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 {
        //請(qǐng)根據(jù)點(diǎn)播服務(wù)接入?yún)^(qū)域填寫，更多信息，請(qǐng)參見(jiàn)點(diǎn)播地域標(biāo)識(shí)。
        String regionId = "cn-shanghai";
        // 阿里云賬號(hào)AccessKey擁有所有API的訪問(wèn)權(quán)限，建議您使用RAM用戶進(jìn)行API訪問(wèn)或日常運(yùn)維。
        // 強(qiáng)烈建議不要把AccessKey ID和AccessKey Secret保存到工程代碼里，否則可能導(dǎo)致AccessKey泄露，威脅您賬號(hào)下所有資源的安全。
        // 本示例通過(guò)從環(huán)境變量中讀取AccessKey，來(lái)實(shí)現(xiàn)API訪問(wèn)的身份驗(yàn)證。運(yùn)行代碼示例前，請(qǐng)配置環(huán)境變量ALIBABA_CLOUD_ACCESS_KEY_ID和ALIBABA_CLOUD_ACCESS_KEY_SECRET。
        //您的AccessKeyId
        String accessKeyId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
        //您的AccessKeySecret
        String accessKeySecret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
        //視頻ID。示例：533606af570e4db4961248d0978b****。通過(guò)控制臺(tái)上傳的視頻，可登錄點(diǎn)播控制臺(tái)，選擇媒資庫(kù) > 音/視頻查看視頻ID。通過(guò)CreateUploadVideo接口上傳的視頻，視頻ID為返回參數(shù)VideoId的值。
        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));

    }

    /**
     * 初始化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;
    }

    /**
     * 獲取視頻播放地址
     *
     * @param client
     * @param videoId
     * @return
     * @throws Exception
     */
    public static GetPlayInfoResponse getPlayInfo(DefaultAcsClient client, String videoId) throws Exception {
        GetPlayInfoRequest request = new GetPlayInfoRequest();
        request.setVideoId(videoId);
        //設(shè)置過(guò)期時(shí)間，單位秒，不設(shè)置，默認(rèn)3600s
        request.setAuthTimeout(3600L);
        request.setFormats("mp4");
        JSONObject playConfig = new JSONObject();
        //視頻點(diǎn)播試看時(shí)長(zhǎng)，單位為秒。最小值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>";//控制臺(tái)配置的主Key或備Key。如何獲取請(qǐng)參見(jiàn)開(kāi)啟試看功能。
            String fileUrl = "<Your File URL>";//文件地址，示例：http://example.aliyundoc.com/test/bee21427ca3346848835c1bd786054c5-19bd8528c1d51576cd726cf86471ca0****.mp4
            URL url = new URL(fileUrl);
            String file = url.getFile();
            Long previewTime = 120L;//試看時(shí)長(zhǎng)。
            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();
        }
    }