How to use Java to connect to Alibaba Cloud CDN: achieve acceleration and cache control

How to use Java to connect to Alibaba Cloud CDN: achieve acceleration and cache control

Alibaba Cloud CDN is a content distribution network service that can help websites provide fast page loading speed and stable content distribution. By using Java to connect to Alibaba Cloud CDN, you can better control caching and accelerate website content transmission. This article will introduce how to use Java to connect to Alibaba Cloud CDN and show some code examples.

1. Introduce dependencies

First, introduce the Java SDK dependencies of Alibaba Cloud CDN into the Java project. You can add the following dependencies in the Maven or Gradle configuration file:

Maven:

<dependency>
    <groupId>com.aliyun</groupId>
    <artifactId>aliyun-java-sdk-cdn</artifactId>
    <version>3.0.2</version>
</dependency>

Gradle:

compile 'com.aliyun:aliyun-java-sdk-cdn:3.0.2'

2. Create CDN client

Before using the API of Alibaba Cloud CDN, you need to create a CDN client. It can be created according to the following code example:

import com.aliyuncs.profile.DefaultProfile;
import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.IAcsClient;
import com.aliyuncs.cdn.model.v20180510.*;
import com.aliyuncs.profile.IClientProfile;

public class CDNClientUtil {

    private static final String REGION_ID = "<您的Region ID>";
    private static final String ACCESS_KEY = "<您的Access Key>";
    private static final String ACCESS_SECRET = "<您的Access Secret>";

    public static IAcsClient getClient() throws ClientException {
        IClientProfile profile = DefaultProfile.getProfile(REGION_ID, ACCESS_KEY, ACCESS_SECRET);
        return new DefaultAcsClient(profile);
    }
}

Please note that replace REGION_ID, ACCESS_KEY and ACCESS_SECRET with your own Alibaba Cloud CDN account information.

3. Set caching rules

Alibaba Cloud CDN can control the caching behavior of specific files by setting caching rules. You can set the cache rules according to the following code example:

public class CDNUtil {

    public static void setCacheRule(String domain, String path, String pattern, int ttl) throws ClientException {
        IAcsClient client = CDNClientUtil.getClient();

        SetDomainCacheExpiredConfigRequest request = new SetDomainCacheExpiredConfigRequest();
        request.setDomainName(domain);
        request.setCacheContent(pattern);
        request.setTTL(ttl);

        client.getAcsResponse(request);
        System.out.println("Cache rule has been set for " + domain + path);
    }
}

where, domain is the domain name to set the cache rules, path is the specific path to set the cache rules , pattern is the type of cache, which can be file (file-level cache) or directory (directory-level cache), ttl is cache validity period.

4. Refresh the file

When the file content of the website changes, the CDN server can re-obtain the latest file content by refreshing the file. You can refresh the file according to the following code example:

public class CDNUtil {

    public static void refreshFile(String domain, String path) throws ClientException {
        IAcsClient client = CDNClientUtil.getClient();

        RefreshObjectCachesRequest request = new RefreshObjectCachesRequest();
        request.setObjectPath(path);
        request.setObjectType("File");

        client.getAcsResponse(request);
        System.out.println("File " + path + " has been refreshed for " + domain);
    }
}

where domain is the domain name of the file to be refreshed, and path is the file path to be refreshed.

The above are the basic steps and sample code for using Java to connect to Alibaba Cloud CDN. By connecting to Alibaba Cloud CDN, we can better control caching and improve the loading speed of the website, improving user experience. Hope this article helps you!

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