ApsaraVideo VOD:Preview videos

import com.alibaba.fastjson.JSONObject;
import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.profile.DefaultProfile;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.vod.model.v20170321.GetPlayInfoRequest;
import com.aliyuncs.vod.model.v20170321.GetPlayInfoResponse;

/**
 * @date 2021/12/30
 */
public class VodPreviewTest {
    public static void main(String[] args) throws ClientException {
        // Specify the region where ApsaraVideo VOD is activated. For more information, see ApsaraVideo VOD regions.
        String regionId = "cn-shanghai";
        // An AccessKey pair of an Alibaba Cloud account has permissions to call all API operations. We recommend that you use a RAM user to call API operations or perform routine O&M.
        // We strongly recommend that you do not hard-code the AccessKey ID and AccessKey secret in your project code. Otherwise, the AccessKey pair may be leaked and the security of all resources in your account may be compromised.
        // In this example, the AccessKey pair is obtained from environment variables. Before you run the sample code, configure the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variables.
        // Your AccessKey ID.
        String accessKeyId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
        // Your AccessKey secret.
        String accessKeySecret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
        // The video ID. Example: 533606af570e4db4961248d0978b****. If you upload a video in the ApsaraVideo VOD console, you can log on to the console and choose Media Library > Audio/Video to view the video ID. If you upload a video by calling the CreateUploadVideo operation, the value of the VideoId parameter in the response is the video ID.
        String videoId = "<your videoId>";
        DefaultAcsClient client = InitVodClient(regionId, accessKeyId, accessKeySecret);
        GetPlayInfoResponse response = null;
        try {
            response = getPlayInfo(client, videoId);
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println("response = " + JSONObject.toJSONString(response));

    }

    /**
     * Initialize the client.
     *
     * @param regionId
     * @param accessKeyId
     * @param accessKeySecret
     * @return
     * @throws ClientException
     */
    public static DefaultAcsClient InitVodClient(String regionId, String accessKeyId, String accessKeySecret) throws ClientException {
        DefaultProfile profile = DefaultProfile.getProfile(regionId, accessKeyId, accessKeySecret);
        DefaultAcsClient client = new DefaultAcsClient(profile);
        return client;
    }

    /**
     * Obtain the video playback URL.
     *
     * @param client
     * @param videoId
     * @return
     * @throws Exception
     */
    public static GetPlayInfoResponse getPlayInfo(DefaultAcsClient client, String videoId) throws Exception {
        GetPlayInfoRequest request = new GetPlayInfoRequest();
        request.setVideoId(videoId);
        // The validity period of the URL. Unit: seconds. If you do not set this parameter, the default value 3600 is used.
        request.setAuthTimeout(3600L);
        request.setFormats("mp4");
        JSONObject playConfig = new JSONObject();
        // The preview duration. Unit: seconds. The minimum value is 1.
        playConfig.put("PreviewTime", "30");
        request.setPlayConfig(playConfig.toJSONString());
        return client.getAcsResponse(request);
    }
}
                

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.4</version>
</dependency>

    import java.util.UUID;
    import java.net.URL;
    import org.apache.commons.lang3.StringUtils;
    private String generateRand() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }
    private String md5(String str) {
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            md5.update(str.getBytes("UTF-8"));
            return bytesToHex(md5.digest());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public String genAuthKey(String object, String privateKey, Long expireTime, Long previewTime) {
        String rand = "0";
        String uid = "0";
        if (StringUtils.isBlank(privateKey)) {
            return "";
        }
        rand = generateRand();
        long timestamp = System.currentTimeMillis() / 1000 + (expireTime == null ? 0 : expireTime);
        String authStr = timestamp + "-" + rand + "-" + uid;
        String md5Str = object + "-" + authStr + "-" + privateKey;
        if(previewTime!=0)
            md5Str = md5Str + "-" + previewTime;
        String auth_key = authStr + "-" + this.md5(md5Str);
        return auth_key;
    }

    public void previewTest() throws Exception {
        try {
            String key = "<Your PrivateKey>";// The primary or secondary key that you configured in the console. For more information about how to obtain the key, see Enable the video preview feature.
            String fileUrl = "<Your File URL>";// The file URL. Example: http://example.aliyundoc.com/test/bee21427ca3346848835c1bd786054c5-19bd8528c1d51576cd726cf86471ca0****.mp4
            URL url = new URL(fileUrl);
            String file = url.getFile();
            Long previewTime = 120L;// The preview duration.
            Long expireTime = 1800L;
            String auth_key =genAuthKey(file, key, expireTime, previewTime);
            fileUrl = fileUrl + "?auth_key=" + auth_key;
            if(previewTime != 0)
                fileUrl = fileUrl + "&end=" + previewTime;
            System.out.println(fileUrl);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }