRET,
  authorizationV4: true,
  // Specify the name of your bucket.
  bucket: 'yourbucketname'
});

const sourceImage = 'sourceObject.png';
const targetImage = 'targetObject.jpg';
async function processImage(processStr, targetBucket) {
  const result = await client.processObjectSave(
    sourceImage,
    targetImage,
    processStr,
    targetBucket
  );
  console.log(result.res.status);
}

// Resize the image and configure the destination bucket that is used to save the processed image.
processImage("image/resize,m_fixed,w_100,h_100", "target bucket")

// Crop the image and configure the destination bucket that is used to save the processed image.
processImage("image/crop,w_100,h_100,x_100,y_100,r_1", "target bucket")

// Rotate the image and configure the destination bucket that is used to save the processed image.
processImage("image/rotate,90", "target bucket")

// Sharpen the image and configure the destination bucket that is used to save the processed image.
processImage("image/sharpen,100", "target bucket")

// Add watermarks to the image and configure the destination bucket that is used to save the processed image.
processImage("image/watermark,text_SGVsbG8g5Zu-54mH5pyN5YqhIQ", "target bucket")

// Convert the format of the image and configure the destination bucket that is used to save the processed image.
processImage("image/format,jpg", "target bucket")
# -*- coding: utf-8 -*-
import os
import base64
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider

# Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"
# Specify the ID of the region that maps to the endpoint. Example: cn-hangzhou. This parameter is required if you use the signature algorithm V4.
region = "cn-hangzhou"

# Specify the name of the bucket. 
bucket = oss2.Bucket(auth, endpoint, "examplebucket", region=region)

# Specify the name of the bucket in which the source image is stored. 
source_bucket_name = 'srcbucket'
# Specify the name of the bucket in which you want to save the processed image. The bucket must be within the same region as the bucket in which the source image is stored. 
target_bucket_name = 'destbucket'
# Specify the name of the source image. If the image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: example/example.jpg. 
source_image_name = 'example/example.jpg'

# Resize the image to 100 × 100 pixels. 
style = 'image/resize,m_fixed,w_100,h_100'
# Specify the name of the processed image. If the image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: exampledir/example.jpg. 
target_image_name = 'exampledir/example.jpg'
process = "{0}|sys/saveas,o_{1},b_{2}".format(style, 
    oss2.compat.to_string(base64.urlsafe_b64encode(oss2.compat.to_bytes(target_image_name))),
    oss2.compat.to_string(base64.urlsafe_b64encode(oss2.compat.to_bytes(target_bucket_name))))
result = bucket.process_object(source_image_name, process)
print(result)
// fromBucket and toBucket specify the source and destination bucket names.
// fromObjectKey and toObjectKey specify the source and destination object names. The names must be full paths that include the file extension, for example, abc/efg/123.jpg.
// action specifies the image processing operation, such as "image/resize,m_lfit,w_100,h_100".
ImagePersistRequest request = new ImagePersistRequest(fromBucket,fromObjectKey,toBucket,toObjectKey,action);

        OSSAsyncTask task = oss.asyncImagePersist(request, new OSSCompletedCallback<ImagePersistRequest, ImagePersistResult>() {
            @Override
            public void onSuccess(ImagePersistRequest request, ImagePersistResult result) {
                // Success callback
                log.i("info", "Success");
            }

            @Override
            public void onFailure(ImagePersistRequest request, ClientException clientException, ServiceException serviceException) {
              // The request failed.
              if (clientException != null) {
                  // A client-side exception occurred, such as a network error.
                  clientException.printStackTrace();
              }
              if (serviceException != null) {
                  // A server-side exception occurred.
                  Log.e("ErrorCode", serviceException.getErrorCode());
                  Log.e("RequestId", serviceException.getRequestId());
                  Log.e("HostId", serviceException.getHostId());
                  Log.e("RawMessage", serviceException.getRawMessage());
              }
            }
        });
package main

import (
	"encoding/base64"
	"fmt"
	"os"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func HandleError(err error) {
    fmt.Println("Error:", err)
    os.Exit(-1)
}

func main() {
    // Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
    provider, err := oss.NewEnvironmentVariableCredentialsProvider()
    if err != nil {
    fmt.Println("Error:", err)
    os.Exit(-1)
    }

    // Create an OSSClient instance. 
    // Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
    // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. Specify the actual region.
    clientOptions := []oss.ClientOption{oss.SetCredentialsProvider(&provider)}
    clientOptions = append(clientOptions, oss.Region("yourRegion"))
    // Specify the version of the signature algorithm.
    clientOptions = append(clientOptions, oss.AuthVersion(oss.AuthV4))
    client, err := oss.New("yourEndpoint", "", "", clientOptions...)
    if err != nil {
	    HandleError(err)
    }

