基于对阿里的信任购买了阿里的人脸比对服，结果测试了好久，个人将阿里提供的demo进行了一下修改
阿里提供的demo：API校验规范
不知道为什么我用他提供的这个url（ String url = "https://shujuapi.aliyun.com/face/verify";）无法调用接口，一直报错403，无奈，最终提交工单客服给了我另一个接口https://dtplus-cn-shanghai.data.aliyuncs.com/face/verify，我是真的没找到这个借口啊！！！！
下面是我个人封装的一个人脸比对的调用，基于阿里提供的demo之上：
public class FaceUtil {private static final String ak_id = "*****************";private static final String ak_secret = "******************************";private static final String url = "https://dtplus-cn-shanghai.data.aliyuncs.com/face/verify";/* * 计算MD5+BASE64 */public static String MD5Base64(String s) {if (s == null)return null;String encodeStr = "";byte[] utfBytes = s.getBytes();MessageDigest mdTemp;try {mdTemp = MessageDigest.getInstance("MD5");mdTemp.update(utfBytes);byte[] md5Bytes = mdTemp.digest();BASE64Encoder b64Encoder = new BASE64Encoder();encodeStr = b64Encoder.encode(md5Bytes);} catch (Exception e) {throw new Error("Failed to generate MD5 : " + e.getMessage());}return encodeStr;}/* * 计算 HMAC-SHA1 */public static String HMACSha1(String data, String key) {String result;try {SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");Mac mac = Mac.getInstance("HmacSHA1");mac.init(signingKey);byte[] rawHmac = mac.doFinal(data.getBytes());result = (new BASE64Encoder()).encode(rawHmac);} catch (Exception e) {throw new Error("Failed to generate HMAC : " + e.getMessage());}return result;}/* * 等同于javaScript中的 new Date().toUTCString(); */public static String toGMTString(Date date) {SimpleDateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z", Locale.UK);df.setTimeZone(new java.util.SimpleTimeZone(0, "GMT"));return df.format(date);}/* * 发送POST请求 */public static String sendPost(String url1, String url2) throws Exception {String body = "{"image_url_1": "" + url1 + "", "image_url_2":"" + url2 + ""}";PrintWriter out = null;BufferedReader in = null;String result = "";int statusCode = 200;try {URL realUrl = new URL(url);/* * http header 参数 */String method = "POST";// 返回值类型String accept = "application/json";// 请求内容类型String content_type = "application/json";String path = realUrl.getFile();// GMT时间String date = toGMTString(new Date());// 1.对body做MD5+BASE64加密String bodyMd5 = MD5Base64(body);String stringToSign = method + "n" + accept + "n" + bodyMd5 + "n" + content_type + "n" + date + "n"+ path;// 2.计算 HMAC-SHA1String signature = HMACSha1(stringToSign, ak_secret);// 3.得到 authorization headerString authHeader = "Dataplus " + ak_id + ":" + signature;// 打开和URL之间的连接URLConnection conn = realUrl.openConnection();// 设置通用的请求属性conn.setRequestProperty("Accept", accept);conn.setRequestProperty("Content-type", content_type);conn.setRequestProperty("Date", date);// 认证信息conn.setRequestProperty("Authorization", authHeader);// 发送POST请求必须设置如下两行conn.setDoOutput(true);conn.setDoInput(true);// 获取URLConnection对象对应的输出流out = new PrintWriter(conn.getOutputStream());// 发送请求参数out.print(body);// flush输出流的缓冲out.flush();// 定义BufferedReader输入流来读取URL的响应statusCode = ((HttpURLConnection) conn).getResponseCode();if (statusCode != 200) {in = new BufferedReader(new InputStreamReader(((HttpURLConnection) conn).getErrorStream()));} else {in = new BufferedReader(new InputStreamReader(conn.getInputStream()));}String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {e.printStackTrace();} finally {try {if (out != null) {out.close();}if (in != null) {in.close();}} catch (IOException ex) {ex.printStackTrace();}}if (statusCode != 200) {throw new IOException("nHttp StatusCode: " + statusCode + "nErrorMessage: " + result);}return result;}public static void main(String[] args) throws Exception {String url1 = "http://112.86.129.73:2000/upload/001.jpg";String url2 = "http://112.86.129.73:2000/upload/003.jpg";String response = sendPost(url1, url2);JSONObject strj = new JSONObject(response);System.out.println(strj.toString());System.out.println(strj.getDouble("confidence"));}}
Access_Id和Access_secret改成自己的，这样的话就只需要将两张图片的url放上来就可以了，返回值阿里的API文档中有解释