阿里人脸识别接口

最近研究了一下阿里的人脸识别功能，只是调用阿里提供的接口返回数据给我们就OK了。
详细文档可参考阿里的api  阿里人脸识别api

人脸比对的方法

直接上代码吧：

package com.guoxin.common.test;

import sun.misc.BASE64Encoder;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

//@SuppressWarnings("restriction")
public class FaceDemoVerify {
    private final static Logger logger = LoggerFactory.getLogger(FaceDemoVerify.class.getName());
    /*
     * 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 url, String body, String ak_id, String ak_secret) throws Exception {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        int statusCode = 200;
        try {
            URL realUrl = new URL(url);
            /*
             * http header 参数
             */
            String method = "POST";
            String accept = "application/json";
            String content_type = "application/json";

//            String content_type = "application/octet-stream";

            String path = realUrl.getFile();
            String date = toGMTString(new Date());
            // 1.对body做MD5+BASE64加密
            String bodyMd5 = MD5Base64(body);
            String stringToSign = method + "
" + accept + "
" + bodyMd5 + "
" + content_type + "
" + date + "
"
                    + path;
            // 2.计算 HMAC-SHA1
            String signature = HMACSha1(stringToSign, ak_secret);
            // 3.得到 authorization header
            String 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);
            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("
Http StatusCode: "+ statusCode + "
ErrorMessage: " + result);
        }
        return result;
    }
    /*
     * GET请求
     */
    public static String sendGet(String url, String ak_id, String ak_secret) throws Exception {
        String result = "";
        BufferedReader in = null;
        int statusCode = 200;
        try {
            URL realUrl = new URL(url);
            /*
             * http header 参数
             */
            String method = "GET";
            String accept = "application/json";
            String content_type = "application/json";

//            String content_type = "application/octet-stream";
            String path = realUrl.getFile();
            String date = toGMTString(new Date());
            // 1.对body做MD5+BASE64加密
            // String bodyMd5 = MD5Base64(body);
            String stringToSign = method + "
" + accept + "
" + "" + "
" + content_type + "
" + date + "
" + path;
            // 2.计算 HMAC-SHA1
            String signature = HMACSha1(stringToSign, ak_secret);
            // 3.得到 authorization header
            String authHeader = "Dataplus " + ak_id + ":" + signature;
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", accept);
            connection.setRequestProperty("content-type", content_type);
            connection.setRequestProperty("date", date);
            connection.setRequestProperty("Authorization", authHeader);
            connection.setRequestProperty("Connection", "keep-alive");
            // 建立实际的连接
            connection.connect();
            // 定义 BufferedReader输入流来读取URL的响应
            statusCode = ((HttpURLConnection)connection).getResponseCode();
            if(statusCode != 200) {
                in = new BufferedReader(new InputStreamReader(((HttpURLConnection)connection).getErrorStream()));
            } else {
                in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            }
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        if (statusCode != 200) {
            throw new IOException("
Http StatusCode: "+ statusCode + "
ErrorMessage: " + result);
        }
        return result;
    }
    public static void main(String[] args) throws Exception {
        // 发送POST请求示例
        String ak_id = "L.............BL"; //用户ak
        String ak_secret = "7W..................4EPW"; // 用户ak_secret
        String url = "https://dtplus-cn-shanghai.data.aliyuncs.com/face/verify";

        //上传本地图片
        // Request body
        String pic_path = "C:\Users\TEST\1.jpg";//本地图片的路径
        String pic_path2 = "C:\Users\TEST\8.jpg";//本地图片的路径 
        
        File picBase64 = new File(pic_path);
        File picBase642 = new File(pic_path2);
        String pic = encodeImageToBase64(picBase64);
        String pic2 = encodeImageToBase64(picBase642);
//        String pic = encodeImageToBase64(pic_path);
//        String pic2 = encodeImageToBase64(pic_path2);
        //提出base64编码的换行符问题
        String data = pic.replaceAll("[\s*	

]", "");
        String data2 = pic2.replaceAll("[\s*	

]", "");
        data = "'" + data + "'";
        data2 = "'" + data2 + "'";
        String body = "{"type":1,
" +
                ""content_1":"+data+",
" +
                ""content_2":"+data2+"
" +
                "}";

        String re = sendPost(url, body, ak_id, ak_secret);
        System.out.println("response body:" + re);
        
        getJsonData(re);
    }

    /**
     * 将本地图片编码为base64
     *
     * @param file
     * @return
     * @throws Exception
     */
    public static String encodeImageToBase64(File file) throws Exception {
        //将图片文件转化为字节数组字符串，并对其进行Base64编码处理
//        loggerger.info("图片的路径为:" + file.getAbsolutePath());
        InputStream in = null;
        byte[] data = null;
        //读取图片字节数组
        try {
            in = new FileInputStream(file);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception("图片上传失败,请联系客服!");
        }
        //对字节数组Base64编码
        BASE64Encoder encoder = new BASE64Encoder();
        String base64 = encoder.encode(data);
        return base64;//返回Base64编码过的字节数组字符串
    }
    
    /**
     * 将网络图片编码为base64
     *
     * @param url
     * @return
     * @throws BusinessException
     */
    public static String encodeImageToBase64(URL url) throws Exception {
        //将图片文件转化为字节数组字符串，并对其进行Base64编码处理
        logger.info("图片的路径为:" + url.toString());
        //打开链接
        HttpURLConnection conn = null;
        try {
            conn = (HttpURLConnection) url.openConnection();
            //设置请求方式为"GET"
            conn.setRequestMethod("GET");
            //超时响应时间为5秒
            conn.setConnectTimeout(5 * 1000);
            //通过输入流获取图片数据
            InputStream inStream = conn.getInputStream();
            //得到图片的二进制数据，以二进制封装得到数据，具有通用性
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            //创建一个Buffer字符串
            byte[] buffer = new byte[1024];
            //每次读取的字符串长度，如果为-1，代表全部读取完毕
            int len = 0;
            //使用一个输入流从buffer里把数据读取出来
            while ((len = inStream.read(buffer)) != -1) {
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
                outStream.write(buffer, 0, len);
            }
            //关闭输入流
            inStream.close();
            byte[] data = outStream.toByteArray();
            //对字节数组Base64编码
            BASE64Encoder encoder = new BASE64Encoder();
            String base64 = encoder.encode(data);
//            logger.info("网络文件[{}]编码成base64字符串:[{}]", url.toString(), base64);
            return base64;//返回Base64编码过的字节数组字符串
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception("图片上传失败,请联系客服!");
        }
    }

    
    public static void getJsonData(String re){
//        String s = "{"confidence":80.6434326171875,"thresholds":[61.0,69.0,75.0],"rectA":[92,50,74,87],"rectB":[171,101,118,137],"errno":0,"request_id":"754af075-1d6b-4cb0-a709-7015eac53a7c"}";
        JSONObject jsonObj = JSON.parseObject(re);
        
        String confidence = jsonObj.getString("confidence");
        System.out.println(confidence);
    }
}

选择两本地照片或者网络，经过base64编码处理，作为两个参数传入调用，人脸比对接口，返回数据。

结果 如下 

{"confidence":80.6434326171875,"thresholds":[61.0,69.0,75.0],"rectA":[92,50,74,87],"rectB":[171,101,118,137],"errno":0,"request_id":"754af075-1d6b-4cb0-a709-7015eac53a7c"}

confidence值即为比对结果的分数，分值越大两张脸相似度高。