获取播放URL#

1. 开通阿里云点播服务#

• 开始使用视频点播

根据上面文档的提示上传视频

2.获取AccessKey#

登录阿里云后，鼠标移动到用户头像点击AccessKey -> 新建

3.使用代码获取播放URL#

须通过HTTP GET请求并传递相应参数才能获取到播放URL，并且参数需要计算，所以使用代码进行获取比较方便。

• 官方调用示例

3.1 说明#

• access_key_id和access_key_secret为必须项
• Action的值根据需求改变，此处使用GetPlayInfo（获取播放URL）

Key	Value	Meaning
Action	GetPlayInfo	获取播放URL
Action	GetVideoPlayAuth

• 下面是官方代码（修改了Action的值）

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.1</version>
</dependency>

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import sun.misc.BASE64Encoder;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLEncoder;
import java.security.SignatureException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.logging.Logger;
/**
 * 视频点播OpenAPI调用示例
 * 以GetVideoPlayAuth接口为例，其他接口请替换相应接口名称及私有参数
 */
public class Main {
    //账号AccessKey信息请填写(必选)
    private static String access_key_id = "";
    //账号AccessKey信息请填写(必选)
    private static String access_key_secret = "";
    //STS临时授权方式访问时该参数为必选，使用主账号AccessKey和RAM子账号AccessKey不需要填写
    private static String security_token = "";
    //以下参数不需要修改
    private final static String VOD_DOMAIN = "http://vod.cn-shanghai.aliyuncs.com";
    private final static String ISO8601_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss'Z'";
    private final static String HTTP_METHOD = "GET";
    private final static String HMAC_SHA1_ALGORITHM = "HmacSHA1";
    private final static String UTF_8 = "utf-8";
    private final static Logger LOG = Logger.getLogger(Main.class.getName());

