Learn the docking skills between Java and Alibaba Cloud CDN from scratch

Learn the docking skills between Java and Alibaba Cloud CDN from scratch

Alibaba Cloud CDN (Content Delivery Network) is a network transmission technology that caches data on distributed nodes located around the world. Solutions to increase data access speed. In Java development, docking with Alibaba Cloud CDN can greatly improve website access speed and user experience. This article will introduce how to learn the docking skills between Java and Alibaba Cloud CDN from scratch, and provide some code examples.

First, we need to register an Alibaba Cloud account and activate the CDN service. The process of registering an account and activating the CDN service is explained in detail on the Alibaba Cloud official website, so I won’t go into details here.

1. Introducing Alibaba Cloud CDN Java SDK

In Java development, we can use the Java SDK provided by Alibaba Cloud to achieve docking with CDN. When using Maven to manage project dependencies, we can add the following dependencies in the pom.xml file:

<dependency>
    <groupId>com.aliyun</groupId>
    <artifactId>aliyun-java-sdk-cdn</artifactId>
    <version>3.7.8</version>
</dependency>

If you do not use Maven, you can manually download the SDK and import the SDK jar package into the project.

2. Configure Alibaba Cloud CDN

Before using Alibaba Cloud CDN in the project, we need to perform some configurations. First, obtain the AccessKey ID and AccessKey Secret in the Alibaba Cloud console. Then, create a DefaultAcsClient object in the project and set the AccessKey ID and AccessKey Secret to the client:

import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.profile.DefaultProfile;

DefaultProfile profile = DefaultProfile.getProfile("cn-hangzhou", "<your access key>", "<your access secret>");
DefaultAcsClient client = new DefaultAcsClient(profile);

In the above code, cn-hangzhouIndicates the CDN area, modify it according to the actual situation.

3. Create a CDN domain name

Before connecting to the CDN, you need to create a CDN domain name first. In the Alibaba Cloud console, select "Domain Name Management", then click "Add Domain Name" and configure the domain name according to the prompts on the page.

4. Refresh the cache

In the process of using CDN, we sometimes need to refresh the cache to ensure timely updating of content. Alibaba Cloud CDN provides a refresh interface, which can be called through the following code:

import com.aliyuncs.cdn.model.v20180510.RefreshObjectCachesRequest;
import com.aliyuncs.cdn.model.v20180510.RefreshObjectCachesResponse;

RefreshObjectCachesRequest request = new RefreshObjectCachesRequest();
request.setObjectPath("<your object path>");

try {
    RefreshObjectCachesResponse response = client.getAcsResponse(request);
    // 刷新成功，处理返回结果
} catch (Exception e) {
    // 刷新失败，处理异常情况
}

In the above example code, <your object path> is the object path that needs to be refreshed. You can It can be a single file or a directory. If you need to refresh multiple objects, you can call the refresh interface multiple times.

5. Preload content

In some cases, we need to load content into the CDN cache in advance to improve user access speed. Alibaba Cloud CDN provides a preloading interface, which can be called through the following code:

import com.aliyuncs.cdn.model.v20180510.PushObjectCacheRequest;
import com.aliyuncs.cdn.model.v20180510.PushObjectCacheResponse;

PushObjectCacheRequest request = new PushObjectCacheRequest();
request.setObjectPath("<your object path>");

try {
    PushObjectCacheResponse response = client.getAcsResponse(request);
    // 预加载成功，处理返回结果
} catch (Exception e) {
    // 预加载失败，处理异常情况
}

In the above example code, <your object path> is the object path that needs to be preloaded. Can be a single file or a directory. If you need to preload multiple objects, you can call the preloading interface multiple times.

6. Query the refresh/preload task progress

The refresh/preload task takes a certain amount of time to complete. If you need to query the progress of the task, you can call it through the following code:

import com.aliyuncs.cdn.model.v20180510.DescribeRefreshTasksRequest;
import com.aliyuncs.cdn.model.v20180510.DescribeRefreshTasksResponse;

DescribeRefreshTasksRequest request = new DescribeRefreshTasksRequest();
request.setTaskId("<your task id>");

try {
    DescribeRefreshTasksResponse response = client.getAcsResponse(request);
    // 处理返回结果
} catch (Exception e) {
    // 处理异常情况
}

In the above example code, <your task id> is the ID of the refresh/preload task, you can Obtained by returning the result.

The above are the basic techniques and code examples for using Java to connect with Alibaba Cloud CDN. Through the above steps, we can realize the connection between the Java project and Alibaba Cloud CDN, improving the access speed and user experience of the website. I hope this article will be helpful for you to learn how to connect Java with Alibaba Cloud CDN.

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