1
条回答
写回答
写回答
-
调用视频点播服务接口，是向视频点播服务端发送HTTP请求（可通过HTTP或HTTPS通道发送），并获取响应结果的过程。视频点播服务端接收到用户请求后，对请求进行身份验证和参数验证，验证成功后，根据请求的指定参数提交或完成相应操作，并把处理结果以HTTP响应的形式返回给调用者。
以下Java示例代码演示了如何添加公共参数和私有参数、如何用请求参数构造规范化请求字符串、如何构造StringToSign字符串，以及如何获得OpenAPI地址，最终以Get方式发送Http请求，获取相应的响应结果。如果您需要使用以下示例，请替换示例中的必选参数及私有参数。
添加jar包依赖 注意：使用httpclient get请求 <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.1</version> </dependency> JAVA代码 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<>(); // 视频ID privateParams.put("VideoId","5aed81b74ba84920be578cdfe004af4b"); // API名称 privateParams.put("Action", "GetVideoPlayAuth"); 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<>(); 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> { @Override 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); } }最终得到URL：
http://vod.cn-shanghai.aliyuncs.com?Signature=UI%2FwKfuvTtphzCKHwPhP0ErtLnc%3D&SignatureVersion=1.0&Action=GetVideoPlayAuth&Format=JSON&VideoId=68a4d2629a339db3207963ac073a88cd&SignatureNonce=578a50c1-280d-4a34-bffc-e06aa6b2df76&Version=2017-03-21&AccessKeyId=testId&SignatureMethod=HMAC-SHA1&Timestamp=2017-03-29T12%3A09%3A11Z通过HTTP请求的方式向上述URL地址发送HTTP请求，得到响应结果，此处以JSON格式为例：
{ "RequestId": "25818875-5F78-4A13-BEF6-D7393642CA58", "VideoMeta": { "VideoId": "93ab850b4f6f44eab54b6e91d24d81d4", "Title": "阿里云VOD", "Duration": 135.6, "CoverURL": "https://image.example.com/sample.jpg", "Status": "Normal" }, "PlayAuth": "sstyYuew678999ew90000000xtt7TYUh" }2020-03-30 12:08:31赞同 展开评论 打赏
版权声明：本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。
相关问答
