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Glossary
DocumentationCloud Object StorageSDK DocumentationJava SDKImage ProcessingPersistent Image Processing

Persistent Image Processing

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Last updated: 2024-02-02 16:51:03

Overview

The following example shows how to automatically process an image when you upload it to COS.
When the image is uploaded successfully, COS(Cloud Object Storage) will save both the input and output images. You can later obtain the processing results using a general download request.

Persistent Image Processing upon Upload

Sample code

  // The bucket name must contain "appid".
// For the API description, please see https://www.tencentcloud.com/document/product/436/54050?from_cn_redirect=1
String bucketName = "examplebucket-1250000000";

String key = "test.jpg";
File localFile = new File("E://test.jpg");
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, localFile);
PicOperations picOperations = new PicOperations();
picOperations.setIsPicInfo(1);
// Add image processing rules.
List<PicOperations.Rule> ruleList = new LinkedList<>();
PicOperations.Rule rule1 = new PicOperations.Rule();
rule1.setBucket(bucketName);
rule1.setFileId("test-1.jpg");
rule1.setRule("imageMogr2/rotate/90");
ruleList.add(rule1);
PicOperations.Rule rule2 = new PicOperations.Rule();
rule2.setBucket(bucketName);
rule2.setFileId("test-2.jpg");
rule2.setRule("imageMogr2/rotate/180");
ruleList.add(rule2);
picOperations.setRules(ruleList);
putObjectRequest.setPicOperations(picOperations);
try {
    PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
    CIUploadResult ciUploadResult = putObjectResult.getCiUploadResult();
    System.out.println(putObjectResult.getRequestId());
    System.out.println(ciUploadResult.getOriginalInfo().getEtag());
    for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
        System.out.println(ciObject.getLocation());
        System.out.println(ciObject.getEtag());
    }
} catch (CosServiceException e) {
    e.printStackTrace();
} catch (CosClientException e) {
    e.printStackTrace();
}

Parameter description

The PicOperations class is used to record image operations. Its members are described as follows:
Member
Description
Type
isPicInfo
Whether to return the input image information.
0: No (default)
1: Yes
int
rules
Processing rules (up to 5 rules are supported). Each rule corresponds to one processing result. If this parameter is not specified, images will not be processed.
List

Response parameters

The CIUploadResult class is used to return the image processing results. Its members are described as follows:
Member
Description
Type
originalInfo
Input image information
OriginalInfo
processResults
Processing results
ProcessResults
The OriginalInfo class is used to record the input image information. Its members are described as follows:
Member
Description
Type
key
Name of the input image
String
location
Location of the input image
String
imageInfo
Input image information
ImageInfo
etag
ETag of the input image. If the output image overwrites the input image, the value of etag will be that of the output image
String
The ImageInfo class is used to record the input image information. Its members are described as follows:
Member
Description
Type
format
Format
String
width
Image width
Integer
height
Image height
Integer
quality
Image quality
Integer
ave
Average hue of the image
String
orientation
Rotation angle of the image
Integer
The ProcessResults class is used to record the image processing results. Its members are described as follows:
Member
Description
Type
objectList
Processing results of each image
List
The CIObject class is used to record the processing result of a single image. Its members are described as follows:
Member
Description
Type
key
Filename
String
location
Location of the image
String
format
Image format
String
width
Image width
Integer
height
Image height
Integer
size
Image size
Integer
quality
Image quality
Integer
etag
ETag of the output image
String

Processing an In-Cloud Image

The following example shows how to process an in-cloud image and store the processing result in COS.

Sample code

String bucketName = "examplebucket-1250000000";
String key = "test.jpg";
ImageProcessRequest imageReq = new ImageProcessRequest(bucketName, key);

PicOperations picOperations = new PicOperations();
picOperations.setIsPicInfo(1);
List<PicOperations.Rule> ruleList = new LinkedList<>();
PicOperations.Rule rule1 = new PicOperations.Rule();
rule1.setBucket(bucketName);
rule1.setFileId("test-1.jpg");
rule1.setRule("imageMogr2/rotate/90");
ruleList.add(rule1);
PicOperations.Rule rule2 = new PicOperations.Rule();
rule2.setBucket(bucketName);
rule2.setFileId("test-2.jpg");
rule2.setRule("imageMogr2/rotate/180");
ruleList.add(rule2);
picOperations.setRules(ruleList);

imageReq.setPicOperations(picOperations);

CIUploadResult result = cosClient.processImage(imageReq);
result.getProcessResults();
result.getOriginalInfo();

try {
    CIUploadResult ciUploadResult = cosClient.processImage(imageReq);
    System.out.println(ciUploadResult.getOriginalInfo().getEtag());
    for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
        System.out.println(ciObject.getLocation());
        System.out.println(ciObject.getEtag());
    }
} catch (CosServiceException e) {
    e.printStackTrace();
} catch (CosClientException e) {
    e.printStackTrace();
}

Previous Topic: Basic Image ProcessingNext Topic: Image Advanced Compression

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