    // Specify the name of the bucket in which the source image is stored. Example: srcbucket. 
    bucketName := "SourceBucketName"
    bucket, err := client.Bucket(bucketName)
    if err != nil {
    HandleError(err)
    }
    // Specify the name of the source image. If the source image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: example/example.jpg. 
    sourceImageName := "yourObjectName"
    // Specify the name of the bucket to which you want to store the processed image. The bucket must be located in the same region as the bucket in which the source image is stored. 
    targetBucketName := "TargetBucketName"
    // Specify the name of the processed image. If the processed image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: exampledir/example.jpg. 
    targetImageName := "TargetObjectName"
    // Resize the image to 100 x 100 pixels and save the image to a specific bucket. 
    style := "image/resize,m_fixed,w_100,h_100"
    process := fmt.Sprintf("%s|sys/saveas,o_%v,b_%v", style, base64.URLEncoding.EncodeToString([]byte(targetImageName)), base64.URLEncoding.EncodeToString([]byte(targetBucketName)))
    result, err := bucket.ProcessObject(sourceImageName, process)
    if err != nil {
    HandleError(err)
    } else {
    fmt.Println(result)
    }
}
OSSImagePersistRequest *request = [OSSImagePersistRequest new];
// Specify the name of the bucket in which the source image is stored. 
request.fromBucket = @"srcbucket";
// Specify the name of the source image. If the image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: exampledir/src.jpg. 
request.fromObject = @"exampledir/src.jpg";
// Specify the name of the bucket that stores the processed image. The bucket must be located in the same region as the bucket in which the source image is stored. 
request.toBucket = @"destbucket";
// Specify the name of the processed image.
request.toObject = @"exampledir/dest.jpg";
// Proportionally resize the image to a width of 100 pixels and save the processed image to the specified bucket. 
request.action = @"image/resize,w_100";
// request.action = @"resize,w_100";
OSSTask * getTask = [client imageActionPersist:request];

[getTask continueWithBlock:^id _Nullable(OSSTask * _Nonnull task) {
    return nil;
}];
// [getTask waitUntilFinished];
#include <alibabacloud/oss/OssClient.h>
#include <sstream>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* Initialize the OSS account information. */
            
    /* Set yourEndpoint to the Endpoint of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the Endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "yourEndpoint";
    /* Set yourRegion to the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the Region to cn-hangzhou. */
    std::string Region = "yourRegion";
    /* Specify the bucket name, for example, examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the name of the source image. If the image is not in the root directory of the bucket, include the full path, for example, example/example.jpg. */
    std::string SourceObjectName = "example/example.jpg";
    /* Specify the name of the processed image. If the image is not in the root directory of the bucket, include the full path, for example, exampledir/example.jpg. */
    std::string TargetObjectName = "exampledir/example.jpg";

    /* Initialize network resources. */
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    /* Resize the image to a fixed width and height of 100 px and save it to the current bucket. */
    std::string Process = "image/resize,m_fixed,w_100,h_100";
    std::stringstream ss;
    ss  << Process 
    <<"|sys/saveas"
    << ",o_" << Base64EncodeUrlSafe(TargetObjectName)
    << ",b_" << Base64EncodeUrlSafe(BucketName);
    ProcessObjectRequest request(BucketName, SourceObjectName, ss.str());
    auto outcome = client.ProcessObject(request);
    if (outcome.isSuccess()) {
    std::cout << "Image processed successfully." << std::endl;
    } else {
    std::cout << "Failed to process image. Error code: " << outcome.error().Code()
              << ", Message: " << outcome.error().Message()
              << ", RequestId: " << outcome.error().RequestId() << std::endl;
    }

    /* Release network resources. */
    ShutdownSdk();
    return 0;
}

Use RESTful APIs

Se o seu cenário exigir alto nível de personalização, chame diretamente as operações da API RESTful. Para chamar uma API RESTful diretamente, inclua o cálculo da assinatura no seu código.

Ao utilizar o parâmetro saveas, inclua as seguintes opções:

Opção

Descrição

o

Nome do objeto sob o qual a imagem processada será armazenada. O valor desta opção deve estar codificado em Base64 seguro para URL. Para mais informações, consulte Watermark encoding.

b

Nome do bucket onde a imagem processada será armazenada. Este valor também deve estar codificado em Base64 seguro para URL. Se esta opção não for especificada, a imagem processada será salva no bucket atual.

Utilize um dos métodos abaixo para processar uma imagem e salvá-la em um bucket específico:

  • O exemplo a seguir demonstra como configurar parâmetros IMG para processar uma imagem e salvar o resultado em um bucket específico:

    POST /ObjectName?x-oss-process HTTP/1.1
    Host: oss-example.oss.aliyuncs.com
    Content-Length: 247
    Date: Fri, 04 May 2012 03:21:12 GMT
    Authorization: OSS4-HMAC-SHA256 Credential=LTAI********************/20250417/cn-hangzhou/oss/aliyun_v4_request,AdditionalHeaders=content-length,Signature=a7c3554c729d71929e0b84489addee6b2e8d5cb48595adfc51868c299c0c218e
    
    // Proportionally resize the source image named test.jpg to a width of 100 pixels and save the processed image to the bucket named test.
    x-oss-process=image/resize,w_100|sys/saveas,o_dGVzdC5qcGc,b_dGVzdA
  • Este exemplo ilustra o uso de um estilo de imagem para processar e salvar o resultado em um bucket específico:

    POST /ObjectName?x-oss-process HTTP/1.1
    Host: oss-example.oss.aliyuncs.com
    Content-Length: 247
    Date: Fri, 04 May 2012 03:22:13 GMT
    Authorization: OSS4-HMAC-SHA256 Credential=LTAI********************/20250417/cn-hangzhou/oss/aliyun_v4_request,AdditionalHeaders=content-length,Signature=a7c3554c729d71929e0b84489addee6b2e8d5cb48595adfc51868c299c0c218e
    
    // Use an image style named examplestyle to process the source image named test.jpg and save the processed image to the bucket named test.
    x-oss-process=style/examplestyle|sys/saveas,o_dGVzdC5qcGc,b_dGVzdA