public static void main(String[] args) throws Exception {
    //生成私有参数，不同API需要修改
    Map<String, String> privateParams = generatePrivateParamters();
    //生成公共参数，不需要修改
    Map<String, String> publicParams = generatePublicParamters();
    //生成OpenAPI地址，不需要修改
    String URL = generateOpenAPIURL(publicParams, privateParams);
    //发送HTTP GET 请求
    httpGet(URL);
}
  /**
    * 生成视频点播OpenAPI私有参数
    * 不同API需要修改此方法中的参数
    * @return
   */
private static Map<String, String> generatePrivateParamters() {
    // 接口私有参数列表, 不同API请替换相应参数
    Map<String, String> privateParams = new HashMap<String, String>();
    // 视频ID
    privateParams.put("VideoId","24c5334a35a841f099456f2b39108b8e");
    // API名称
    privateParams.put("Action", "GetPlayInfo");
    return privateParams;
}
  /**
   * 生成视频点播OpenAPI公共参数
   * 不需要修改
   * @return
   */
private static Map<String, String> generatePublicParamters() {
    Map<String, String> publicParams = new HashMap<String, String>();
    publicParams.put("Format", "JSON");
    publicParams.put("Version", "2017-03-21");
    publicParams.put("AccessKeyId", access_key_id);
    publicParams.put("SignatureMethod", "HMAC-SHA1");
    publicParams.put("Timestamp", generateTimestamp());
    publicParams.put("SignatureVersion", "1.0");
    publicParams.put("SignatureNonce", generateRandom());
    if (security_token != null && security_token.length() > 0) {
        publicParams.put("SecurityToken", security_token);
    }
    return publicParams;
}
 /**
   * 生成OpenAPI地址
   * @param privateParams
   * @return
   * @throws Exception
   */
private static String generateOpenAPIURL(Map<String, String> publicParams, Map<String, String> privateParams) {
    return generateURL(VOD_DOMAIN, HTTP_METHOD, publicParams, privateParams);
}
/**
  * @param domain        请求地址
  * @param httpMethod    HTTP请求方式GET，POST等
  * @param publicParams  公共参数
  * @param privateParams 接口的私有参数
  * @return 最后的url
 */
private static String generateURL(String domain, String httpMethod, Map<String, String> publicParams, Map<String, String> privateParams) {
    List<String> allEncodeParams = getAllParams(publicParams, privateParams);
    String cqsString = getCQS(allEncodeParams);
    out("CanonicalizedQueryString = " + cqsString);
    String stringToSign = httpMethod + "&" + percentEncode("/") + "&" + percentEncode(cqsString);
    out("StringtoSign = " + stringToSign);
    String signature = hmacSHA1Signature(access_key_secret, stringToSign);
    out("Signature = " + signature);
    return domain + "?" + cqsString + "&" + percentEncode("Signature") + "=" + percentEncode(signature);
}
private static List<String> getAllParams(Map<String, String> publicParams, Map<String, String> privateParams) {
  List<String> encodeParams = new ArrayList<String>();
    if (publicParams != null) {
        for (String key : publicParams.keySet()) {
              String value = publicParams.get(key);
            //将参数和值都urlEncode一下。
            String encodeKey = percentEncode(key);
            String encodeVal = percentEncode(value);
            encodeParams.add(encodeKey + "=" + encodeVal);
        }
    }
    if (privateParams != null) {
        for (String key : privateParams.keySet()) {
            String value = privateParams.get(key);
            //将参数和值都urlEncode一下。
            String encodeKey = percentEncode(key);
            String encodeVal = percentEncode(value);
            encodeParams.add(encodeKey + "=" + encodeVal);
        }
    }
    return encodeParams;
}
/**
* 参数urlEncode
*
* @param value
* @return
*/
private static String percentEncode(String value) {
    try {
        String urlEncodeOrignStr = URLEncoder.encode(value, "UTF-8");
        String plusReplaced = urlEncodeOrignStr.replace("+", "%20");
        String starReplaced = plusReplaced.replace("*", "%2A");
        String waveReplaced = starReplaced.replace("%7E", "~");
        return waveReplaced;
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return value;
}
/**
* 获取CQS 的字符串
*
* @param allParams
* @return
*/
private static String getCQS(List<String> allParams) {
    ParamsComparator paramsComparator = new ParamsComparator();
    Collections.sort(allParams, paramsComparator);
    String cqString = "";
    for (int i = 0; i < allParams.size(); i++) {
        cqString += allParams.get(i);
        if (i != allParams.size() - 1) {
            cqString += "&";
        }
    }
    return cqString;
}
private static class ParamsComparator implements Comparator<String> {
    public int compare(String lhs, String rhs) {
        return lhs.compareTo(rhs);
    }
}
private static String hmacSHA1Signature(String accessKeySecret, String stringtoSign) {
    try {
        String key = accessKeySecret + "&";
        try {
            SecretKeySpec signKey = new SecretKeySpec(key.getBytes(), HMAC_SHA1_ALGORITHM);
            Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
            mac.init(signKey);
            byte[] rawHmac = mac.doFinal(stringtoSign.getBytes());
            //按照Base64 编码规则把上面的 HMAC 值编码成字符串，即得到签名值（Signature）
            return new String(new BASE64Encoder().encode(rawHmac));
            } catch (Exception e) {
            throw new SignatureException("Failed to generate HMAC : " + e.getMessage());
        }
    } catch (SignatureException e) {
        e.printStackTrace();
    }
    return "";
}
/**
* 生成随机数
*
* @return
*/
private static String generateRandom() {
    String signatureNonce = UUID.randomUUID().toString();
    return signatureNonce;
}
/**
* 生成当前UTC时间戳
*
* @return
*/
public static String generateTimestamp() {
    Date date = new Date(System.currentTimeMillis());
    SimpleDateFormat df = new SimpleDateFormat(ISO8601_DATE_FORMAT);
    df.setTimeZone(new SimpleTimeZone(0, "GMT"));
    return df.format(date);
}
private static String httpGet(String url) throws Exception {
    CloseableHttpClient httpClient = null;
    try {
        httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet();
        httpGet.setURI(new URI(url));
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(3000)
                .setSocketTimeout(3000)
                .build();
        httpGet.setConfig(requestConfig);
        HttpResponse result = httpClient.execute(httpGet);
        String str;
        try {
            /**读取服务器返回过来的json字符串数据**/
            str = EntityUtils.toString(result.getEntity());
            EntityUtils.consume(result.getEntity());
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
        out(str);
        // 这里可以解析视频云点播服务端的响应结果
        return str;
    } catch (URISyntaxException e) {
        e.printStackTrace();
        throw e;
    } catch (ClientProtocolException e) {
        e.printStackTrace();
        throw e;
    } catch (IOException e) {
        e.printStackTrace();
        throw e;
    } finally {
        try {
            if (httpClient != null)
                httpClient.close();
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }
}
private static void out(String newLine) {
    System.out.println(newLine);
    LOG.info(newLine);
}
}