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How do I use ECS SDK after I have prepared AccessKey? I believe that many inexperienced people are at a loss about this, so this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Example of using ECS SDK

The file name of a new version of SDK usually starts with aliyun-XXXX-sdk, followed by a product name such as ECS, and a package name such as aliyun-java-sdk-ecs. There is a core package aliyun-java-sdk-core, which encapsulates some classes that are used by the SDK of all products, such as IClientProfile class, IAcsClient class, exception class, and so on. Product-related classes are packaged into Jar packages with different names on a per-product basis.

prerequisite

You need to have your AccessKey ready for output to the creation Profile.

Example of using Java SDK

Take DescribeImages, a method used by ECS Java SDK to query available mirror resources, as an example to introduce the complete process used by SDK, in which two classes IClientProfile and IAcsClient are included in the aliyun-java-sdk-core package, and the other classes are included in the aliyun-java-sdk-ecs package.

Create a Profile. Generate the object profile of IClientProfile, which stores AccessKeyID and AccessKeySecret and default region information, such as cn-hangzhou in the example. For more information about regions, please see regions and availability zones.

IClientProfile profile = DefaultProfile.getProfile ("cn-hangzhou", ak, aks); # ak is your AccessKey,aks and your AccessKeySecret

Create a Client. The object client of IAcsClient is generated from the IClientProfile class, and the subsequent response needs to be obtained from IClientProfile.

IAcsClient client = new DefaultAcsClient (profile)

Create a Request. Create a Request for the corresponding method. The naming rule of the class is generally API's method name plus "Request". If the API method that gets the image list is called DescribeImages, then the corresponding request class name is DescribeImagesRequest. Use the constructor to generate a default class describe directly.

DescribeImagesRequest describe = new DescribeImagesRequest ()

Set parameters for Request. After the request class is generated, you need to set the necessary information through the setXxx method of the Request class, that is, the information that must be provided in the API parameter. The parameter provided by the API method of DescribeImages must be RegionId, which can be omitted because the region information is already provided in IClientProfile. Similarly, you can also set other optional parameters through the setXxx method. For example, if you set the image to be queried as a custom image, set the value of ImageOwnerAlias to self. Means to query your custom image.

Describe.setImageOwnerAlias ("self")

After the parameters are set, the response of the corresponding Request is obtained through the IAcsClient object.

DescribeImagesResponse response = client.getAcsResponse (describe)

Get the returned parameter value in Response. You can then call the corresponding getXxx method in response to get the returned parameter value, such as the name of a mirror. Depending on the API method, the returned information may contain multiple layers of information. For example, in the method of obtaining the mirror list, the image in the returned information is represented by a collection, and the information of each mirror is stored in the collection. For Java SDK, the mirror information is stored in a list, and you need to first obtain the collection of Image objects through getImages (). Then get the information of one of the mirrors by traversing and other methods, and then call the getXxx method to get the specific information.

For (Image image:response.getImages ()) {System.out.println (image.getImageId ()); System.out.println (image.getImageName ());

At this point, a complete call is complete.

Considerations for PHP SDK

The analogy of using PHP SDK and Java SDK can be summarized as follows:

Create a Profile.

Create a Client.

Create a Request.

Set parameters for Request.

Use the method corresponding to Client to pass in Request to get Response.

Get the returned parameter value in Response.

Considerations for Python SDK

Use Python SDK to omit the step of creating a Profile, create a Client directly, and then perform the following steps.

After reading the above, have you mastered how to use AccessKey after you have prepared ECS SDK? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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